public static function is($data)
{
// If it isn't a string, it isn't serialized
if (!is_string($data)) {
return false;
}
$data = trim($data);
// Is it the serialized NULL value?
if ($data === 'N;') {
return true;
} elseif ($data === 'b:0;' || $data === 'b:1;') {
// Is it a serialized boolean?
return true;
}
$length = strlen($data);
// Check some basic requirements of all serialized strings
if (self::_checkBasic($data, $length)) {
return false;
}
return @unserialize($data) !== false;
}