Simulate login with PHP

Some people often ask questions about simulated login. In fact, the principle is very simple. you just need to save the SessionID. Today, it took an hour to write a function for your reference.

Some people often ask questions about simulated login. In fact, the principle is very simple. you just need to save the SessionID. Today, it took an hour to write a function for your reference, the header information returned by the website. The source code is as follows:

2. /*
3. * Get the webpage content
4. * Parameter: $ host [in] string
5. * Host name (for example, www.shanghaicom)
6. * Parameter: $ method [in] string
7. * Submission method: POST, GET, HEAD... and add relevant parameters (for detailed syntax, see RFC1945, RFC2068)
8. * Parameter: $ str [in] string
9. * Submitted content
10. * Parameter: $ sessid [in] string
11. * PHP SESSIONID
12. *
13. * @ Return webpage content string
14. */
15. Function GetWebContent ($ host, $ method, $ str, $ sessid = '')
16. {
17. $ Ip = gethostbyname ($ host );
18. $ Fp = fsockopen ($ ip, 80 );
19. If (! $ Fp) return;
20. Fputs ($ fp, "$ methodrn ");
21. Fputs ($ fp, "Host: $ hostrn ");
22. If (! Emptyempty ($ sessid ))
23. {
24. Fputs ($ fp, "Cookie: PHPSESSID = $ sessid; path =/; rn ");
25. }
26. If (substr (trim ($ method), 0, 4) = "POST ")
27. {
28. Fputs ($ fp, "Content-Length:". strlen ($ str). "rn"); // do not forget to specify the Length.
29. }
30. Fputs ($ fp, "Content-Type: application/x-www-form-urlencodedrnrn ");
31. If (substr (trim ($ method), 0, 4) = "POST ")
32. {
33. Fputs ($ fp, $ str. "rn ");
34. }
35. While (! Feof ($ fp ))
36. {
37. $ Response. = fgets ($ fp, 1024 );
38. }
39. $ Hlen = strpos ($ response, ""); // "" in LINUX ""
40. $ Header = substr ($ response, 0, $ hlen );
41. $ Entity = substr ($ response, $ hlen 4 );
42. If (preg_match ('/PHPSESSID = ([0-9a-z]);/I', $ header, $ matches ))
43. {
44. $ A ['sessid '] = $ matches [1];
45. }
46. If (preg_match ('/Location: ([0-9a-z _? = & #.])/I ', $ header, $ matches ))
47. {
48. $ A ['location'] = $ matches [1];
49. }
50. $ A ['content'] = $ entity;
51. Fclose ($ fp );
52. Return $;
53. }
54.  
55. /* Construct the username and password string */
56. $ Str = ("username = test & password = test ");
57. $ Response = GetWebContent ("localhost", "POST/login. php HTTP/1.0", $ str );
58. Echo $ response ['location']. $ response ['content']."
    ";
59. Echo $ response ['sessid ']."
    ";
60. If (preg_match ('/error. php/I', $ response ['location'])
61. {
62. Echo "login failed
    ";
63. } Else {
64. Echo "login successful
    ";
65. // User. php cannot be accessed because the sessid parameter is not included.
66. $ Response = GetWebContent ("localhost", "GET/user. php HTTP/1.0 ",'','');
67. Echo $ response ['location']."
    "; // Result: error. php? Errcode = 2
68.  
69. // You can access user. php
70. $ Response = GetWebContent ("localhost", "GET/user. php HTTP/1.0", '', $ response ['sessid']);
71. Echo $ response ['location']."
    "; // Result: user. php
72. }
73. ?>