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phpurlgetquery-string

How to read GET URL parameter?

I'm trying to pass a URL as a URL parameter in PHP but when I try to get this parameter I get nothing

I'm using the following URL form:

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

  • $_GET is not a function or language construct—it's just a variable (an array). Try:

    <?php
echo $_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:

    <?php
if (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:

    <?php
echo 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';