Sample code for simulating the get_headers function in php

This article introduces the sample code for simulating the get_headers function in php. For more information, see The code is as follows:

02 if (! Function_exists ('Get _ headers ')){

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

04 $ url = parse_url ($ url );

05 $ end = "\ 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 ";

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. * \ $/", '', $ 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'

';  
34 print_r(get_headers('http://www.bitsCN.com'));