How can the isset() function be used to improve the form submission handling in PHP code?

When handling form submissions in PHP, it's important to check if the form fields are set before processing them to avoid undefined index errors. The isset() function can be used to determine if a variable is set and not null, providing a way to safely handle form submissions without encountering errors. 

if(isset($_POST['submit'])){
    // Process form data here
    $username = isset($_POST['username']) ? $_POST['username'] : '';
    $email = isset($_POST['email']) ? $_POST['email'] : '';
    
    // Continue processing the form data
}

Keywords

isset form submission PHP code handling function

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