ext/kernel/string.c

/*
  +------------------------------------------------------------------------+
  | Zephir Language                                                        |
  +------------------------------------------------------------------------+
  | Copyright (c) 2011-2017 Zephir Team (http://www.zephir-lang.com)       |
  +------------------------------------------------------------------------+
  | This source file is subject to the New BSD License that is bundled     |
  | with this package in the file docs/LICENSE.txt.                        |
  |                                                                        |
  | If you did not receive a copy of the license and are unable to         |
  | obtain it through the world-wide-web, please send an email             |
  | to license@zephir-lang.com so we can send you a copy immediately.      |
  +------------------------------------------------------------------------+
  | Authors: Andres Gutierrez <andres@zephir-lang.com>                     |
  |          Eduar Carvajal <eduar@zephir-lang.com>                        |
  |          Vladimir Kolesnikov <vladimir@extrememember.com>              |
  +------------------------------------------------------------------------+
*/

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <ctype.h>

#include <php.h>
#include "php_ext.h"
#include "php_main.h"

#include <ext/standard/php_smart_str.h>
#include <ext/standard/php_string.h>
#include <ext/standard/php_rand.h>
#include <ext/standard/php_lcg.h>
#include <ext/standard/php_http.h>
#include "ext/standard/base64.h"
#include "ext/standard/md5.h"
#include "ext/standard/crc32.h"
#include "ext/standard/url.h"
#include "ext/standard/html.h"
#include "ext/date/php_date.h"

#ifdef ZEPHIR_USE_PHP_PCRE
#include <ext/pcre/php_pcre.h>
#endif

#ifdef ZEPHIR_USE_PHP_JSON
#include <ext/json/php_json.h>
#endif

#include "kernel/main.h"
#include "kernel/memory.h"
#include "kernel/string.h"
#include "kernel/operators.h"
#include "kernel/fcall.h"

#define PH_RANDOM_ALNUM 0
#define PH_RANDOM_ALPHA 1
#define PH_RANDOM_HEXDEC 2
#define PH_RANDOM_NUMERIC 3
#define PH_RANDOM_NOZERO 4

/**
 * Fast call to php strlen
 */
void zephir_fast_strlen(zval *return_value, zval *str){

	zval copy;
	int use_copy = 0;

	if (Z_TYPE_P(str) != IS_STRING) {
		zend_make_printable_zval(str, &copy, &use_copy);
		if (use_copy) {
			str = &copy;
		}
	}

	ZVAL_LONG(return_value, Z_STRLEN_P(str));

	if (use_copy) {
		zval_dtor(str);
	}
}

/**
 * Fast call to php strlen
 */
int zephir_fast_strlen_ev(zval *str){

	zval copy;
	int use_copy = 0, length;

	if (Z_TYPE_P(str) != IS_STRING) {
		zend_make_printable_zval(str, &copy, &use_copy);
		if (use_copy) {
			str = &copy;
		}
	}

	length = Z_STRLEN_P(str);
	if (use_copy) {
		zval_dtor(str);
	}

	return length;
}

/**
 * Fast call to php strlen
 */
void zephir_fast_strtolower(zval *return_value, zval *str){

	zval copy;
	int use_copy = 0;
	char *lower_str;
	unsigned int length;

	if (Z_TYPE_P(str) != IS_STRING) {
		zend_make_printable_zval(str, &copy, &use_copy);
		if (use_copy) {
			str = &copy;
		}
	}

	length = Z_STRLEN_P(str);
	lower_str = estrndup(Z_STRVAL_P(str), length);
	php_strtolower(lower_str, length);

	if (use_copy) {
		zval_dtor(str);
	}

	ZVAL_STRINGL(return_value, lower_str, length, 0);
}

void zephir_strtolower_inplace(zval *s) {
	if (EXPECTED(Z_TYPE_P(s) == IS_STRING)) {
		php_strtolower(Z_STRVAL_P(s), Z_STRLEN_P(s));
	}
}

/**
 * Fast call to php join  function
 */
void zephir_fast_join(zval *result, zval *glue, zval *pieces TSRMLS_DC) {

	if (Z_TYPE_P(glue) != IS_STRING || Z_TYPE_P(pieces) != IS_ARRAY) {
		ZVAL_NULL(result);
		zend_error(E_WARNING, "Invalid arguments supplied for join()");
		return;
	}

	php_implode(glue, pieces, result TSRMLS_CC);
}

/**
 * Appends to a smart_str a printable version of a zval
 */
void zephir_append_printable_zval(smart_str *implstr, zval **tmp TSRMLS_DC) {

	zval tmp_val;
	unsigned int str_len;

	switch (Z_TYPE_PP(tmp)) {
		case IS_STRING:
			smart_str_appendl(implstr, Z_STRVAL_PP(tmp), Z_STRLEN_PP(tmp));
			break;

		case IS_LONG:
			smart_str_append_long(implstr, Z_LVAL_PP(tmp));
			break;

		case IS_BOOL:
			if (Z_LVAL_PP(tmp) == 1) {
				smart_str_appendl(implstr, "1", sizeof("1") - 1);
			}
			break;

		case IS_NULL:
			break;

		case IS_DOUBLE: {
			char *stmp;
			str_len = spprintf(&stmp, 0, "%.*G", (int) EG(precision), Z_DVAL_PP(tmp));
			smart_str_appendl(implstr, stmp, str_len);
			efree(stmp);
		}
			break;

		case IS_OBJECT: {
			int copy;
			zval expr;
			zend_make_printable_zval(*tmp, &expr, &copy);
			smart_str_appendl(implstr, Z_STRVAL(expr), Z_STRLEN(expr));
			if (copy) {
				zval_dtor(&expr);
			}
		}
			break;

		default:
			tmp_val = **tmp;
			zval_copy_ctor(&tmp_val);
			convert_to_string(&tmp_val);
			smart_str_appendl(implstr, Z_STRVAL(tmp_val), Z_STRLEN(tmp_val));
			zval_dtor(&tmp_val);
			break;
	}
}

/**
 * Fast join function
 * This function is an adaption of the php_implode function
 *
 */
void zephir_fast_join_str(zval *return_value, char *glue, unsigned int glue_length, zval *pieces TSRMLS_DC) {

	zval         **tmp;
	HashTable      *arr;
	HashPosition   pos;
	smart_str      implstr = {0};
	unsigned int   numelems, i = 0;

	if (Z_TYPE_P(pieces) != IS_ARRAY) {
		php_error_docref(NULL TSRMLS_CC, E_WARNING, "Invalid arguments supplied for fast_join()");
		RETURN_EMPTY_STRING();
	}

	arr = Z_ARRVAL_P(pieces);
	numelems = zend_hash_num_elements(arr);

	if (numelems == 0) {
		RETURN_EMPTY_STRING();
	}

	zend_hash_internal_pointer_reset_ex(arr, &pos);

	while (zend_hash_get_current_data_ex(arr, (void **) &tmp, &pos) == SUCCESS) {
		zephir_append_printable_zval(&implstr, tmp TSRMLS_CC);
		if (++i != numelems) {
			smart_str_appendl(&implstr, glue, glue_length);
		}
		zend_hash_move_forward_ex(arr, &pos);
	}
	smart_str_0(&implstr);

	if (implstr.len) {
		RETURN_STRINGL(implstr.c, implstr.len, 0);
	} else {
		smart_str_free(&implstr);
		RETURN_EMPTY_STRING();
	}
}

/**
 * Convert dash/underscored texts returning camelized
 * (an optional delimiter can be specified as character-mask as for ltrim)
 */
void zephir_camelize(zval *return_value, const zval *str, const zval *delimiter) {

	int i, len, delim_len, pre_del = 1;
	smart_str camelize_str = {0};
	char *marker, ch, *delim;

	if (UNEXPECTED(Z_TYPE_P(str) != IS_STRING)) {
		zend_error(E_WARNING, "Invalid arguments supplied for camelize()");
		RETURN_EMPTY_STRING();
	}

	if (delimiter == NULL || Z_TYPE_P(delimiter) == IS_NULL) {
		delim = "_-";
		delim_len = 2;
	} else if (Z_TYPE_P(delimiter) == IS_STRING && Z_STRLEN_P(delimiter) > 0) {
		delim = Z_STRVAL_P(delimiter);
		delim_len = Z_STRLEN_P(delimiter);
	} else {
		zend_error(E_WARNING, "The second argument passed to the camelize() must be a string containing at least one character");
		RETURN_EMPTY_STRING();
	}

	marker = Z_STRVAL_P(str);
	len    = Z_STRLEN_P(str);

	for (i = 0; i < len; i++) {
		ch = marker[i];

		if (memchr(delim, ch, delim_len)) {
			pre_del = 1;
			continue;
		}
		if (pre_del == 1) {
			smart_str_appendc(&camelize_str, toupper(ch));
			pre_del = 0;
		} else {
			smart_str_appendc(&camelize_str, tolower(ch));
		}
	}

	smart_str_0(&camelize_str);

	if (camelize_str.c) {
		RETURN_STRINGL(camelize_str.c, camelize_str.len, 0);
	}

	RETURN_EMPTY_STRING();
}

/**
 * Convert a camelized to a dash/underscored texts (an optional delimiter can be specified)
 */
void zephir_uncamelize(zval *return_value, const zval *str, const zval *delimiter) {

	unsigned int i;
	smart_str uncamelize_str = {0};
	char *marker, ch, delim;

	if (Z_TYPE_P(str) != IS_STRING) {
		zend_error(E_WARNING, "Invalid arguments supplied for uncamelize()");
		RETURN_EMPTY_STRING();
	}

	if (delimiter == NULL || Z_TYPE_P(delimiter) == IS_NULL) {
		delim = '_';
	} else if (Z_TYPE_P(delimiter) == IS_STRING && Z_STRLEN_P(delimiter) == 1) {
		delim = *(Z_STRVAL_P(delimiter));
	} else {
		zend_error(E_WARNING, "Second argument passed to the uncamelize() must be a string of one character");
		RETURN_EMPTY_STRING();
	}

	marker = Z_STRVAL_P(str);
	for (i = 0; i < Z_STRLEN_P(str); i++) {

		ch = *marker;

		if (ch == '\0') {
			break;
		}

		if (ch >= 'A' && ch <= 'Z') {
			if (i > 0) {
				smart_str_appendc(&uncamelize_str, delim);
			}
			smart_str_appendc(&uncamelize_str, (*marker) + 32);
		} else {
			smart_str_appendc(&uncamelize_str, (*marker));
		}

		marker++;
	}
	smart_str_0(&uncamelize_str);

	if (uncamelize_str.c) {
		RETURN_STRINGL(uncamelize_str.c, uncamelize_str.len, 0);
	} else {
		RETURN_EMPTY_STRING();
	}
}

/**
 * Fast call to explode php function
 */
void zephir_fast_explode(zval *return_value, zval *delimiter, zval *str, long limit TSRMLS_DC) {

	if (UNEXPECTED(Z_TYPE_P(str) != IS_STRING || Z_TYPE_P(delimiter) != IS_STRING)) {
		zend_error(E_WARNING, "Invalid arguments supplied for explode()");
		RETURN_EMPTY_STRING();
	}

	array_init(return_value);
	php_explode(delimiter, str, return_value, limit);
}

/**
 * Fast call to explode php function
 */
void zephir_fast_explode_str(zval *return_value, const char *delimiter, int delimiter_length, zval *str, long limit TSRMLS_DC) {

	zval delimiter_zval;

	if (UNEXPECTED(Z_TYPE_P(str) != IS_STRING)) {
		zend_error(E_WARNING, "Invalid arguments supplied for explode()");
		RETURN_EMPTY_STRING();
	}

	ZVAL_STRINGL(&delimiter_zval, delimiter, delimiter_length, 0);

	array_init(return_value);
	php_explode(&delimiter_zval, str, return_value, limit);
}

/**
 * Check if a string is contained into another
 */
int zephir_memnstr(const zval *haystack, const zval *needle ZEPHIR_DEBUG_PARAMS) {

	if (Z_TYPE_P(haystack) != IS_STRING || Z_TYPE_P(needle) != IS_STRING) {
		#ifndef ZEPHIR_RELEASE
		zend_error(E_WARNING, "Invalid arguments supplied for memnstr in %s on line %d", file, line);
		#else
		zend_error(E_WARNING, "Invalid arguments supplied for memnstr()");
		#endif
		return 0;
	}

	if (Z_STRLEN_P(haystack) >= Z_STRLEN_P(needle)) {
		return php_memnstr(Z_STRVAL_P(haystack), Z_STRVAL_P(needle), Z_STRLEN_P(needle), Z_STRVAL_P(haystack) + Z_STRLEN_P(haystack)) ? 1 : 0;
	}

	return 0;
}

/**
 * Check if a string is contained into another
 */
int zephir_memnstr_str(const zval *haystack, char *needle, unsigned int needle_length ZEPHIR_DEBUG_PARAMS) {

	if (Z_TYPE_P(haystack) != IS_STRING) {
		#ifndef ZEPHIR_RELEASE
		zend_error(E_WARNING, "Invalid arguments supplied for memnstr in %s on line %d", file, line);
		#else
		zend_error(E_WARNING, "Invalid arguments supplied for memnstr()");
		#endif
		return 0;
	}

	if (Z_STRLEN_P(haystack) >= needle_length) {
		return php_memnstr(Z_STRVAL_P(haystack), needle, needle_length, Z_STRVAL_P(haystack) + Z_STRLEN_P(haystack)) ? 1 : 0;
	}

	return 0;
}

/**
 * Inmediate function resolution for strpos function
 */
void zephir_fast_strpos(zval *return_value, const zval *haystack, const zval *needle, unsigned int offset) {

	const char *found = NULL;

	if (UNEXPECTED(Z_TYPE_P(haystack) != IS_STRING || Z_TYPE_P(needle) != IS_STRING)) {
		ZVAL_NULL(return_value);
		zend_error(E_WARNING, "Invalid arguments supplied for strpos()");
		return;
	}

	if (offset > Z_STRLEN_P(haystack)) {
		ZVAL_NULL(return_value);
		zend_error(E_WARNING, "Offset not contained in string");
		return;
	}

	if (!Z_STRLEN_P(needle)) {
		ZVAL_NULL(return_value);
		zend_error(E_WARNING, "Empty delimiter");
		return;
	}

	found = php_memnstr(Z_STRVAL_P(haystack)+offset, Z_STRVAL_P(needle), Z_STRLEN_P(needle), Z_STRVAL_P(haystack) + Z_STRLEN_P(haystack));

	if (found) {
		ZVAL_LONG(return_value, found-Z_STRVAL_P(haystack));
	} else {
		ZVAL_BOOL(return_value, 0);
	}

}

/**
 * Inmediate function resolution for strpos function
 */
void zephir_fast_strpos_str(zval *return_value, const zval *haystack, char *needle, unsigned int needle_length) {

	const char *found = NULL;

	if (UNEXPECTED(Z_TYPE_P(haystack) != IS_STRING)) {
		ZVAL_NULL(return_value);
		zend_error(E_WARNING, "Invalid arguments supplied for strpos()");
		return;
	}

	found = php_memnstr(Z_STRVAL_P(haystack), needle, needle_length, Z_STRVAL_P(haystack) + Z_STRLEN_P(haystack));

	if (found) {
		ZVAL_LONG(return_value, found-Z_STRVAL_P(haystack));
	} else {
		ZVAL_BOOL(return_value, 0);
	}
}

/**
 * Inmediate function resolution for stripos function
 */
void zephir_fast_stripos_str(zval *return_value, zval *haystack, char *needle, unsigned int needle_length) {

	const char *found = NULL;
	char *needle_dup, *haystack_dup;

	if (UNEXPECTED(Z_TYPE_P(haystack) != IS_STRING)) {
		ZVAL_NULL(return_value);
		zend_error(E_WARNING, "Invalid arguments supplied for stripos()");
		return;
	}

	haystack_dup = estrndup(Z_STRVAL_P(haystack), Z_STRLEN_P(haystack));
	php_strtolower(haystack_dup, Z_STRLEN_P(haystack));

	needle_dup = estrndup(needle, needle_length);
	php_strtolower(needle_dup, needle_length);

	found = php_memnstr(haystack_dup, needle, needle_length, haystack_dup + Z_STRLEN_P(haystack));

	efree(haystack_dup);
	efree(needle_dup);

	if (found) {
		ZVAL_LONG(return_value, found-Z_STRVAL_P(haystack));
	} else {
		ZVAL_BOOL(return_value, 0);
	}
}

/**
 * Immediate function resolution for str_replace function
 */
void zephir_fast_str_replace(zval **return_value_ptr, zval *search, zval *replace, zval *subject TSRMLS_DC) {

	zval replace_copy, search_copy;
	zval *return_value = *return_value_ptr;
	int copy_replace = 0, copy_search = 0;

	if (Z_TYPE_P(subject) != IS_STRING) {
		ZVAL_NULL(return_value);
		zend_error(E_WARNING, "Invalid arguments supplied for str_replace()");
		return;
	}

	/**
	 * Fallback to userland function if the first parameter is an array
	 */
	if (Z_TYPE_P(search) == IS_ARRAY) {
		do {
			zval *params[] = { search, replace, subject };
			zval_ptr_dtor(return_value_ptr);
			*return_value_ptr = NULL;
			zephir_call_func_aparams(return_value_ptr, "str_replace", sizeof("str_replace")-1, NULL, 0, 3, params TSRMLS_CC);
			return;
		} while(0);
	}

	if (Z_TYPE_P(replace) != IS_STRING) {
		zend_make_printable_zval(replace, &replace_copy, &copy_replace);
		if (copy_replace) {
			replace = &replace_copy;
		}
	}

	if (Z_TYPE_P(search) != IS_STRING) {
		zend_make_printable_zval(search, &search_copy, &copy_search);
		if (copy_search) {
			search = &search_copy;
		}
	}

	Z_TYPE_P(return_value) = IS_STRING;
	if (Z_STRLEN_P(subject) == 0) {
		ZVAL_STRINGL(return_value, "", 0, 1);
		return;
	}

	if (Z_STRLEN_P(search) == 1) {
		php_char_to_str_ex(Z_STRVAL_P(subject),
			Z_STRLEN_P(subject),
			Z_STRVAL_P(search)[0],
			Z_STRVAL_P(replace),
			Z_STRLEN_P(replace),
			return_value,
			1,
			NULL);
	} else {
		if (Z_STRLEN_P(search) > 1) {
			Z_STRVAL_P(return_value) = php_str_to_str_ex(Z_STRVAL_P(subject), Z_STRLEN_P(subject),
				Z_STRVAL_P(search), Z_STRLEN_P(search),
				Z_STRVAL_P(replace), Z_STRLEN_P(replace), &Z_STRLEN_P(return_value), 1, NULL);
		} else {
			MAKE_COPY_ZVAL(&subject, return_value);
		}
	}

	if (copy_replace) {
		zval_dtor(replace);
	}

	if (copy_search) {
		zval_dtor(search);
	}
}

/**
 * Fast call to PHP trim() function
 */
void zephir_fast_trim(zval *return_value, zval *str, zval *charlist, int where TSRMLS_DC) {

	zval copy;
	int use_copy = 0;

	if (Z_TYPE_P(str) != IS_STRING) {
		zend_make_printable_zval(str, &copy, &use_copy);
		if (use_copy) {
			str = &copy;
		}
	}

	if (charlist && Z_TYPE_P(charlist) == IS_STRING) {
		php_trim(Z_STRVAL_P(str), Z_STRLEN_P(str), Z_STRVAL_P(charlist), Z_STRLEN_P(charlist), return_value, where TSRMLS_CC);
	} else {
		php_trim(Z_STRVAL_P(str), Z_STRLEN_P(str), NULL, 0, return_value, where TSRMLS_CC);
	}

	if (use_copy) {
		zval_dtor(&copy);
	}
}

/**
 * Fast call to PHP strip_tags() function
 */
void zephir_fast_strip_tags(zval *return_value, zval *str) {

	zval copy;
	int use_copy = 0;
	char *stripped;
	size_t len;

	if (Z_TYPE_P(str) != IS_STRING) {
		zend_make_printable_zval(str, &copy, &use_copy);
		if (use_copy) {
			str = &copy;
		}
	}

	stripped = estrndup(Z_STRVAL_P(str), Z_STRLEN_P(str));
	len = php_strip_tags(stripped, Z_STRLEN_P(str), NULL, NULL, 0);

	if (use_copy) {
		zval_dtor(&copy);
	}

	ZVAL_STRINGL(return_value, stripped, len, 0);
}

/**
 * Fast call to PHP strtoupper() function
 */
void zephir_fast_strtoupper(zval *return_value, zval *str) {

	zval copy;
	int use_copy = 0;
	char *lower_str;
	unsigned int length;

	if (Z_TYPE_P(str) != IS_STRING) {
		zend_make_printable_zval(str, &copy, &use_copy);
		if (use_copy) {
			str = &copy;
		}
	}

	length = Z_STRLEN_P(str);
	lower_str = estrndup(Z_STRVAL_P(str), length);
	php_strtoupper(lower_str, length);

	if (use_copy) {
		zval_dtor(str);
	}

	ZVAL_STRINGL(return_value, lower_str, length, 0);
}

/**
 * Checks if a zval string starts with a zval string
 */
int zephir_start_with(const zval *str, const zval *compared, zval *case_sensitive)
{

	int i;
	int sensitive = 0;
	char *op1_cursor, *op2_cursor;

	if (Z_TYPE_P(str) != IS_STRING || Z_TYPE_P(compared) != IS_STRING) {
		return 0;
	}

	if (!Z_STRLEN_P(compared) || !Z_STRLEN_P(str) || Z_STRLEN_P(compared) > Z_STRLEN_P(str)) {
		return 0;
	}

	if (case_sensitive) {
		sensitive = zend_is_true(case_sensitive);
	}

	if (!sensitive) {
		return !memcmp(Z_STRVAL_P(str), Z_STRVAL_P(compared), Z_STRLEN_P(compared));
	}

	op1_cursor = Z_STRVAL_P(str);
	op2_cursor = Z_STRVAL_P(compared);
	for (i = 0; i < Z_STRLEN_P(compared); i++) {

		if (tolower(*op1_cursor) != tolower(*op2_cursor)) {
			return 0;
		}

		op1_cursor++;
		op2_cursor++;
	}

	return 1;
}

/**
 * Checks if a zval string starts with a string
 */
int zephir_start_with_str(const zval *str, char *compared, unsigned int compared_length)
{

	if (Z_TYPE_P(str) != IS_STRING || compared_length > Z_STRLEN_P(str)) {
		return 0;
	}

	return !memcmp(Z_STRVAL_P(str), compared, compared_length);
}

/**
 * Checks if a string starts with other string
 */
int zephir_start_with_str_str(char *str, unsigned int str_length, char *compared, unsigned int compared_length)
{

	if (compared_length > str_length) {
		return 0;
	}

	return !memcmp(str, compared, compared_length);
}

/**
 * Checks if a zval string ends with a zval string
 */
int zephir_end_with(const zval *str, const zval *compared, zval *case_sensitive) {

	int sensitive = 0;
	int i;
	char *op1_cursor, *op2_cursor;

	if (Z_TYPE_P(str) != IS_STRING || Z_TYPE_P(compared) != IS_STRING) {
		return 0;
	}

	if (!Z_STRLEN_P(compared) || !Z_STRLEN_P(str) || Z_STRLEN_P(compared) > Z_STRLEN_P(str)) {
		return 0;
	}

	if (case_sensitive) {
		sensitive = zend_is_true(case_sensitive);
	}

	if (!sensitive) {
		return !memcmp(Z_STRVAL_P(str) + Z_STRLEN_P(str) - Z_STRLEN_P(compared), Z_STRVAL_P(compared), Z_STRLEN_P(compared));
	}

	op1_cursor = Z_STRVAL_P(str) + Z_STRLEN_P(str) - Z_STRLEN_P(compared);
	op2_cursor = Z_STRVAL_P(compared);

	for (i = 0; i < Z_STRLEN_P(compared); ++i) {

		if (tolower(*op1_cursor) != tolower(*op2_cursor)) {
			return 0;
		}

		++op1_cursor;
		++op2_cursor;
	}

	return 1;
}

/**
 * Checks if a zval string ends with a *char string
 */
int zephir_end_with_str(const zval *str, char *compared, unsigned int compared_length) {

	if (Z_TYPE_P(str) != IS_STRING) {
		return 0;
	}

	if (!compared_length || !Z_STRLEN_P(str) || compared_length > Z_STRLEN_P(str)) {
		return 0;
	}

	return !memcmp(Z_STRVAL_P(str) + Z_STRLEN_P(str) - compared_length, compared, compared_length);
}

/**
 *
 */
void zephir_random_string(zval *return_value, const zval *type, const zval *length TSRMLS_DC) {

	long i, rand_type, ch;
	smart_str random_str = {0};

	if (Z_TYPE_P(type) != IS_LONG) {
		return;
	}

	if (Z_LVAL_P(type) > PH_RANDOM_NOZERO) {
		return;
	}

	if (Z_TYPE_P(length) != IS_LONG) {
		return;
	}

	/** Generate seed */
	if (!BG(mt_rand_is_seeded)) {
		php_mt_srand(GENERATE_SEED() TSRMLS_CC);
	}

	for (i = 0; i < Z_LVAL_P(length); i++) {

		switch (Z_LVAL_P(type)) {

			case PH_RANDOM_ALNUM:
				rand_type = (long) (php_mt_rand(TSRMLS_C) >> 1);
				RAND_RANGE(rand_type, 0, 3, PHP_MT_RAND_MAX);
				break;

			case PH_RANDOM_ALPHA:
				rand_type = (long) (php_mt_rand(TSRMLS_C) >> 1);
				RAND_RANGE(rand_type, 1, 2, PHP_MT_RAND_MAX);
				break;

			case PH_RANDOM_HEXDEC:
				rand_type = (long) (php_mt_rand(TSRMLS_C) >> 1);
				RAND_RANGE(rand_type, 0, 1, PHP_MT_RAND_MAX);
				break;

			case PH_RANDOM_NUMERIC:
				rand_type = 0;
				break;

			case PH_RANDOM_NOZERO:
				rand_type = 5;
				break;

			default:
				continue;
		}

		switch (rand_type) {

			case 0:
				ch = (long) (php_mt_rand(TSRMLS_C) >> 1);
				RAND_RANGE(ch, '0', '9', PHP_MT_RAND_MAX);
				break;

			case 1:
				ch = (long) (php_mt_rand(TSRMLS_C) >> 1);
				RAND_RANGE(ch, 'a', 'f', PHP_MT_RAND_MAX);
				break;

			case 2:
				ch = (long) (php_mt_rand(TSRMLS_C) >> 1);
				RAND_RANGE(ch, 'a', 'z', PHP_MT_RAND_MAX);
				break;

			case 3:
				ch = (long) (php_mt_rand(TSRMLS_C) >> 1);
				RAND_RANGE(ch, 'A', 'Z', PHP_MT_RAND_MAX);
				break;

			case 5:
				ch = (long) (php_mt_rand(TSRMLS_C) >> 1);
				RAND_RANGE(ch, '1', '9', PHP_MT_RAND_MAX);
				break;

			default:
				continue;
		}

		smart_str_appendc(&random_str, (unsigned int) ch);
	}

	smart_str_0(&random_str);

	if (random_str.len) {
		RETURN_STRINGL(random_str.c, random_str.len, 0);
	} else {
		smart_str_free(&random_str);
		RETURN_EMPTY_STRING();
	}
}

/**
 * Removes slashes at the end of a string
 */
void zephir_remove_extra_slashes(zval *return_value, const zval *str) {

	char *cursor, *removed_str;
	unsigned int i;

	if (Z_TYPE_P(str) != IS_STRING) {
		RETURN_EMPTY_STRING();
	}

	if (Z_STRLEN_P(str) > 1) {
		cursor = Z_STRVAL_P(str);
		cursor += (Z_STRLEN_P(str) - 1);
		for (i = Z_STRLEN_P(str); i > 0; i--) {
			if ((*cursor) == '/') {
				cursor--;
				continue;
			}
			break;
		}
	} else {
		i = Z_STRLEN_P(str);
	}

	removed_str = emalloc(i + 1);
	memcpy(removed_str, Z_STRVAL_P(str), i);
	removed_str[i] = '\0';

	RETURN_STRINGL(removed_str, i, 0);
}

/**
 * This function is not external in the Zend API so we redeclare it here in the extension
 */
int zephir_spprintf(char **message, int max_len, char *format, ...)
{
	va_list arg;
	int len;

	va_start(arg, format);
	len = vspprintf(message, max_len, format, arg);
	va_end(arg);
	return len;
}

/**
 * Makes a substr like the PHP function. This function SUPPORT negative from and length
 */
void zephir_substr(zval *return_value, zval *str, long f, long l, int flags) {

	zval copy;
	int use_copy = 0;
	int str_len;

	if (Z_TYPE_P(str) != IS_STRING) {

		if (Z_TYPE_P(str) == IS_NULL || Z_TYPE_P(str) == IS_BOOL) {
			RETURN_FALSE;
		}

		if (Z_TYPE_P(str) != IS_STRING) {
			zend_make_printable_zval(str, &copy, &use_copy);
			if (use_copy) {
				str = &copy;
			}
		}
	}

	str_len = Z_STRLEN_P(str);
	if ((flags & ZEPHIR_SUBSTR_NO_LENGTH) == ZEPHIR_SUBSTR_NO_LENGTH) {
		l = str_len;
	}

	if ((l < 0 && -l > str_len)) {
		if (use_copy) {
			zval_dtor(str);
		}
		RETURN_FALSE;
	} else {
		if (l > str_len) {
			l = str_len;
		}
	}

	if (f > str_len) {
		if (use_copy) {
			zval_dtor(str);
		}
		RETURN_FALSE;
	} else {
		if (f < 0 && -f > str_len) {
			f = 0;
		}
	}

	if (l < 0 && (l + str_len - f) < 0) {
		if (use_copy) {
			zval_dtor(str);
		}
		RETURN_FALSE;
	}

	/* if "from" position is negative, count start position from the end
	 * of the string
	 */
	if (f < 0) {
		f = str_len + f;
		if (f < 0) {
			f = 0;
		}
	}

	/* if "length" position is negative, set it to the length
	 * needed to stop that many chars from the end of the string
	 */
	if (l < 0) {
		l = (str_len - f) + l;
		if (l < 0) {
			l = 0;
		}
	}

	if (f >= str_len) {
		if (use_copy) {
			zval_dtor(str);
		}
		RETURN_FALSE;
	}

	if ((f + l) > str_len) {
		l = str_len - f;
	}

	if (!l) {
		if (use_copy) {
			zval_dtor(str);
		}
		RETURN_EMPTY_STRING();
	}

	ZVAL_STRINGL(return_value, Z_STRVAL_P(str) + f, l, 1);

	if (use_copy) {
		zval_dtor(str);
	}

	return;
}

void zephir_append_printable_array(smart_str *implstr, zval *value TSRMLS_DC) {

	zval         **tmp;
	HashTable      *arr;
	HashPosition   pos;
	unsigned int numelems, i = 0, str_len;

	arr = Z_ARRVAL_P(value);
	numelems = zend_hash_num_elements(arr);

	smart_str_appendc(implstr, '[');

	if (numelems > 0) {
		zend_hash_internal_pointer_reset_ex(arr, &pos);
		while (zend_hash_get_current_data_ex(arr, (void **) &tmp, &pos) == SUCCESS) {

			/**
			 * We don't serialize objects
			 */
			if (Z_TYPE_PP(tmp) == IS_OBJECT) {
				smart_str_appendc(implstr, 'O');
				{
					char stmp[MAX_LENGTH_OF_LONG + 1];
					str_len = slprintf(stmp, sizeof(stmp), "%ld", Z_OBJVAL_PP(tmp).handle);
					smart_str_appendl(implstr, stmp, str_len);
				}
			} else {
				if (Z_TYPE_PP(tmp) == IS_ARRAY) {
					zephir_append_printable_array(implstr, *tmp TSRMLS_CC);
				} else {
					zephir_append_printable_zval(implstr, tmp TSRMLS_CC);
				}
			}

			if (++i != numelems) {
				smart_str_appendc(implstr, ',');
			}

			zend_hash_move_forward_ex(arr, &pos);
		}
	}

	smart_str_appendc(implstr, ']');
}

/**
 * Creates a unique key to be used as index in a hash
 */
void zephir_unique_key(zval *return_value, zval *prefix, zval *value TSRMLS_DC)
{

	smart_str implstr = {0};

	if (Z_TYPE_P(prefix) == IS_STRING) {
		smart_str_appendl(&implstr, Z_STRVAL_P(prefix), Z_STRLEN_P(prefix));
	}

	if (Z_TYPE_P(value) == IS_ARRAY) {
		zephir_append_printable_array(&implstr, value TSRMLS_CC);
	} else {
		zephir_append_printable_zval(&implstr, &value TSRMLS_CC);
	}

	smart_str_0(&implstr);

	if (implstr.len) {
		RETURN_STRINGL(implstr.c, implstr.len, 0);
	} else {
		smart_str_free(&implstr);
		RETURN_NULL();
	}
}

/**
 * Returns the PHP_EOL (if the passed parameter is TRUE)
 */
zval *zephir_eol(int eol TSRMLS_DC) {

	zval *local_eol;

	/**
	 * Initialize local var
	 */
	ZEPHIR_INIT_VAR(local_eol);

	/**
	 * Check if the eol is true and return PHP_EOL or empty string
	 */
	if (eol) {
		ZVAL_STRING(local_eol, PHP_EOL, 1);
	} else {
		ZVAL_EMPTY_STRING(local_eol);
	}

	return local_eol;
}

/**
 * Base 64 encode
 */
void zephir_base64_encode(zval *return_value, zval *data) {

	zval copy;
	char *encoded;
	int use_copy = 0, length;

	if (Z_TYPE_P(data) != IS_STRING) {
		zend_make_printable_zval(data, &copy, &use_copy);
		if (use_copy) {
			data = &copy;
		}
	}

	encoded = (char *) php_base64_encode((unsigned char *)(Z_STRVAL_P(data)), Z_STRLEN_P(data), &length);

	if (use_copy) {
		zval_dtor(data);
	}

	if (encoded) {
		RETURN_STRINGL(encoded, length, 0);
	} else {
		RETURN_NULL();
	}
}

/**
 * Base 64 decode
 */
void zephir_base64_decode(zval *return_value, zval *data) {

	zval copy;
	char *decoded;
	int use_copy = 0, length;

	if (Z_TYPE_P(data) != IS_STRING) {
		zend_make_printable_zval(data, &copy, &use_copy);
		if (use_copy) {
			data = &copy;
		}
	}

	decoded = (char *) php_base64_decode((unsigned char *)(Z_STRVAL_P(data)), Z_STRLEN_P(data), &length);

	if (use_copy) {
		zval_dtor(data);
	}

	if (decoded) {
		RETURN_STRINGL(decoded, length, 0);
	} else {
		RETURN_NULL();
	}
}

void zephir_md5(zval *return_value, zval *str) {

	PHP_MD5_CTX ctx;
	unsigned char digest[16];
	char hexdigest[33];
	zval copy;
	int use_copy = 0;

	if (Z_TYPE_P(str) != IS_STRING) {
		zend_make_printable_zval(str, &copy, &use_copy);
		if (use_copy) {
			str = &copy;
		}
	}

	PHP_MD5Init(&ctx);
	PHP_MD5Update(&ctx, Z_STRVAL_P(str), Z_STRLEN_P(str));
	PHP_MD5Final(digest, &ctx);

	make_digest(hexdigest, digest);

	ZVAL_STRINGL(return_value, hexdigest, 32, 1);
}

void zephir_crc32(zval *return_value, zval *str TSRMLS_DC) {

	zval copy;
	int use_copy = 0;
	size_t nr;
	char *p;
	php_uint32 crc;
	php_uint32 crcinit = 0;

	if (Z_TYPE_P(str) != IS_STRING) {
		zend_make_printable_zval(str, &copy, &use_copy);
		if (use_copy) {
			str = &copy;
		}
	}

	p = Z_STRVAL_P(str);
	nr = Z_STRLEN_P(str);

	crc = crcinit^0xFFFFFFFF;
	for (; nr--; ++p) {
		crc = ((crc >> 8) & 0x00FFFFFF) ^ crc32tab[(crc ^ (*p)) & 0xFF];
	}

	if (use_copy) {
		zval_dtor(str);
	}

	RETVAL_LONG(crc ^ 0xFFFFFFFF);
}

#ifdef ZEPHIR_USE_PHP_PCRE

/**
 * Execute preg-match without function lookup in the PHP userland
 */
void zephir_preg_match(zval *return_value, zval *regex, zval *subject, zval *matches, int global, long flags, long offset TSRMLS_DC) {

	zval copy;
	int use_copy = 0;
	pcre_cache_entry *pce;

	if (Z_TYPE_P(regex) != IS_STRING) {
		zend_error(E_WARNING, "Invalid arguments supplied for zephir_preg_match()");
		RETURN_FALSE;
	}

	if (Z_TYPE_P(subject) != IS_STRING) {
		zend_make_printable_zval(subject, &copy, &use_copy);
		if (use_copy) {
			subject = &copy;
		}
	}

	/* Compile regex or get it from cache. */
	if ((pce = pcre_get_compiled_regex_cache(Z_STRVAL_P(regex), Z_STRLEN_P(regex) TSRMLS_CC)) == NULL) {

		if (use_copy) {
			zval_dtor(subject);
		}

		RETURN_FALSE;
	}

	if (flags != 0 || offset != 0) {
		php_pcre_match_impl(pce, Z_STRVAL_P(subject), Z_STRLEN_P(subject), return_value, matches, global, 1, flags, offset TSRMLS_CC);
	} else {
		php_pcre_match_impl(pce, Z_STRVAL_P(subject), Z_STRLEN_P(subject), return_value, matches, global, 0, 0, 0 TSRMLS_CC);
	}

	if (use_copy) {
		zval_dtor(&copy);
	}
}

#else

void zephir_preg_match(zval *return_value, zval *regex, zval *subject, zval *matches, int global, long flags, long offset TSRMLS_DC)
{
	zval tmp_flags;
	zval tmp_offset;
	zval *rv = NULL;
	zval **rvp = &rv;

	if (matches) {
		Z_SET_ISREF_P(matches);
	}
	ZEPHIR_SINIT_VAR(tmp_flags);
	ZEPHIR_SINIT_VAR(tmp_offset);
	ZVAL_LONG(&tmp_flags, flags);
	ZVAL_LONG(&tmp_offset, offset);

	{
		zval *tmp_params[5] = { regex, subject, matches, &tmp_flags, &tmp_offset };

		if (global) {
			zephir_call_func_aparams(rvp, SL("preg_match_all"), NULL, 0, 5, tmp_params TSRMLS_CC);
		} else {
			zephir_call_func_aparams(rvp, SL("preg_match"), NULL, 0, 5, tmp_params TSRMLS_CC);
		}
	}
	if (matches) {
		Z_UNSET_ISREF_P(matches);
	}

	if (return_value) {
		COPY_PZVAL_TO_ZVAL(*return_value, rv);
	}
}

#endif /* ZEPHIR_USE_PHP_PCRE */

#ifdef ZEPHIR_USE_PHP_JSON

int zephir_json_encode(zval *return_value, zval **return_value_ptr, zval *v, int opts TSRMLS_DC) {

	smart_str buf = { NULL, 0, 0 };

	php_json_encode(&buf, v, opts TSRMLS_CC);
	smart_str_0(&buf);
	ZVAL_STRINGL(return_value, buf.c, buf.len, 0);

	return SUCCESS;
}

int zephir_json_decode(zval *return_value, zval **return_value_ptr, zval *v, zend_bool assoc TSRMLS_DC) {

	zval copy;
	int use_copy = 0;

	if (UNEXPECTED(Z_TYPE_P(v) != IS_STRING)) {
		zend_make_printable_zval(v, &copy, &use_copy);
		if (use_copy) {
			v = &copy;
		}
	}

	php_json_decode(return_value, Z_STRVAL_P(v), Z_STRLEN_P(v), assoc, 512 /* JSON_PARSER_DEFAULT_DEPTH */ TSRMLS_CC);

	if (UNEXPECTED(use_copy)) {
		zval_dtor(&copy);
	}

	return SUCCESS;
}

#else

int zephir_json_encode(zval *return_value, zval **return_value_ptr, zval *v, int opts TSRMLS_DC) {

	zval zopts;
	zval *params[2];

	ZEPHIR_SINIT_VAR(zopts);
	ZVAL_LONG(&zopts, opts);

	params[0] = v;
	params[1] = &zopts;

	return zephir_return_call_function(return_value, NULL, ZEND_STRL("json_encode"), NULL, 0, 2, params TSRMLS_CC);
}

int zephir_json_decode(zval *return_value, zval **return_value_ptr, zval *v, zend_bool assoc TSRMLS_DC) {

	zval zassoc;
	zval *params[2];

	ZEPHIR_SINIT_VAR(zassoc);
	ZVAL_BOOL(&zassoc, assoc);

	params[0] = v;
	params[1] = &zassoc;

	return zephir_return_call_function(return_value, NULL, ZEND_STRL("json_decode"), NULL, 0, 2, params TSRMLS_CC);
}

#endif /* ZEPHIR_USE_PHP_JSON */

void zephir_lcfirst(zval *return_value, zval *s) {

	zval copy;
	char *c;
	int use_copy = 0;

	if (UNEXPECTED(Z_TYPE_P(s) != IS_STRING)) {
		zend_make_printable_zval(s, &copy, &use_copy);
		if (use_copy) {
			s = &copy;
		}
	}

	if (!Z_STRLEN_P(s)) {
		ZVAL_EMPTY_STRING(return_value);
	}
	else {
		ZVAL_STRINGL(return_value, Z_STRVAL_P(s), Z_STRLEN_P(s), 1);
		c = Z_STRVAL_P(return_value);
		*c = tolower((unsigned char)*c);
	}

	if (UNEXPECTED(use_copy)) {
		zval_dtor(&copy);
	}
}

void zephir_ucfirst(zval *return_value, zval *s) {

	zval copy;
	char *c;
	int use_copy = 0;

	if (UNEXPECTED(Z_TYPE_P(s) != IS_STRING)) {
		zend_make_printable_zval(s, &copy, &use_copy);
		if (use_copy) {
			s = &copy;
		}
	}

	if (!Z_STRLEN_P(s)) {
		ZVAL_EMPTY_STRING(return_value);
	}
	else {
		ZVAL_STRINGL(return_value, Z_STRVAL_P(s), Z_STRLEN_P(s), 1);
		c = Z_STRVAL_P(return_value);
		*c = toupper((unsigned char)*c);
	}

	if (UNEXPECTED(use_copy)) {
		zval_dtor(&copy);
	}
}

int zephir_http_build_query(zval *return_value, zval *params, char *sep TSRMLS_DC) {

	if (Z_TYPE_P(params) == IS_ARRAY || Z_TYPE_P(params) == IS_OBJECT) {
		smart_str formstr = { NULL, 0, 0 };
		int res;

		res = php_url_encode_hash_ex(HASH_OF(params), &formstr, NULL, 0, NULL, 0, NULL, 0, (Z_TYPE_P(params) == IS_OBJECT ? params : NULL), sep, PHP_QUERY_RFC1738 TSRMLS_CC);

		if (res == SUCCESS) {
			if (!formstr.c) {
				ZVAL_EMPTY_STRING(return_value);
			}
			else {
				smart_str_0(&formstr);
				ZVAL_STRINGL(return_value, formstr.c, formstr.len, 0);
			}

			return SUCCESS;
		}

		smart_str_free(&formstr);
		ZVAL_FALSE(return_value);
	}
	else {
		ZVAL_NULL(return_value);
	}

	return FAILURE;
}

void zephir_htmlspecialchars(zval *return_value, zval *string, zval *quoting, zval *charset TSRMLS_DC) {
	zval copy;
	char *escaped, *cs;
	int qs, use_copy = 0;
	size_t escaped_len;

	if (UNEXPECTED(Z_TYPE_P(string) != IS_STRING)) {
		zend_make_printable_zval(string, &copy, &use_copy);
		if (use_copy) {
			string = &copy;
		}
	}

	cs = (charset && Z_TYPE_P(charset) == IS_STRING) ? Z_STRVAL_P(charset) : NULL;
	qs = (quoting && Z_TYPE_P(quoting) == IS_LONG)   ? Z_LVAL_P(quoting)   : ENT_COMPAT;

	escaped = php_escape_html_entities_ex((unsigned char *)(Z_STRVAL_P(string)), Z_STRLEN_P(string), &escaped_len, 0, qs, cs, 1 TSRMLS_CC);
	ZVAL_STRINGL(return_value, escaped, escaped_len, 0);

	if (UNEXPECTED(use_copy)) {
		zval_dtor(&copy);
	}
}

void zephir_htmlentities(zval *return_value, zval *string, zval *quoting, zval *charset TSRMLS_DC)
{
	zval copy;
	char *escaped, *cs;
	int qs, use_copy = 0;
	size_t escaped_len;

	if (UNEXPECTED(Z_TYPE_P(string) != IS_STRING)) {
		zend_make_printable_zval(string, &copy, &use_copy);
		if (use_copy) {
			string = &copy;
		}
	}

	cs = (charset && Z_TYPE_P(charset) == IS_STRING) ? Z_STRVAL_P(charset) : NULL;
	qs = (quoting && Z_TYPE_P(quoting) == IS_LONG)   ? Z_LVAL_P(quoting)   : ENT_COMPAT;

	escaped = php_escape_html_entities_ex((unsigned char *)(Z_STRVAL_P(string)), Z_STRLEN_P(string), &escaped_len, 1, qs, cs, 1 TSRMLS_CC);
	ZVAL_STRINGL(return_value, escaped, escaped_len, 0);

	if (UNEXPECTED(use_copy)) {
		zval_dtor(&copy);
	}
}

void zephir_strval(zval *return_value, zval *v)
{
	zval copy;
	int use_copy = 0;

	zend_make_printable_zval(v, &copy, &use_copy);
	if (use_copy) {
		zval *tmp = &copy;
		ZVAL_ZVAL(return_value, tmp, 0, 0);
	} else {
		ZVAL_ZVAL(return_value, v, 1, 0);
	}
}

void zephir_date(zval *return_value, zval *format, zval *timestamp TSRMLS_DC)
{
	long int ts;
	zval copy;
	int use_copy = 0;
	char *formatted;

	if (UNEXPECTED(Z_TYPE_P(format) != IS_STRING)) {
		zend_make_printable_zval(format, &copy, &use_copy);
		if (use_copy) {
			format = &copy;
		}
	}

	ts = (timestamp) ? zephir_get_intval(timestamp) : time(NULL);

	formatted = php_format_date(Z_STRVAL_P(format), Z_STRLEN_P(format), ts, 1 TSRMLS_CC);
	ZVAL_STRING(return_value, formatted, 0);

	if (UNEXPECTED(use_copy)) {
		zval_dtor(&copy);
	}
}

void zephir_addslashes(zval *return_value, zval *str TSRMLS_DC)
{
	zval copy;
	int use_copy = 0;

	if (UNEXPECTED(Z_TYPE_P(str) != IS_STRING)) {
		zend_make_printable_zval(str, &copy, &use_copy);
		if (use_copy) {
			str = &copy;
		}
	}

	ZVAL_STRING(return_value, php_addslashes(Z_STRVAL_P(str), Z_STRLEN_P(str), &Z_STRLEN_P(return_value), 0 TSRMLS_CC), 0);

	if (UNEXPECTED(use_copy)) {
		zval_dtor(&copy);
	}
}

void zephir_stripslashes(zval *return_value, zval *str TSRMLS_DC)
{
	zval copy;
	int use_copy = 0;

	if (UNEXPECTED(Z_TYPE_P(str) != IS_STRING)) {
		zend_make_printable_zval(str, &copy, &use_copy);
		if (use_copy) {
			str = &copy;
		}
	}

	ZVAL_STRINGL(return_value, Z_STRVAL_P(str), Z_STRLEN_P(str), 1);
	php_stripslashes(Z_STRVAL_P(return_value), &Z_STRLEN_P(return_value) TSRMLS_CC);

	if (UNEXPECTED(use_copy)) {
		zval_dtor(&copy);
	}
}

void zephir_stripcslashes(zval *return_value, zval *str TSRMLS_DC)
{

	zval copy;
	int use_copy = 0;

	if (UNEXPECTED(Z_TYPE_P(str) != IS_STRING)) {
		zend_make_printable_zval(str, &copy, &use_copy);
		if (use_copy) {
			str = &copy;
		}
	}

	ZVAL_STRINGL(return_value, Z_STRVAL_P(str), Z_STRLEN_P(str), 1);
	php_stripcslashes(Z_STRVAL_P(return_value), &Z_STRLEN_P(return_value));

	if (UNEXPECTED(use_copy)) {
		zval_dtor(&copy);
	}
}

/**
 * Compares two strings using the same time whether they're equal or not.
 * A difference in length will leak
 */
int zephir_hash_equals(const zval *known_zval, const zval *user_zval)
{
	char *known_str, *user_str;
	int result = 0;
	size_t j;

	if (Z_TYPE_P(known_zval) != IS_STRING || Z_TYPE_P(user_zval) != IS_STRING) {
		return 0;
	}

	if (Z_STRLEN_P(known_zval) != Z_STRLEN_P(user_zval)) {
		return 0;
	}

	known_str = Z_STRVAL_P(known_zval);
	user_str = Z_STRVAL_P(user_zval);

	for (j = 0; j < Z_STRLEN_P(known_zval); j++) {
		result |= known_str[j] ^ user_str[j];
	}

	return (int) (result == 0);
}

void zephir_string_to_hex(zval *return_value, zval *var)
{
	int use_copy = 0;
	zval copy;
	size_t i;
	char *s;
	char *res;

	if (Z_TYPE_P(var) != IS_STRING) {
		zend_make_printable_zval(var, &copy, &use_copy);
		if (use_copy) {
			var = &copy;
		}
	}

	res = emalloc(2*Z_STRLEN_P(var) + 1);
	s   = Z_STRVAL_P(var);
	for (i=0; i<Z_STRLEN_P(var); ++i) {
		sprintf(res + 2*i, "%hhX", s[i]);
	}

	res[2*Z_STRLEN_P(var)] = 0;
	ZVAL_STRINGL(return_value, res, 2*Z_STRLEN_P(var), 0);

	if (use_copy) {
		zval_dtor(var);
	}
}