* boolean: b:1;
* integer: i:1;
* double: d:0.2;
* string: s:4:"test";
* array: a:3:{i:0;i:1;i:1;i:2;i:2;i:3;}
* object: O:8:"stdClass":0:{}
* null: N;
*
*
* @author Chris Smith
* @copyright Copyright (c) 2009 Chris Smith (http://www.cs278.org/)
* @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 ($value === 'b:0;')
{
$result = false;
return true;
}
$length = strlen($value);
$end = '';
switch ($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;
}