Greet google referer

This function will check if your visitor comes from google and greets the visitor.

function greet_google_referer($url)
{
	$message = '';
	if (preg_match('#^http:\/\/www\.google\.([a-z]){2,4}\/.+$#', $url))
	{
		$message = 'Welcome Google user!';
	}

	return $message;
}

Example of use

echo greet_google_referer(@$_SERVER['HTTP_REFERER']);

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