src/Zend/Filter/Encrypt/Mcrypt.php
protected function _srand()
    {
        if (version_compare(PHP_VERSION, '5.3.0', '>=')) {
            return;
        }

        if (!self::$_srandCalled) {
            srand((double) microtime() * 1000000);
            self::$_srandCalled = true;
        }
    }
protected function _srand()
    {
        if (version_compare(PHP_VERSION, '5.3.0', '>=')) {
            return;
        }

        if (!self::$_srandCalled) {
            srand((double) microtime() * 1000000);
            self::$_srandCalled = true;
        }
    }
_srand() interception

@see ZF-8742