What does this php code mean exactly?

$itemid = (isset($_GET['Itemid'])) ? $_GET['Itemid'] : null;

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my guess is it checks if $_GET['Itemid']) is defined it gets it's value to $itemid ,otherwise $itemid = null.
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Brian TaoSenior Business Solutions ConsultantCommented:
You're correct.
$_GET is the array of parameters from the HTTP GET request.
isset is very straight forward, just like its name, and checks if something has been set.
The "xxx?aaa:bbb" is a trinary operator which returns aaa when xxx evaluates to true and bbb otherwise.

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Marco GasiFreelancerCommented:
Chris StanyonWebDevCommented:
It's a ternary operator and is often used as a shortcut for a very simple if/else statement. You could write it out in full like so:

if (isset($_GET['Itemid'])) {
    $itemid = $_GET['Itemid'];
} else {
    $itemid = null;

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isset() checks to see if a variable has been set, and is often used to prevent the warnings generated by trying to reference an undefined variable
aboo_sAuthor Commented:
Thank you all.
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