What common errors can occur when handling form submissions in PHP, as seen in the provided code snippet?

One common error when handling form submissions in PHP is not checking if the form has been submitted before accessing its values. This can lead to undefined index errors if the form is accessed directly without submission. To solve this, always check if the form has been submitted using the isset() function before accessing form values. 

<?php
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    if(isset($_POST['submit'])) {
        // Process form data
        $name = $_POST['name'];
        $email = $_POST['email'];
        // Continue with form processing
    } else {
        echo "Form not submitted.";
    }
}
?>

Keywords

syntax error undefined index form validation htmlspecialchars CSRF protection

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