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).'"';