How can warnings be avoided when a PHP script does not receive certain parameters?

When a PHP script does not receive certain parameters, warnings can be avoided by checking if the parameters are set using the isset() function before trying to use them in the script. This helps prevent PHP from throwing warnings about undefined variables. 

if(isset($_POST['parameter_name'])) {
    // Use the parameter here
} else {
    // Handle the case when the parameter is not set
}

Keywords

PHP error handling isset() empty() strict typing

Related Questions