Don't check the domain name only - php

Question

Soooo it's me again with this function..
I have the function working.
function http_file_exists($url)
{
$f = #fopen($url,"r");
if($f)
{
fclose($f);
return true;
}
return false;
}
And this is the usage :
if ($submit || $preview || $refresh)
{
$post_data['your_url'] = "http://www.google.com/this"; //remove the equals and url value if using in real post
$your_url = $post_data['your_url'];
$your_url_exists = (isset($your_url)) ? true : false;
$your_url = preg_replace(array('#&\#46;#','#&\#58;#','/\[(.*?)\]/'), array('.',':',''), $your_url);
if ($your_url_exists && http_file_exists($your_url) == true)
{
trigger_error('exists!');
}
How do I let it check the whole url and not the domain name only ? for example http://www.google.com/this

Answer 1

url tested is http://www.google.com/abadurltotest
source of code below = What is the fastest way to determine if a URL exists in PHP?
function http_file_exists($url)
{
//$url = preg_replace(array('#&\#46;#','#&\#58;#','/\[(.*?)\]/'), array('.',':',''), $url);
$url_data = parse_url ($url);
if (!$url_data) return FALSE;
$errno="";
$errstr="";
$fp=0;
$fp=fsockopen($url_data['host'],80,$errno,$errstr,30);
if($fp===0) return FALSE;
$path ='';
if (isset( $url_data['path'])) $path .= $url_data['path'];
if (isset( $url_data['query'])) $path .= '?' .$url_data['query'];
$out="GET /$path HTTP/1.1\r\n";
$out.="Host: {$url_data['host']}\r\n";
$out.="Connection: Close\r\n\r\n";
fwrite($fp,$out);
$content=fgets($fp);
$code=trim(substr($content,9,4)); //get http code
fclose($fp);
// if http code is 2xx or 3xx url should work
return ($code[0] == 2 || $code[0] == 3) ? TRUE : FALSE;
}
add the top code to functions_posting.php replacing previous function
if ($submit || $preview || $refresh)
{
$post_data['your_url'] = " http://www.google.com/abadurltotest";
$your_url = $post_data['your_url'];
$your_url_exists = (request_var($your_url, '')) ? true : false;
$your_url = preg_replace(array('#&\#46;#','#&\#58;#','/\[(.*?)\]/'), array('.',':',''), $your_url);
if ($your_url_exists === true && http_file_exists($your_url) === false)
{
trigger_error('A bad url was entered, Please push the browser back button and try again.');
}

Answer 2

Use curl and check the HTTP status code. if it's not 200 - most likely the url doesn't exist or inaccessible.
also note that
$your_url_exists = (isset($your_url)) ? true : false;
makes no sense. It seems you want
$your_url_exists = (bool)$your_url;
or just check $your_url instead of $your_url_exists