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PHP is_serialized() function.
<?php
/**
* This program is free software. It comes without any warranty, to
* the extent permitted by applicable law. You can redistribute it
* and/or modify it under the terms of the Do What The Fuck You Want
* To Public License, Version 2, as published by Sam Hocevar. See
* http://sam.zoy.org/wtfpl/COPYING for more details.
*/
/**
* Thanks to Chris for great solution, i have add only small changes
*/
/**
* Tests if an input is valid PHP serialized string.
*
* Checks if a string is serialized using quick string manipulation
* to throw out obviously incorrect strings. Unserialize is then run
* on the string to perform the final verification.
*
* Valid serialized forms are the following:
* <ul>
* <li>boolean: <code>b:1;</code></li>
* <li>integer: <code>i:1;</code></li>
* <li>double: <code>d:0.2;</code></li>
* <li>string: <code>s:4:"test";</code></li>
* <li>array: <code>a:3:{i:0;i:1;i:1;i:2;i:2;i:3;}</code></li>
* <li>object: <code>O:8:"stdClass":0:{}</code></li>
* <li>null: <code>N;</code></li>
* </ul>
*
* @author Chris Smith <code+php@chris.cs278.org>, Frank Bültge <frank@bueltge.de>
* @copyright Copyright (c) 2009 Chris Smith (http://www.cs278.org/), 2011 Frank Bültge (http://bueltge.de)
* @license http://sam.zoy.org/wtfpl/ WTFPL
* @param string $value Value to test for serialized form
* @param mixed $result Result of unserialize() of the $value
* @return boolean True if $value is serialized data, otherwise FALSE
*/
function is_serialized( $value, &$result = null ) {
// Bit of a give away this one
if ( ! is_string( $value ) ) {
return FALSE;
}
// Serialized FALSE, return TRUE. unserialize() returns FALSE on an
// invalid string or it could return FALSE if the string is serialized
// FALSE, eliminate that possibility.
if ( 'b:0;' === $value ) {
$result = FALSE;
return TRUE;
}
$length = strlen($value);
$end = '';
if ( isset( $value[0] ) ) {
switch ($value[0]) {
case 's':
if ( '"' !== $value[$length - 2] )
return FALSE;
case 'b':
case 'i':
case 'd':
// This looks odd but it is quicker than isset()ing
$end .= ';';
case 'a':
case 'O':
$end .= '}';
if ( ':' !== $value[1] )
return FALSE;
switch ( $value[2] ) {
case 0:
case 1:
case 2:
case 3:
case 4:
case 5:
case 6:
case 7:
case 8:
case 9:
break;
default:
return FALSE;
}
case 'N':
$end .= ';';
if ( $value[$length - 1] !== $end[0] )
return FALSE;
break;
default:
return FALSE;
}
}
if ( ( $result = @unserialize($value) ) === FALSE ) {
$result = null;
return FALSE;
}
return TRUE;
}
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