How can the presence of returned results be checked in PHP form processing?

When processing a form in PHP, you can check if there are any returned results by using the isset() function on the form input fields. This function checks if a variable is set and is not NULL. By checking if the form input fields are set, you can determine if the form has been submitted and process the data accordingly. 

if(isset($_POST['submit'])) {
    // Form has been submitted
    // Process the form data here
} else {
    // Form has not been submitted
    // Display the form for user input
}

Keywords

PHP form processing returned results error handling validation

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