Check if PHP is being called via command line or web browser.

clicheck.php

<?php

function CliCheck()
{
    if (defined('STDIN')) return true;
    if (php_sap_name() === 'cli') return true;
    if (array_key_exists('SHELL', $_ENV)) return true;
    if (
        empty($_SERVER['REMOTE_ADDR']) &&
        ! isset($_SERVER['HTTP_USER_AGENT']) &&
        count($_SERVER['argv']) > 0
    ) return true;
    if (! array_key_exists('REQUEST_METHOD', $_SERVER)) return true;
    return false;
}