What best practices should be followed when handling form submissions in PHP to avoid errors like undefined variables?

When handling form submissions in PHP, it is important to check if the form variables are set before using them to avoid errors like undefined variables. One way to do this is by using the isset() function to verify if the form variables exist before accessing their values. 

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

Keywords

PHP form submissions error handling undefined variables validation.

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