GET URL parameter in PHP
$_GET is not a function or language construct—it's just a variable (an array). Try:
<?phpecho $_GET['link'];In particular, it's a superglobal: a built-in variable that's populated by PHP and is available in all scopes (you can use it from inside a function without the global keyword).
Since the variable might not exist, you could (and should) ensure your code does not trigger notices with:
<?phpif (isset($_GET['link'])) { echo $_GET['link'];} else { // Fallback behaviour goes here}Alternatively, if you want to skip manual index checks and maybe add further validations you can use the filter extension:
<?phpecho filter_input(INPUT_GET, 'link', FILTER_SANITIZE_URL);Last but not least, you can use the null coalescing operator (available since PHP/7.0) to handle missing parameters:
echo $_GET['link'] ?? 'Fallback value';