มีใครพอจะทราบเกี่ยวกับแทรกเงื่อนไข send e-mail alert

<?php
    $url = "www.google.co.th";

if($url) {
    
    $fp = @fsockopen("$url", 80, $errno, $errstr, 30);
    if (!$fp) {
       	$data = "$url --> <b>Offline</b>";
	$strTo = "[email protected]";
	$strSubject = "Test Send Email";
	$strHeader = "From: webmaster@gmail";
	$strMessage = "Server Offline";
	$flgSend = @mail($strTo,$strSubject,$strMessage,$strHeader);  // @ = No Show Error //
	if($flgSend)
	{
		echo "Email Sending.";
	}
	else
	{
		echo "Email Can Not Send.";
	}

    } 
    else {
        	$data = "$url --> <b>Online</b>";
        fclose($fp);
    }
    echo $data;
}
?>