WebSVN – php_utils – Diff – /trunk/misc_functions.inc.php


<?php
 
/*
 * PHP Utilities - Misc functions
 * Copyright 2019 - 2023 Daniel Marschall, ViaThinkSoft
 * Revision: 2023-08-01
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
 
// array(89,51,10,10) => 'Y3\012\012'
function c_literal($byte_array) {
        $out = "'";
        foreach ($byte_array as $c) {
                if (is_string($c)) $c = ord($c);
                if ((($c >= 0x00) && ($c <= 0x1F)) || ($c >= 0x7F)) {
                        // For non-printable characters use octal notation:
                        // \000 ... \377
                        $out .= "\\".str_pad(base_convert(''.$c,10,8), 3, '0', STR_PAD_LEFT);
                } else {
                        if (chr($c) == "'") $out .= '\\';
                        $out .= chr($c);
                }
        }
        $out .= "'";
        return $out;
}
 
function c_literal_hexstr($hexstr) {
        $odd_char = (strlen($hexstr)%2 != 0) ? '0x'.substr($hexstr,-1).'<<4' : '';
        $hexstr = substr($hexstr,0,2*(int)floor(strlen($hexstr)/2));
        if ($hexstr != '') {
                $ary = str_split(hex2bin($hexstr));
                foreach ($ary as &$a) $a = ord($a);
                return rtrim(c_literal($ary).' '.$odd_char);
        } else {
                return $odd_char;
        }
}
 
function generateRandomString($length) {
        // Note: This function can be used in temporary file names, so you
        // may not generate illegal file name characters.
        $characters = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
        $charactersLength = strlen($characters);
        $randomString = '';
        for ($i = 0; $i < $length; $i++) {
                $randomString .= $characters[rand(0, $charactersLength - 1)];
        }
        return $randomString;
}
 
function trim_br($html) {
        $count = 0;
        do { $html = preg_replace('@^\s*<\s*br\s*/{0,1}\s*>@isU', '', $html, -1, $count); } while ($count > 0); // left trim
        do { $html = preg_replace('@<\s*br\s*/{0,1}\s*>\s*$@isU', '', $html, -1, $count); } while ($count > 0); // right trim
        return $html;
}
 
function insertWhitespace($str, $index) {
        return substr($str, 0, $index) . ' ' . substr($str, $index);
}
 
function js_escape($data) {
        // TODO.... json_encode??
        $data = str_replace('\\', '\\\\', $data);
        $data = str_replace('\'', '\\\'', $data);
        return "'" . $data . "'";
}
 
function get_calling_function() {
        $ex = new Exception();
        $trace = $ex->getTrace();
        if (!isset($trace[2])) return '(main)';
        $final_call = $trace[2];
        return $final_call['file'].':'.$final_call['line'].'/'.$final_call['function'].'()';
}
 
function convert_to_utf8_no_bom($cont) {
        $cont = vts_utf8_encode($cont);
 
        // Remove BOM
        $bom = pack('H*','EFBBBF');
        $cont = preg_replace("/^$bom/", '', $cont);
        return $cont;
}
 
function vts_utf8_encode($text) {
        $enc = mb_detect_encoding($text, null, true);
        if ($enc === false) $enc = mb_detect_encoding($text, ['ASCII', 'UTF-8', 'Windows-1252', 'ISO-8859-1'], true);
        if ($enc === false) $enc = null;
 
        if ($enc === 'UTF-8') return $text;
 
        $res = mb_convert_encoding($text, 'UTF-8', $enc);
        if ($res === false) $res = iconv('UTF-8', 'UTF-8//IGNORE', $text);
 
        return $res;
}
 
function vts_utf8_decode($text) {
        $enc = mb_detect_encoding($text, null, true);
        if ($enc === false) $enc = mb_detect_encoding($text, ['ASCII', 'UTF-8', 'Windows-1252', 'ISO-8859-1'], true);
        if ($enc === false) $enc = null;
 
        if ($enc !== 'UTF-8') return $text;
 
        $res = mb_convert_encoding($text, 'Windows-1252', $enc);
        if ($res === false) $res = iconv('Windows-1252', 'Windows-1252//IGNORE', $text);
 
        return $res;
}
 
function stripHtmlComments($html) {
        // https://stackoverflow.com/questions/11337332/how-to-remove-html-comments-in-php
        $html = preg_replace("~<!--(?!<!)[^\[>].*?-->~s", "", $html);
        return $html;
}
 
function wildcard_is_dir($dir) {
        // Example usage:  if (!wildcard_is_dir(OIDplus::localpath().'plugins/'.'*'.'/design/'.$value)) throw new Exception("Design does not exist")
        $dirs = @glob($dir);
        if ($dirs) foreach ($dirs as $dir) {
                if (is_dir($dir)) return true;
        }
        return false;
}
 
function isInternetExplorer() {
 
        $ua = isset($_SERVER['HTTP_USER_AGENT']) ? $_SERVER['HTTP_USER_AGENT'] : '';
        return ((strpos($ua,'MSIE ') !== false) || (strpos($ua,'Trident/') !== false));
}
 
if (!function_exists('str_starts_with')) {
        // PHP 7.x compatibility
        // source: Laravel Framework
        // https://github.com/laravel/framework/blob/8.x/src/Illuminate/Support/Str.php
        function str_starts_with($haystack, $needle) {
                return (string)$needle !== '' && strncmp($haystack, $needle, strlen($needle)) === 0;
        }
}
 
if (!function_exists('str_ends_with')) {
        // PHP 7.x compatibility
        // source: Laravel Framework
        // https://github.com/laravel/framework/blob/8.x/src/Illuminate/Support/Str.php
        function str_ends_with($haystack, $needle) {
 
                return $needle !== '' && substr($haystack, -strlen($needle)) === (string)$needle;
        }
}
 
if (!function_exists('str_contains')) {
        // PHP 7.x compatibility
        // source: Laravel Framework
        // https://github.com/laravel/framework/blob/8.x/src/Illuminate/Support/Str.php
        function str_contains($haystack, $needle) {
                return $needle !== '' && mb_strpos($haystack, $needle) !== false;
        }
}
 
function random_bytes_ex($len, $raw=true, $force_cryptographically_secure=true) {
        if ($len === 0) return '';
        assert($len > 0);
 
        if (function_exists('random_bytes')) {
                try {
                        $a = random_bytes($len);
                } catch (Exception $e) { $a = null; }
                if ($a) return $raw ? $a : bin2hex($a);
        }
 
        if (function_exists('openssl_random_pseudo_bytes')) {
                try {
                        $a = openssl_random_pseudo_bytes($len);
                } catch (Exception $e) { $a = null; }
                if ($a) return $raw ? $a : bin2hex($a);
        }
 
        if (function_exists('mcrypt_create_iv') && defined('MCRYPT_DEV_RANDOM')) {
                try {
                        $a = bin2hex(mcrypt_create_iv($len, MCRYPT_DEV_RANDOM));
                } catch (Exception $e) { $a = null; }
                if ($a) return $raw ? $a : bin2hex($a);
        }
 
        if ($force_cryptographically_secure) {
                $msg = 'Cannot find a fitting Cryptographically Secure Random Number Generator (CSRNG).';
                if (version_compare(PHP_VERSION, '8.2.0') >= 0) {
                        throw new \Random\RandomException($msg);
                } else {
                        throw new \Exception($msg);
                }
        }
 
        if (function_exists('mcrypt_create_iv') && defined('MCRYPT_DEV_URANDOM')) {
                // /dev/urandom uses the same entropy pool than /dev/random, but if there is not enough data
                // then the security is lowered.
                try {
                        $a = bin2hex(mcrypt_create_iv($len, MCRYPT_DEV_URANDOM));
                } catch (Exception $e) { $a = null; }
                if ($a) return $raw ? $a : bin2hex($a);
        }
 
        if (function_exists('mcrypt_create_iv') && defined('MCRYPT_RAND')) {
                try {
                        $a = bin2hex(mcrypt_create_iv($len, MCRYPT_RAND));
                } catch (Exception $e) { $a = null; }
                if ($a) return $raw ? $a : bin2hex($a);
        }
 
        // Fallback to non-secure RNG
        $a = '';
        while (strlen($a) < $len*2) {
                $a .= sha1(uniqid((string)mt_rand(), true));
        }
        $a = substr($a, 0, $len*2);
        return $raw ? hex2bin($a) : $a;
}
 

Subversion Repositories php_utils

php_utils/trunk/misc_functions.inc.php – Rev 63 → 85

Rev 63		Rev 85
1	<?php	1	<?php
2		2
3	/*	3	/*
4	* PHP Utilities - Misc functions	4	* PHP Utilities - Misc functions
5	* Copyright 2019 - 2023 Daniel Marschall, ViaThinkSoft	5	* Copyright 2019 - 2023 Daniel Marschall, ViaThinkSoft
6	* Revision: 2023-02-27	6	* Revision: 2023-08-01
7	*	7	*
8	* Licensed under the Apache License, Version 2.0 (the "License");	8	* Licensed under the Apache License, Version 2.0 (the "License");
9	* you may not use this file except in compliance with the License.	9	* you may not use this file except in compliance with the License.
10	* You may obtain a copy of the License at	10	* You may obtain a copy of the License at
11	*	11	*
12	* http://www.apache.org/licenses/LICENSE-2.0	12	* http://www.apache.org/licenses/LICENSE-2.0
13	*	13	*
14	* Unless required by applicable law or agreed to in writing, software	14	* Unless required by applicable law or agreed to in writing, software
15	* distributed under the License is distributed on an "AS IS" BASIS,	15	* distributed under the License is distributed on an "AS IS" BASIS,
16	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.	16	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
17	* See the License for the specific language governing permissions and	17	* See the License for the specific language governing permissions and
18	* limitations under the License.	18	* limitations under the License.
19	*/	19	*/
20		20
21	// array(89,51,10,10) => 'Y3\012\012'	21	// array(89,51,10,10) => 'Y3\012\012'
22	function c_literal($byte_array) {	22	function c_literal($byte_array) {
23	$out = "'";	23	$out = "'";
24	foreach ($byte_array as $c) {	24	foreach ($byte_array as $c) {
25	if (is_string($c)) $c = ord($c);	25	if (is_string($c)) $c = ord($c);
26	if ((($c >= 0x00) && ($c <= 0x1F)) \|\| ($c >= 0x7F)) {	26	if ((($c >= 0x00) && ($c <= 0x1F)) \|\| ($c >= 0x7F)) {
27	// For non-printable characters use octal notation:	27	// For non-printable characters use octal notation:
28	// \000 ... \377	28	// \000 ... \377
29	$out .= "\\".str_pad(base_convert(''.$c,10,8), 3, '0', STR_PAD_LEFT);	29	$out .= "\\".str_pad(base_convert(''.$c,10,8), 3, '0', STR_PAD_LEFT);
30	} else {	30	} else {
31	if (chr($c) == "'") $out .= '\\';	31	if (chr($c) == "'") $out .= '\\';
32	$out .= chr($c);	32	$out .= chr($c);
33	}	33	}
34	}	34	}
35	$out .= "'";	35	$out .= "'";
36	return $out;	36	return $out;
37	}	37	}
38		38
39	function c_literal_hexstr($hexstr) {	39	function c_literal_hexstr($hexstr) {
40	$odd_char = (strlen($hexstr)%2 != 0) ? '0x'.substr($hexstr,-1).'<<4' : '';	40	$odd_char = (strlen($hexstr)%2 != 0) ? '0x'.substr($hexstr,-1).'<<4' : '';
41	$hexstr = substr($hexstr,0,2*(int)floor(strlen($hexstr)/2));	41	$hexstr = substr($hexstr,0,2*(int)floor(strlen($hexstr)/2));
42	if ($hexstr != '') {	42	if ($hexstr != '') {
43	$ary = str_split(hex2bin($hexstr));	43	$ary = str_split(hex2bin($hexstr));
44	foreach ($ary as &$a) $a = ord($a);	44	foreach ($ary as &$a) $a = ord($a);
45	return rtrim(c_literal($ary).' '.$odd_char);	45	return rtrim(c_literal($ary).' '.$odd_char);
46	} else {	46	} else {
47	return $odd_char;	47	return $odd_char;
48	}	48	}
49	}	49	}
50		50
51	function generateRandomString($length) {	51	function generateRandomString($length) {
52	// Note: This function can be used in temporary file names, so you	52	// Note: This function can be used in temporary file names, so you
53	// may not generate illegal file name characters.	53	// may not generate illegal file name characters.
54	$characters = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';	54	$characters = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
55	$charactersLength = strlen($characters);	55	$charactersLength = strlen($characters);
56	$randomString = '';	56	$randomString = '';
57	for ($i = 0; $i < $length; $i++) {	57	for ($i = 0; $i < $length; $i++) {
58	$randomString .= $characters[rand(0, $charactersLength - 1)];	58	$randomString .= $characters[rand(0, $charactersLength - 1)];
59	}	59	}
60	return $randomString;	60	return $randomString;
61	}	61	}
62		62
63	function trim_br($html) {	63	function trim_br($html) {
64	$count = 0;	64	$count = 0;
65	do { $html = preg_replace('@^\s<\sbr\s/{0,1}\s>@isU', '', $html, -1, $count); } while ($count > 0); // left trim	65	do { $html = preg_replace('@^\s<\sbr\s/{0,1}\s>@isU', '', $html, -1, $count); } while ($count > 0); // left trim
66	do { $html = preg_replace('@<\sbr\s/{0,1}\s>\s$@isU', '', $html, -1, $count); } while ($count > 0); // right trim	66	do { $html = preg_replace('@<\sbr\s/{0,1}\s>\s$@isU', '', $html, -1, $count); } while ($count > 0); // right trim
67	return $html;	67	return $html;
68	}	68	}
69		69
70	function insertWhitespace($str, $index) {	70	function insertWhitespace($str, $index) {
71	return substr($str, 0, $index) . ' ' . substr($str, $index);	71	return substr($str, 0, $index) . ' ' . substr($str, $index);
72	}	72	}
73		73
74	function js_escape($data) {	74	function js_escape($data) {
75	// TODO.... json_encode??	75	// TODO.... json_encode??
76	$data = str_replace('\\', '\\\\', $data);	76	$data = str_replace('\\', '\\\\', $data);
77	$data = str_replace('\'', '\\\'', $data);	77	$data = str_replace('\'', '\\\'', $data);
78	return "'" . $data . "'";	78	return "'" . $data . "'";
79	}	79	}
80		80
81	function get_calling_function() {	81	function get_calling_function() {
82	$ex = new Exception();	82	$ex = new Exception();
83	$trace = $ex->getTrace();	83	$trace = $ex->getTrace();
84	if (!isset($trace[2])) return '(main)';	84	if (!isset($trace[2])) return '(main)';
85	$final_call = $trace[2];	85	$final_call = $trace[2];
86	return $final_call['file'].':'.$final_call['line'].'/'.$final_call['function'].'()';	86	return $final_call['file'].':'.$final_call['line'].'/'.$final_call['function'].'()';
87	}	87	}
88		88
89	function convert_to_utf8_no_bom($cont) {	89	function convert_to_utf8_no_bom($cont) {
90	$cont = vts_utf8_encode($cont);	90	$cont = vts_utf8_encode($cont);
91		91
92	// Remove BOM	92	// Remove BOM
93	$bom = pack('H*','EFBBBF');	93	$bom = pack('H*','EFBBBF');
94	$cont = preg_replace("/^$bom/", '', $cont);	94	$cont = preg_replace("/^$bom/", '', $cont);
95	return $cont;	95	return $cont;
96	}	96	}
97		97
98	function vts_utf8_encode($text) {	98	function vts_utf8_encode($text) {
99	$enc = mb_detect_encoding($text, null, true);	99	$enc = mb_detect_encoding($text, null, true);
100	if ($enc === false) $enc = mb_detect_encoding($text, ['ASCII', 'UTF-8', 'Windows-1252', 'ISO-8859-1'], true);	100	if ($enc === false) $enc = mb_detect_encoding($text, ['ASCII', 'UTF-8', 'Windows-1252', 'ISO-8859-1'], true);
101	if ($enc === false) $enc = null;	101	if ($enc === false) $enc = null;
102		102
103	if ($enc === 'UTF-8') return $text;	103	if ($enc === 'UTF-8') return $text;
104		104
105	$res = mb_convert_encoding($text, 'UTF-8', $enc);	105	$res = mb_convert_encoding($text, 'UTF-8', $enc);
106	if ($res === false) $res = iconv('UTF-8', 'UTF-8//IGNORE', $text);	106	if ($res === false) $res = iconv('UTF-8', 'UTF-8//IGNORE', $text);
107		107
108	return $res;	108	return $res;
109	}	109	}
110		110
111	function vts_utf8_decode($text) {	111	function vts_utf8_decode($text) {
112	$enc = mb_detect_encoding($text, null, true);	112	$enc = mb_detect_encoding($text, null, true);
113	if ($enc === false) $enc = mb_detect_encoding($text, ['ASCII', 'UTF-8', 'Windows-1252', 'ISO-8859-1'], true);	113	if ($enc === false) $enc = mb_detect_encoding($text, ['ASCII', 'UTF-8', 'Windows-1252', 'ISO-8859-1'], true);
114	if ($enc === false) $enc = null;	114	if ($enc === false) $enc = null;
115		115
116	if ($enc !== 'UTF-8') return $text;	116	if ($enc !== 'UTF-8') return $text;
117		117
118	$res = mb_convert_encoding($text, 'Windows-1252', $enc);	118	$res = mb_convert_encoding($text, 'Windows-1252', $enc);
119	if ($res === false) $res = iconv('Windows-1252', 'Windows-1252//IGNORE', $text);	119	if ($res === false) $res = iconv('Windows-1252', 'Windows-1252//IGNORE', $text);
120		120
121	return $res;	121	return $res;
122	}	122	}
123		123
124	function stripHtmlComments($html) {	124	function stripHtmlComments($html) {
125	// https://stackoverflow.com/questions/11337332/how-to-remove-html-comments-in-php	125	// https://stackoverflow.com/questions/11337332/how-to-remove-html-comments-in-php
126	$html = preg_replace("~<!--(?!<!)[^\[>].*?-->~s", "", $html);	126	$html = preg_replace("~<!--(?!<!)[^\[>].*?-->~s", "", $html);
127	return $html;	127	return $html;
128	}	128	}
129		129
130	function wildcard_is_dir($dir) {	130	function wildcard_is_dir($dir) {
131	// Example usage: if (!wildcard_is_dir(OIDplus::localpath().'plugins/'.'*'.'/design/'.$value)) throw new Exception("Design does not exist")	131	// Example usage: if (!wildcard_is_dir(OIDplus::localpath().'plugins/'.'*'.'/design/'.$value)) throw new Exception("Design does not exist")
132	$dirs = @glob($dir);	132	$dirs = @glob($dir);
133	if ($dirs) foreach ($dirs as $dir) {	133	if ($dirs) foreach ($dirs as $dir) {
134	if (is_dir($dir)) return true;	134	if (is_dir($dir)) return true;
135	}	135	}
136	return false;	136	return false;
137	}	137	}
138		138
139	function isInternetExplorer() {	139	function isInternetExplorer() {
140	// see also includes/oidplus_base.js	-
141	$ua = isset($_SERVER['HTTP_USER_AGENT']) ? $_SERVER['HTTP_USER_AGENT'] : '';	140	$ua = isset($_SERVER['HTTP_USER_AGENT']) ? $_SERVER['HTTP_USER_AGENT'] : '';
142	return ((strpos($ua,'MSIE ') !== false) \|\| (strpos($ua,'Trident/') !== false));	141	return ((strpos($ua,'MSIE ') !== false) \|\| (strpos($ua,'Trident/') !== false));
143	}	142	}
144		143
-		144	if (!function_exists('str_starts_with')) {
-		145	// PHP 7.x compatibility
-		146	// source: Laravel Framework
-		147	// https://github.com/laravel/framework/blob/8.x/src/Illuminate/Support/Str.php
-		148	function str_starts_with($haystack, $needle) {
-		149	return (string)$needle !== '' && strncmp($haystack, $needle, strlen($needle)) === 0;
-		150	}
-		151	}
-		152
145	if (!function_exists('str_ends_with')) {	153	if (!function_exists('str_ends_with')) {
146	// PHP 7.x compatibility	154	// PHP 7.x compatibility
-		155	// source: Laravel Framework
-		156	// https://github.com/laravel/framework/blob/8.x/src/Illuminate/Support/Str.php
147	function str_ends_with($haystack, $needle) {	157	function str_ends_with($haystack, $needle) {
148	$length = strlen($needle);	-
149	return $length > 0 ? substr($haystack, -$length) === $needle : true;	158	return $needle !== '' && substr($haystack, -strlen($needle)) === (string)$needle;
150	}	159	}
151	}	160	}
152		161
153	if (!function_exists('str_starts_with')) {	162	if (!function_exists('str_contains')) {
154	// PHP 7.x compatibility	163	// PHP 7.x compatibility
-		164	// source: Laravel Framework
-		165	// https://github.com/laravel/framework/blob/8.x/src/Illuminate/Support/Str.php
155	function str_starts_with($haystack, $needle) {	166	function str_contains($haystack, $needle) {
156	return strpos($haystack, $needle) === 0;	167	return $needle !== '' && mb_strpos($haystack, $needle) !== false;
157	}	168	}
158	}	169	}
159		170
160	function random_bytes_ex($len, $raw=true, $force_cryptographically_secure=true) {	171	function random_bytes_ex($len, $raw=true, $force_cryptographically_secure=true) {
161	if ($len === 0) return '';	172	if ($len === 0) return '';
162	assert($len > 0);	173	assert($len > 0);
163		174
164	if (function_exists('random_bytes')) {	175	if (function_exists('random_bytes')) {
165	try {	176	try {
166	$a = random_bytes($len);	177	$a = random_bytes($len);
167	} catch (Exception $e) { $a = null; }	178	} catch (Exception $e) { $a = null; }
168	if ($a) return $raw ? $a : bin2hex($a);	179	if ($a) return $raw ? $a : bin2hex($a);
169	}	180	}
170		181
171	if (function_exists('openssl_random_pseudo_bytes')) {	182	if (function_exists('openssl_random_pseudo_bytes')) {
172	try {	183	try {
173	$a = openssl_random_pseudo_bytes($len);	184	$a = openssl_random_pseudo_bytes($len);
174	} catch (Exception $e) { $a = null; }	185	} catch (Exception $e) { $a = null; }
175	if ($a) return $raw ? $a : bin2hex($a);	186	if ($a) return $raw ? $a : bin2hex($a);
176	}	187	}
177		188
178	if (function_exists('mcrypt_create_iv') && defined('MCRYPT_DEV_RANDOM')) {	189	if (function_exists('mcrypt_create_iv') && defined('MCRYPT_DEV_RANDOM')) {
179	try {	190	try {
180	$a = bin2hex(mcrypt_create_iv($len, MCRYPT_DEV_RANDOM));	191	$a = bin2hex(mcrypt_create_iv($len, MCRYPT_DEV_RANDOM));
181	} catch (Exception $e) { $a = null; }	192	} catch (Exception $e) { $a = null; }
182	if ($a) return $raw ? $a : bin2hex($a);	193	if ($a) return $raw ? $a : bin2hex($a);
183	}	194	}
184		195
185	if ($force_cryptographically_secure) {	196	if ($force_cryptographically_secure) {
186	$msg = 'Cannot find a fitting Cryptographically Secure Random Number Generator (CSRNG).';	197	$msg = 'Cannot find a fitting Cryptographically Secure Random Number Generator (CSRNG).';
187	if (version_compare(PHP_VERSION, '8.2.0') >= 0) {	198	if (version_compare(PHP_VERSION, '8.2.0') >= 0) {
188	throw new \Random\RandomException($msg);	199	throw new \Random\RandomException($msg);
189	} else {	200	} else {
190	throw new \Exception($msg);	201	throw new \Exception($msg);
191	}	202	}
192	}	203	}
193		204
194	if (function_exists('mcrypt_create_iv') && defined('MCRYPT_DEV_URANDOM')) {	205	if (function_exists('mcrypt_create_iv') && defined('MCRYPT_DEV_URANDOM')) {
195	// /dev/urandom uses the same entropy pool than /dev/random, but if there is not enough data	206	// /dev/urandom uses the same entropy pool than /dev/random, but if there is not enough data
196	// then the security is lowered.	207	// then the security is lowered.
197	try {	208	try {
198	$a = bin2hex(mcrypt_create_iv($len, MCRYPT_DEV_URANDOM));	209	$a = bin2hex(mcrypt_create_iv($len, MCRYPT_DEV_URANDOM));
199	} catch (Exception $e) { $a = null; }	210	} catch (Exception $e) { $a = null; }
200	if ($a) return $raw ? $a : bin2hex($a);	211	if ($a) return $raw ? $a : bin2hex($a);
201	}	212	}
202		213
203	if (function_exists('mcrypt_create_iv') && defined('MCRYPT_RAND')) {	214	if (function_exists('mcrypt_create_iv') && defined('MCRYPT_RAND')) {
204	try {	215	try {
205	$a = bin2hex(mcrypt_create_iv($len, MCRYPT_RAND));	216	$a = bin2hex(mcrypt_create_iv($len, MCRYPT_RAND));
206	} catch (Exception $e) { $a = null; }	217	} catch (Exception $e) { $a = null; }
207	if ($a) return $raw ? $a : bin2hex($a);	218	if ($a) return $raw ? $a : bin2hex($a);
208	}	219	}
209		220
210	// Fallback to non-secure RNG	221	// Fallback to non-secure RNG
211	$a = '';	222	$a = '';
212	while (strlen($a) < $len*2) {	223	while (strlen($a) < $len*2) {
213	$a .= sha1(uniqid((string)mt_rand(), true));	224	$a .= sha1(uniqid((string)mt_rand(), true));
214	}	225	}
215	$a = substr($a, 0, $len*2);	226	$a = substr($a, 0, $len*2);
216	return $raw ? hex2bin($a) : $a;	227	return $raw ? hex2bin($a) : $a;
217	}	228	}
218		229