How can you check if a parameter is passed in a PHP script using $_GET?

To check if a parameter is passed in a PHP script using $_GET, you can use the isset() function to determine if the parameter exists in the $_GET superglobal array. If isset() returns true, then the parameter has been passed. 

if(isset($_GET['parameter_name'])) {
    // Parameter is passed, do something with it
    $parameter_value = $_GET['parameter_name'];
} else {
    // Parameter is not passed
    echo "Parameter is not passed";
}

Keywords

PHP $_GET isset() parameter validation

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