Delete a post based upon an id variable - different user sessions - php

Question

SOLVED
I have a problem that has been tearing me apart for the last two weeks.
I want to be able to delete a post in my table based upon a given variable. Because of the different user content it's pretty difficult to delete a post that belongs to that certain user.
What I really want to know is how to get that certain ID from $rad on the admin.php to the delete query on perform_remove_time.php. Should I use GET or POST or any other method? I will have "input sanitize" with real_escape_string later on and I'm also aware of mysqli vs mysql. My code isn't pretty please bear with me.
From perform_remove_time.php
<?
$user_id = $_SESSION['user_id'];
$time_id = ($_GET['time_id']);
$sql = "DELETE FROM time WHERE time_id = '$time_id' AND user_id = '$user_id'";
$result = mysql_query($sql);
if($result) {
echo "<h3>Time deleted!</h3>";
header("location:admin.php");
} else {
echo "Something is wrong!";
}
?>
This is where the posts is fetched and displayed - admin.php
$user_id = $_SESSION['user_id'];
$time_id = ($_GET['time_id']);
$sql = "SELECT * FROM time WHERE user_id = '$user_id' ORDER BY time_id DESC";
$result = mysql_db_query("database","$sql") or die (mysql_error());
while ($rad=mysql_fetch_array($result)) {
?>
<?='Work session: '.$rad["time_id"]?> | Time on projekt: <?=$rad["hours"]?> | Delete work session
Also from admin.php further up on the page
if (!isset($_SESSION['user'])) {
header("Location:default.php");
die();
}

Answer 1

From my observation, your delete link in 'admin.php' would not get you to 'perform_remove_time.php' with the right GET parameter (time_id) for your delete code to work.
So i made a little modification to your delete link:
<? echo "<a href='perform_remove_time.php?time_id=".$rad['time_id']."'> | Delete work session</a>"; ?>
That modification would enable your delete link get to 'perform_remove_time.php' with the right GET parameter for it to work
Update
The code snippet from perform_remove_time.php looks fine to me, and would work as long as $time_id and $user_id contains valid values and also if your sql statement is correct. Now, from the code snippet you posted, I discovered that in perform_remove_time.php $time_id would contain nothing because there was no time_id GET parameter in your delete link code | Delete work session, the GET Parameter there is id, so I simply changed id to time_id to get things working.
new delete link code
<? echo "<a href='perform_remove_time.php?time_id=".$rad['time_id']."'> | Delete work session</a>"; ?>