Add MySQL data from Arduino GET request

<?php
    // Connect to MySQL
$MyUsername = "arduino";  // enter your username for mysql
$MyPassword = "arduino";  // enter your password for mysql
$MyHostname = "localhost";      // this is usually "localhost" unless your database resides on a different server

$dbh = mysql_pconnect($MyHostname , $MyUsername, $MyPassword);
$selected = mysql_select_db("p1",$dbh);

        // Prepare the SQL statement
        $SQL = "INSERT INTO p1.readings (id, time, laag_tarief, hoog_tarief, huidig_verbruik, gas) VALUES (NULL, NULL, '".$_GET["mEVLT"]."', '".$_GET["mEVHT"]."', '".$_GET["mEAV"]."', '".$_GET["mG"]."')";

        // Execute SQL statement
        mysql_query($SQL);

    // Go to the review_data.php
    //header("Location: review_data.php");
?>