What is the difference between $REQUEST_URI and $QUERY_STRING in PHP when accessing GET parameters?

When accessing GET parameters in PHP, $REQUEST_URI contains the full URI of the current request, including the query string, while $QUERY_STRING contains only the query string part of the URI. If you want to access and parse GET parameters separately, it is recommended to use $_GET superglobal array which directly provides access to the GET parameters. 

// Accessing GET parameters using $_GET superglobal array
if(isset($_GET['param_name'])) {
    $param_value = $_GET['param_name'];
    // do something with $param_value
}

Keywords

$REQUEST_URI $QUERY_STRING PHP GET parameters difference

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