What are the best practices for passing variables through a URI in PHP?

When passing variables through a URI in PHP, it is important to properly sanitize and validate the input to prevent security vulnerabilities such as SQL injection or cross-site scripting attacks. One common approach is to use the `urlencode()` function to encode the variables before appending them to the URI. Additionally, it is recommended to use the `$_GET` superglobal to retrieve the variables from the URI. 

// Encode the variable before passing it through the URI
$variable = urlencode($variable);

// Append the variable to the URI
$url = "example.com/page.php?variable=" . $variable;

// Retrieve the variable from the URI using $_GET
$received_variable = $_GET['variable'];

Keywords

URL encoding GET parameters POST requests security vulnerabilities validation.

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