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[PHP] Is URL online?

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Return true if URL is online.

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  1. function is_online( $url ){
  2. 	$url = @parse_url($url);
  3. 	if (!$url) return false;
  4.  
  5. 	$url = array_map('trim', $url);
  6. 	$url['port'] = (!isset($url['port'])) ? 80 : (int)$url['port'];
  7.  
  8. 	$path = (isset($url['path'])) ? $url['path'] : '/';
  9. 	$path .= (isset($url['query'])) ? "?$url[query]" : '';
  10.  
  11. 	if (isset($url['host']) && $url['host'] != gethostbyname($url['host'])) {
  12.  
  13. 		$fp = fsockopen($url['host'], $url['port'], $errno, $errstr, 30);
  14.  
  15. 		if (!$fp) return false; //socket not opened
  16.  
  17. 		fputs($fp, "HEAD $path HTTP/1.1
  18. Host: $url[host]
  19.  
  20. "); //socket opened
  21. 		$headers = fread($fp, 4096);
  22. 		fclose($fp);
  23.  
  24. 		if(preg_match('#^HTTP/.*\s+[(200|301|302)]+\s#i', $headers)){
  25. 			//matching header
  26. 			return true;
  27. 		}
  28. 		else return false;
  29.  
  30. 	} // if parse url
  31. 	else return false;
  32. }

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