Can a form be submitted multiple times from the server side using PHP directly?

To prevent a form from being submitted multiple times from the server side using PHP directly, you can utilize a session variable to track whether the form has already been submitted. You can set a session variable upon form submission and check this variable before processing the form data to ensure that the form is only submitted once. 

<?php
session_start();

if(isset($_POST['submit'])) {
    if(!isset($_SESSION['form_submitted'])) {
        // Process form data here

        // Set session variable to indicate form submission
        $_SESSION['form_submitted'] = true;
    } else {
        echo "Form has already been submitted.";
    }
}
?>

Keywords

PHP form submission server side multiple times direct submission

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