I don't want to display ads to Facebook, Twitter Visitors

Question

I am now using this code for facebook. "https" is active and wordpress site.

<?php

    $ref = $_SERVER['HTTP_REFERER'];
    if (strpos($ref, 'facebook.com') != false) {

?>

DON'T SHOW ADS

<?php } else { ?>

SHOW ADS

<?php }   ?>

This code works for facebook. I wanted to add twitter, but when I add twitter it doesn't work at all. I tried this.

if (strpos($ref, 'facebook.com', 'twitter.com', 't.co') != false) {

It didn't work that way. If else query or "false" is correct? How can I do it in the simplest way? If the visitor comes from Facebook, Twitter, I don't want to show ads. thanks

Answer 1

strpos() does not check multiple "needles" to look for. You can store them in an array and iterate over each one individually though:

<?php
    
    $ref = $_SERVER['HTTP_REFERER'];

    $sitesWithAdsHidden = [
        'facebook.com',
        'twitter.com',
        't.co',
    ];
    
    $isHiddenSite = false;
    foreach ($sitesWithAdsHidden as $site) {
        if (strpos($ref, $site) !== false) {
            $isHiddenSite = true;
            break;
        }
    }

    if ($isHiddenSite) {

?>

DON'T SHOW ADS

<?php } else { ?>

SHOW ADS

<?php }   ?>

Note that I also changed the strpos comparison to !== because a non-strict check could lead to evaluating to false if the position is actually 0 (the start of the string).