isset PHP isset($_GET['something']) ? $_GET['something'] : ''

In PHP, isset() is a function that determines whether a variable is set and is not NULL. The syntax for using isset() is isset(var), where var is the name of the variable you want to check.

The code you provided uses the ternary operator ? : to check if $_GET['something'] is set. If it is set, the value of $_GET['something'] is returned. If it is not set, an empty string is returned.

Here is an example of how this code could be used:

Example of isset() function syntax in PHP

<?php

$something = isset($_GET['something']) ? $_GET['something'] : '';
echo $something; // will echo nothing on the screen

If $_GET['something'] is set, the value of $something will be the value of $_GET['something']. If $_GET['something'] is not set, $something will be an empty string.