Is it possible to prevent users from submitting custom input values in PHP forms?

To prevent users from submitting custom input values in PHP forms, you can use server-side validation to check the submitted values against a predefined list of acceptable options. This can help ensure that only valid input values are accepted. 

<?php
$valid_input_values = array("option1", "option2", "option3");

if(isset($_POST['submit'])){
    $user_input = $_POST['input_field'];

    if(in_array($user_input, $valid_input_values)){
        // Process the form submission
    } else {
        // Display an error message or handle the invalid input
    }
}
?>

Keywords

PHP form validation input filtering security user input

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