How to convert JavaScript code into PHP code

Convert JS code to PHP code & lt; script & nbsp; type = "text/javascript" & gt; function & nbsp; rightSide (playerID) & nbsp ;{& nbsp; & nbsp; & nbsp; this JS code is converted to PHP code

 
  
function rightSide(playerID) {
  
    this.Decrypt2 = function(data) {
  
        var b = (7 * (data - 6) % 10 + 10) % 10;
  
        return b.toString();
  
alert(b.toString());
  
    }
  

  
    this.Decrypt = function(playerID) {
  
        playerID = playerID.toString();
  
        var arrID = new Array();
  
        for (var i = 0; i < playerID.length; i = i + 1) {
  
            var a = playerID.substr(i, 1);
  

  
            switch (a) {
  
                case "0": arrID.push(this.Decrypt2(0)); break;
  
                case "4": arrID.push(this.Decrypt2(1)); break;
  
                case "5": arrID.push(this.Decrypt2(2)); break;
  
                case "3": arrID.push(this.Decrypt2(3)); break;
  
                case "6": arrID.push(this.Decrypt2(4)); break;
  
                case "9": arrID.push(this.Decrypt2(5)); break;
  
                case "7": arrID.push(this.Decrypt2(6)); break;
  
                case "1": arrID.push(this.Decrypt2(7)); break;
  
                case "2": arrID.push(this.Decrypt2(8)); break;
  
                case "8": arrID.push(this.Decrypt2(9)); break;
  
            }
  
        }
  
        return arrID.join('');
  
    }
  
return this.Decrypt(playerID);
  
}
  
var idArr = rightSide(5705);
 

The above JS code can be converted into PHP code. thank you !!! Shared to: function? RightSide (playerID )? {???? This. Decrypt2? =? Functi... 'data-pics = ''>
------ Solution --------------------
Literal translation by php closure (required> = php 5.3)

function rightSide($playerID) {
    $Decrypt2 = function($data) {
        $b = (7 * ($data - 6) % 10 + 10) % 10;
        return $b;
    };
 
    $Decrypt = function($playerID) use ($Decrypt2) {
        $playerID = "$playerID";
        $arrID = Array();
        for ($i = 0; $i < strlen($playerID); $i = $i + 1) {
            $a = substr($playerID, $i, 1);
 
            switch ($a) {
                case "0": $arrID[] = $Decrypt2(0); break;
                case "4": $arrID[] = $Decrypt2(1); break;
                case "5": $arrID[] = $Decrypt2(2); break;
                case "3": $arrID[] = $Decrypt2(3); break;
                case "6": $arrID[] = $Decrypt2(4); break;
                case "9": $arrID[] = $Decrypt2(5); break;
                case "7": $arrID[] = $Decrypt2(6); break;
                case "1": $arrID[] = $Decrypt2(7); break;