php根据条件排除,该如何解决

$a = "'你好(39)','你好啊(60)','他好(52)','他好啊(23)','我好(80)','我好啊(99)'";

$a = "'你好(39)','你好啊(60)','他好(52)','他好啊(23)','我好(80)','我好啊(99)'";

$arr = explode('\',\'', trim($a, '\''));

$newArr = array();

foreach ($arr as &$value) {

    if (preg_match('/[\d]+/', $value, $match)) {

        if (isset($match[0])) {

            if ($match[0] > 50) {

                $newArr[] = '\''.$value.'\'';

            }

        }

    }

}



echo '"'.implode(',',$newArr).'"';