PHP, Wordpress - How can I pass Variables within a File? - php

Question

I integrated a PHP file in my Wordpress installation with a plugin. I have found out, how I am able to send several variables and posting them to a MySQL database, but I am confused, how to manipulate my data like this:
$web = "http://internal.weddingcenter.at/wp-content/themes/twentytwelve/orders.php";
a href="<? echo ''.$web.'?contact='.$daten[id].'' ?>">Rechnung</a>
if ($contact) {
$datum = date('Y-m-d', $date);
$sql_update = "Update wccrm_orders set contacted_date = $datum where id = $contact";
$result = mysql_query($sql_update, $db);
}
I never jump into the if-clause.
How can this be solved?

Answer 1

It has to be :
if($_GET['contact'])
...
OR You cant try :
$contact = $_GET['contact'];
if($_GET['contact'])
...

Answer 2

To add to Kunal Gupta I can see more problems...
if ($_GET['contact']) {
//Forgot to mention SQL injection prevention...
//Try preg_replace or mysqli_real_escape_string()
$datum = preg_replace('[0-9 \/]', '', date('Y-m-d',$date)); //I think that will work
//OR
$test = date('Y-m-d', $date);
$datum = mysqli_real_escape_string($test); //Should also work...
//You must always place PHP variables in inverted commas
$sql_update = "UPDATE wccrm_orders SET contacted_date='$datum' WHERE id='$contact'";
//use MySQLi... It's quicker. Use the variables this way around
$result = mysqli_query($db, $sql_update);
}
There are still quite a few problems with the code but without fully understanding what data is coming from the previous page or what you intend to do with the data I can only help so much.