Utility.php

<?php
class Utility
{
    /* --------------------------------------------------------------------------------*
     |                              Serialize Helper                                   |
     |                                                                                 |
     | Custom From WordPress Core wp-includes/functions.php                            |
     |---------------------------------------------------------------------------------|
     */

    /**
     * Serialize data, if needed. @uses for ( uncompress serialize values )
     *
     * @param  mixed $data Data that might be serialized.
     * @return mixed A scalar data
     */
    public static function maybeSerialize($data)
    {
        if (is_array($data) || is_object($data)) {
            return @serialize($data);
        }

        // Double serialization is required for backward compatibility.
        if (static::isSerialized($data, false)) {
            return serialize($data);
        }

        return $data;
    }

    /**
     * Unserialize value only if it was serialized.
     *
     * @param  string $original Maybe unserialized original, if is needed.
     * @return mixed  Unserialized data can be any type.
     */
    public static function maybeUnserialize($original)
    {
        // don't attempt to unserialize data that wasn't serialized going in
        if (static::isSerialized($original)) {
            return @unserialize($original);
        }

        return $original;
    }

    /**
     * Check value to find if it was serialized.
     * If $data is not an string, then returned value will always be false.
     * Serialized data is always a string.
     *
     * @param  mixed $data   Value to check to see if was serialized.
     * @param  bool  $strict Optional. Whether to be strict about the end of the string. Defaults true.
     * @return bool  False if not serialized and true if it was.
     */
    public static function isSerialized($data, $strict = true)
    {
        /* if it isn't a string, it isn't serialized
         ------------------------------------------- */
        if (! is_string($data)) {
            return false;
        }

        $data = trim($data);

        if ('N;' == $data) {
            return true;
        }

        if (strlen($data) < 4 || ':' !== $data[1]) {
            return false;
        }

        if ($strict) {
            $lastc = substr($data, -1);
            if (';' !== $lastc && '}' !== $lastc) {
                return false;
            }
        } else {
            $semicolon = strpos($data, ';');
            $brace     = strpos($data, '}');

            // Either ; or } must exist.
            if (false === $semicolon && false === $brace
                || false !== $semicolon && $semicolon < 3
                || false !== $brace && $brace < 4
            ) {
                return false;
            }
        }

        $token = $data[0];
        switch ($token) {
            /** @noinspection PhpMissingBreakStatementInspection */
            case 's':
                if ($strict) {
                    if ('"' !== substr($data, -2, 1)) {
                        return false;
                    }
                } elseif (false === strpos($data, '"')) {
                    return false;
                }
            // or else fall through
            case 'a':
            case 'O':
                return (bool) preg_match("/^{$token}:[0-9]+:/s", $data);

            case 'b':
            case 'i':
            case 'd':
                $end = $strict ? '$' : '';

                return (bool) preg_match("/^{$token}:[0-9.E-]+;$end/", $data);
        }

        return false;
    }
}