将JavaScript转换为PHP

Question

I am new to PHP and I'm trying to convert a simple Javascript function into a PHP function. I need help converting this code to PHP. thanks so much

var intArrayToHexString = function(arr) {
              var hex = "";
              for (var i = 0; i < arr.length; i++) {
                if (arr[i] < 16)      
                hex += "0";
                hex += arr[i].toString(16);
              }
              return hex;
            };

PHP code: to php, this is what I've tried:

function intArrayToHexString($arr) {
              $hex = "";
              for ($i = 0; $i < strlen($arr); $i++) {
                if ($arr[$i] < 16)     
                $hex .= "0";
                $hex .= $arr[$i];
              }
              return $hex;
            };

PHP code does not work. Help me please.

Answer 1

In php you use '.' to concatinate in stead of a '+'

$hex .= "0"; $hex .= $arr[$i];