hash.php

    public static function generateHash($value, $namespace = '')
    {
        $hash = hash_init('sha256');
        $queue = array(array($namespace => $value));
        for ($i = 0; isset($queue[$i]); ++$i) {
            foreach ($queue[$i] as $k => $v) {
                if (is_object($v)) {
                    hash_update($hash, $k.'=>'.spl_object_hash($v).',';
                } elseif (is_array($v)) {
                    $queue[] = $v;
                } else {
                    hash_update($hash, $k.'=>'.$v.',');
                }   
            }   
            unset($queue[$i]); 
            hash_update($hash, "\n");
        }   
        
        return hash_final($hash);
    }

hash2.php

    public static function generateHash($value, $namespace = '')
    {
        $queue = array(array($namespace => $value));
        for ($i = 0; isset($queue[$i]); ++$i) {
            foreach ($queue[$i] as $k => $v) {
                if (is_object($v)) {
                    $queue[$i][$k] = spl_object_hash($v);
                } elseif (is_array($v)) {
                    unset($queue[$i][$k]);
                    $queue[] = $v;
                }
            }
        }
        
        return hash('sha256', serialize($queue));
    }