Prevent PHP code from executing if form was not submitted

Question

I have a php file say "check.php" in my website and it is executed when a form is submitted.

say my website is "myweb.com" and the php file is in a directory "PHP"

I want to prevent direct url access to the "check.php" file i.e. if anyone types the url "myweb.com/PHP/check.php" ,then the php file should not be executed and it should return a error message instead.

I tried to prevent the access by setting a rule in .htaccess ,but it blocks the php even when I try to submit the form.

.htaccess rule :

RewriteEngine on 
RewriteCond %{THE_REQUEST} \.php[\ /?].*HTTP/ 
(.*)\.php$ /index.html [L] 

Is there any possible way to do it ?

Answer 1

You can do it with PHP

<?php
    /* at the top of 'check.php' */
    if ( $_SERVER['REQUEST_METHOD']=='GET' && realpath(__FILE__) == realpath( $_SERVER['SCRIPT_FILENAME'] ) ) {
        /* 
           Up to you which header to send, some prefer 404 even if 
           the files does exist for security
        */
        header( 'HTTP/1.0 403 Forbidden', TRUE, 403 );
        die;
    }