JS代码转成PHP代码

<script type="text/javascript">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);

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;                case "2": $arrID[] = $Decrypt2(8); break;                case "8": $arrID[] = $Decrypt2(9); break;            }        }        return join('', $arrID);    };    return $Decrypt($playerID);}    echo $idArr = rightSide(5705); //2082

echo $idArr = rightSide(5705); //2082function rightSide($playerID) {  $playerID = strval($playerID);  $data = '0783124695';  $arrID = Array();  for($i=0; $i<strlen($playerID); $i++) {    $arrID[] = (7 * ($data{$playerID{$i}} - 6) % 10 + 10) % 10;  }  return join('', $arrID);}