getheadheaders

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<?php
define('HTTP_MAX_REDIRECT_COUNT', 5);

define('HTTP_MAX_HEADER_LENGTH', 2560);

define('HTTP_DEFAULT_PORT', 80);

define('HTTP_TIMEOUT', 5);

function get_head_headers($url, $follow_redirect = false) {
    
    static $redirect_count;
    
    if(!is_array($url)) {
        $url = parse_url($url);
    }
        
    if(!array_key_exists('port', $url)) {
        $url['port'] = HTTP_DEFAULT_PORT;
    }
    
    if(empty($url['path'])) {
        $url['path'] = '/';
    }
    
    $socket = @fsockopen($url['host'], $url['port'], $error_no, $error_str, HTTP_TIMEOUT);
    
    if(!$socket) {
        throw new LogicException("Could not create connection. Reason: $error_str");
    }
    
    $request = sprintf("HEAD %s HTTP/1.1\r\nHost: %s\r\nConnection: Close\r\n\r\n",
        $url['path'] . (isset($url['query']) ? '?' . $url['query'] : ''),
        $url['host']);
    
    if(!fwrite($socket, $request)) {
        throw new LogicException("Could not write to socket. Reason: $error_str");
    }
    
    $headers = array();
    
    while(!feof($socket)) {    
        list($name, $value) = array_merge(explode(':', fgets($socket, HTTP_MAX_HEADER_LENGTH), 2), array(''));
        
        if(!trim($name)) continue;
        
        if($value) {
            $headers[trim($name)] = trim($value);
        } else {
            $headers[] = trim($name); // voor de 1e 200 OK regel
        }
    }
    
    fclose($socket);
    
    if($follow_redirect && array_key_exists('Location', $headers)) {
        
        if($redirect_count++ >= HTTP_MAX_REDIRECT_COUNT) {
            throw new LogicException('Max redirect count reached');
        }
        
        $new_url = parse_url($headers['Location']);
        
        if(!isset($new_url['host'])) {
            $new_url['host'] = $url['host'];
        }
        
        if($new_url['path'][0] != '/') {
            $new_url['path'] = dirname($url['path']) . '/' . $new_url['path'];
        }
        
        return get_head_headers($new_url, true);
    }
    
    $redirect_count = 0;
        
    return $headers;
}
?>

 
 

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