<?php

        function linearSearch(array $array, $value) {
        $length=count($array);
        $s = null;
        for ($i=0;$i<$length;$i++) {
        if($array[$i] == $value){
              $s= $i;
              break;
        }
    }
return $s;
}
 
var_dump(linearSearch([31,
41,
59,
2,
6,
41,
59,
58], 59));