How Do I Retrieve URL Parameters in PHP?

Retrieving URL Parameters in PHP

In PHP, you can pass parameters in a URL using the ? character followed by the parameter name and value, e.g.:

http://localhost/dispatch.php?link=www.google.com

To retrieve a specific parameter value, you can access the $_GET superglobal array, which contains all GET parameters from the URL. To access the link parameter from the example URL, use:

echo $_GET['link'];

However, this code may fail if the link parameter is not present in the URL. To avoid this, use:

if (isset($_GET['link'])) {
    echo $_GET['link'];
} else {
    // Handle missing parameter
}

Alternatively, use the filter_input() function for parameter retrieval:

echo filter_input(INPUT_GET, 'link', FILTER_SANITIZE_URL);

Or, since PHP 7.0, use the null coalescing operator:

echo $_GET['link'] ?? 'Fallback value';

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