Prevent PHP Input History Storage

In PHP, it is not possible to directly delete a user’s input history. This data is usually stored by the browser or operating system, and PHP does not have direct access to modify or delete it.

If you do not want the historical information entered by users to be saved, you can achieve this by following these steps:

1. disable autocomplete

<form action="submit.php" method="post">
    <input type="text" name="username" autocomplete="off">
    <input type="submit" value="Submit">
</form>

1. Use JavaScript to clear the values of the form fields to ensure that users do not see the previously entered content when they visit next.

<script>
    document.addEventListener('DOMContentLoaded', function() {
        var input = document.querySelector('input[name="username"]');
        if (input) {
            input.value = '';
        }
    });
</script>

Please note that the above method can only ensure that the historical information entered by the user is not saved, but cannot delete the input history information that has already been saved. To delete saved input history information, the user needs to make the necessary adjustments in the settings of their browser or operating system.