I was trying to find a way to see if my site's code was valid or not but I continuously going over to W3 Validator so I decided to make an "API" however it really isn't!

I just wanted to know if anybody can find a better solution to the one I have made. This is what I currently use, with the usage of ?uri=http://www.mydomain.com :

<?php
if(!$_GET['uri']) {
echo "No URI!";
}
else {
 $CheckURI = "http://validator.w3.org/check?uri=".$_GET['uri'];
 $URL = file_get_contents($CheckURI);
 $Start = strpos($URL, "<title>") + 7;
 $End = strpos($URL, "</title>");
 $Title = substr($URL, $Start, $End-$Start);
 if(preg_match('[Invalid]',$Title)) {
     //Code is INVALID
     echo "<a href='$CheckURI' title='This is not good!' target='_BLANK'>INVALID Source</a>";
 }
 elseif(preg_match('[Valid]',$Title)) {
     //Code is VALID
     echo "<a href='$CheckURI' title='Check It Yourself!' target='_BLANK'>Valid Source</a>";
 }
 else {
    //It Went WRONG
    echo "";
 }
}