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Edit File: Php55.php

<?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier <fabien@symfony.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Symfony\Polyfill\Php55;

/**
 * @internal
 */
final class Php55
{
    public static function boolval($val)
    {
        return (bool) $val;
    }

public static function json_last_error_msg()
    {
        switch (json_last_error()) {
            case JSON_ERROR_NONE: return 'No error';
            case JSON_ERROR_DEPTH: return 'Maximum stack depth exceeded';
            case JSON_ERROR_STATE_MISMATCH: return 'State mismatch (invalid or malformed JSON)';
            case JSON_ERROR_CTRL_CHAR: return 'Control character error, possibly incorrectly encoded';
            case JSON_ERROR_SYNTAX: return 'Syntax error';
            case JSON_ERROR_UTF8: return 'Malformed UTF-8 characters, possibly incorrectly encoded';
            default: return 'Unknown error';
        }
    }

/**
     * @author Sebastiaan Stok <s.stok@rollerscapes.net>
     */
    public static function hash_pbkdf2($algorithm, $password, $salt, $iterations, $length = 0, $rawOutput = false)
    {
        // Number of blocks needed to create the derived key
        $blocks = ceil($length / strlen(hash($algorithm, null, true)));
        $digest = '';

for ($i = 1; $i <= $blocks; ++$i) {
            $ib = $block = hash_hmac($algorithm, $salt.pack('N', $i), $password, true);

// Iterations
            for ($j = 1; $j < $iterations; ++$j) {
                $ib ^= ($block = hash_hmac($algorithm, $block, $password, true));
            }

$digest .= $ib;
        }

if (!$rawOutput) {
            $digest = bin2hex($digest);
        }

return substr($digest, 0, $length);
    }
}