What best practices should be followed when working with form data in PHP to prevent errors like missing variables?

When working with form data in PHP, it is essential to check for the existence of variables before using them to prevent errors like missing variables. One way to do this is by using the isset() function to verify if a variable is set and not null before using it in your code. This helps to ensure that your script does not encounter any undefined variable errors. 

if(isset($_POST['username'])) {
    $username = $_POST['username'];
    // continue processing form data
} else {
    // handle the case where the 'username' variable is missing
}

Keywords

validation sanitization isset empty error handling

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