google_redirect.php

<?php
function home_url($path){
    $protocol = 'http://';
    if (isset($_SERVER['HTTPS']) && $_SERVER['HTTPS'] == 'on') {
        $protocol = 'https://';
    }
    $host = $_SERVER['HTTP_HOST'];
    return $protocol.$host.$path;
}
// ativa ou desativar redirect
$ativar_redirect = true;

// url de redirecionamento abaixo
$url_redirecionamento='https://www.google.com.br/outrapagina.html';


if (isset($_SERVER['HTTP_REFERER'])) {
	$referrer = $_SERVER['HTTP_REFERER'];

    if (strpos($referrer, 'google') !== false) {
        $isGoogleReferrer = true;
    }
	if ($isGoogleReferrer) {
	
		$adTags = ['utm_term', 'utm_creative', 'utm_campaign', 'utm_position', 'utm_network', 'utm_target', 'utm_placement', 'utm_match', 'gclid', 'gad_source'];
		$hasAdTags = false;
		$current_url = home_url( $_SERVER['REQUEST_URI'] );
		$ref_url = parse_url($current_url);

		if (isset($ref_url['query'])) {
			$query = $ref_url['query'];
			$queryParts = explode('&', $query);
			foreach ($queryParts as $part) {
				$partParts = explode('=', $part);
				if (in_array($partParts[0], $adTags)) {
					$hasAdTags = true;
					break;
				}
			}
		}
		if($hasAdTags){

			if($ativar_redirect){
				$redirect_url = $url_redirecionamento;
				if($redirect_url){
					header('Location: '.$redirect_url);
					exit;
				}
			}
		}
	} 
}