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<?php
namespace Imagely\NGG\Util;
class Serializable {
/**
* Serializes the data
*
* @param mixed $value
* @return string
*/
public static function serialize( $value ) {
// Try encoding using JSON. It's usually Unicode safe but still, sometimes trips over things.
$serialized = @\json_encode( $value );
if ( ! $serialized ) {
$serialized = \preg_replace( '/[\x00-\x08\x0B\x0C\x0E-\x1F\x7F-\x9F]/u', '', $value );
$serialized = @\json_encode( $serialized );
}
// Using json_encode here because PHP's serialize is not Unicode safe.
return \base64_encode( $serialized );
}
/**
* Unserializes data using our proprietary format
*
* @throws \Exception This method will not unserialize any objects
* @param string $value
* @return mixed
*/
public static function unserialize( $value ) {
$retval = null;
if ( \is_string( $value ) ) {
$retval = \stripcslashes( $value );
if ( \strlen( $value ) > 1 ) {
// We can't always rely on base64_decode() or json_decode() to return FALSE as their documentation
// claims so check if $retval begins with a: as that indicates we have a serialized PHP object.
if ( \strpos( $retval, 'a:' ) === 0 ) {
if ( self::check_for_serialized_objects( $value ) ) {
throw new \Exception( \__( 'NextGEN Gallery will not unserialize data with objects', 'nggallery' ) );
}
// Record this for later.
$er = \error_reporting( 0 );
// The second parameter was added by PHP 7.0.
if ( \version_compare( \phpversion(), '7.0', '>=' ) ) {
$retval = \unserialize( $value, [ 'allowed_classes' => false ] );
} else {
$retval = \unserialize( $value );
}
// Restore error reporting level.
\error_reporting( $er );
} else {
// We use json_decode() here because PHP's unserialize() is not Unicode safe.
$retval = \json_decode( \base64_decode( $retval ), true );
}
}
}
return $retval;
}
/**
* Determines if a string may hold a serialized PHP object
*
* @param $string
* @return bool
*/
public static function check_for_serialized_objects( $string ) {
if ( ! \is_string( $string ) ) {
return false;
}
$string = \trim( $string );
return (bool) \preg_match( '/(O|C):\+?[0-9]+:/is', $string );
}
}