EmptyKeyEncoding.php

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<?php
namespace Elgg\Json;

class EmptyKeyEncoding {

    protected $token;

    public function __construct($empty_key = '') {
        if (!$empty_key) {
            $empty_key = sha1(microtime(true) . mt_rand());
        }
        $this->token = $empty_key;
    }

    public function getEmptyKey() {
        return $this->token;
    }

    public function decode($json, $assoc = false, $depth = 512, $options = 0) {
        // Replace empty keys with the unique token
        $json = preg_replace('~([^"\\\\])""\\s*\\:~', "$1\"{$this->token}\":", $json, -1, $count);

        return json_decode($json, $assoc, $depth, $options);
    }

    public function encode($value, $options = 0, $depth = 512) {
        if ($depth == 512) {
            // PHP 5.4 and earlier will choke if depth is passed in
            $json = json_encode($value, $options);
        } else {
            $json = json_encode($value, $options, $depth);
        }

        // Replace unique tokens with empty strings
        if (is_string($json)) {
            $json = str_replace("\"{$this->token}\"", '""', $json);
        }

        return $json;
    }
}