递归php函数检查是否找到值然后生成唯一值

Question

I always got a loop, when I run my code.

This is the code that I tried.

//ARRAY VALUES
$array = array();
$array[] = "201310656";
$array[] = "201310657";
$array[] = "201310658";
$array[] = "201310659";



function check ($array,$search){
    //IF FOUND
    if (in_array($search, $array)) {

        $search = intval($search);
                //+1 In Original Value If Found
        $search += 1;
        recheck($array,$search);

        return $unique_value;
    }
    //IF NOTFOUND RETURN ORIGINAL INPUT
    else{
        return $search;
    }

}
$unique_value = check($array,"201310659");

The results I wanted to attain is if the value exists recheck the array until output the unique value.