php 模拟get_headers函数的代码示例

<?php  

02 if(!function_exists('get_headers')){  

03     function get_headers($url,$format=0){  

04         $url=parse_url($url);  

05         $end="\r\n\r\n";  

06         $fp=fsockopen($url['host'],(empty($url['port'])?80:$url['port']),$errno,$errstr,30);  

07         if($fp){  

08             $out="GET / HTTP/1.1\r\n";  

09             $out.="Host: ".$url['host']."\r\n";  

10             $out.="Connection: Close\r\n\r\n";  

11             $var='';  

12             fwrite($fp,$out);  

13             while(!feof($fp)){  

14                 $var.=fgets($fp,1280);  

15                 if(strpos($var,$end))  

16                 break;  

17             }  

18             fclose($fp);  

19             $var=preg_replace("/\r\n\r\n.*\$/",'',$var);  

20             $var=explode("\r\n",$var);  

21             if($format){  

22                 foreach($var as $i){  

23                     if(preg_match('/^([a-zA-Z -]+): +(.*)$/',$i,$parts))  

24                     $v[$parts[1]]=$parts[2];  

25                 }  

26                 return $v;  

27             }else{  

28                 return $var;  

29             }  

30         }  

31     }  

32 }  

33 echo '<pre>';  

34 print_r(get_headers('http://www.jb51.net'));