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13 years ago
I wrote the following to see if a submitted URL has a valid http response code and also if it responds quickly. 
 
Use the code like this: 
 
<?php 
$is_ok = http_response($url); // returns true only if http response code < 400 
?> 
 
The second argument is optional, and it allows you to check for a specific response code 
 
<?php 
http_response($url,'400'); // returns true if http status is 400 
?> 
 
The third allows you to specify how long you are willing to wait for a response. 
 
<?php 
http_response($url,'200',3); // returns true if the response takes less than 3 seconds and the response code is 200 
?> 
 
<?php 
function http_response($url, $status = null, $wait = 3) 
{ 
 $time = microtime(true); 
 $expire = $time + $wait; 
 
 // we fork the process so we don't have to wait for a timeout 
 $pid = pcntl_fork(); 
 if ($pid == -1) { 
 die('could not fork'); 
 } else if ($pid) { 
 // we are the parent 
 $ch = curl_init(); 
 curl_setopt($ch, CURLOPT_URL, $url); 
 curl_setopt($ch, CURLOPT_HEADER, TRUE); 
 curl_setopt($ch, CURLOPT_NOBODY, TRUE); // remove body 
 curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE); 
 $head = curl_exec($ch); 
 $httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE); 
 curl_close($ch); 
 
 if(!$head) 
 { 
 return FALSE; 
 } 
 
 if($status === null) 
 { 
 if($httpCode < 400) 
 { 
 return TRUE; 
 } 
 else 
 { 
 return FALSE; 
 } 
 } 
 elseif($status == $httpCode) 
 { 
 return TRUE; 
 } 
 
 return FALSE; 
 pcntl_wait($status); //Protect against Zombie children 
 } else { 
 // we are the child 
 while(microtime(true) < $expire) 
 { 
 sleep(0.5); 
 } 
 return FALSE; 
 } 
 } 
?> 
 
Hope this example helps. It is not 100% tested, so any feedback [sent directly to me by email] is appreciated.
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