Ok, so I have an id passed from the previous page

$_GET['id'];

I want to check if the id has been set first, and if so, then echo the following code :

EDIT: please also look at

EDIT2: 

 $with = (isset($_GET['with']) && !empty($_GET['with'])) ? '<iframe type="text/html" width="540" height="385" src=" 'frameborder="0"> </iframe>' : false;

I tried this but didn't work.

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2 Answers

Check if variable set and echo the code if it is

<?php if(isset($_GET['id'])):?> <iframe type="text/html" width="540" height="385" src=" echo $_GET['id']; ?>" frameborder="0"> </iframe> <?php endif ?>
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You can use the following - the isset will check if the variable is set (as in it exists) and !empty to ensure that the variable actually has data in it:

if(isset($_GET['id']) && !empty($_GET['id'])) { // You code here. }

Edit: I would do something like this:

$myID = (isset($_GET['id']) && !empty($_GET['id'])) ? ' : false; echo ($myID) ? $myID : "";

The first part will do a ternary operator and if (isset($_GET['id']) && !empty($_GET['id'])) evaluates to true, it will assign $myID the value of your link and the ID from the GET. If not, it will assign a false boolean.

The next line uses another ternary and if $myID is false, outputs an empty string, otherwise it displays the full link.

Edit 2: Try this:

echo (isset($_GET['with']) && !empty($_GET['with'])) ? '<iframe type="text/html" width="540" height="385" src=" 'frameborder="0"></iframe>' : false;

Edit 3: A deceze correctly points out: The !empty function will by default call the isset function first - meaning that if it isn't set, it cannot pass a !empty function with anyting else than false.

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