Protection of your PHP environment

important.php

<?PHP
// If you GET/POST/REQUEST variables from extern
// Do not forget to protect them from overriding
if( !isset($_GET["test1"]) &&
    !isset($_POST["test2"]) &&
    !isset($_REQUEST["test3"])) { $test1 = htmlentities($_GET["test1"]);
                                  $test2 = htmlentities($_POST["test2"]); 
                                  $test3 = htmlentities($_REQUEST["test3"]);  }

// If you use extern variables in MYSQL please
// do not forget to protect the query

$test1_escaped = mysqli_real_escape_string($_SOCKET, $test1);
$test2_escaped = mysqli_real_escape_string($_SOCKET, $test2);
$test3_escaped = mysqli_real_escape_string($_SOCKET, $test3);

$query = mysqli_query($_SOCKET, "SELECT id, name, text FROM data WHERE id = '".$test1."' .... ORDER BY id");
?>