PHP determines the browser type of the client

PHP judges the browser type of the client, determines the browser name and version, and determines the browser type of the client.
01 /**
02 * Determine the browser name and version
03 */
04 function get_user_browser ()
05 {
06 if (empty ($ _ SERVER ['http _ USER_AGENT '])
07 {
08 return '';
09}
10
11 $ agent = $ _ SERVER ['http _ USER_AGENT '];
12 $ browser = '';
13 $ browser_ver = '';
14
15 if (preg_match ('/MSIE \ s ([^ \ s |;] +)/I', $ agent, $ regs ))
16 {
17 $ browser = 'Internet Explorer ';
18 $ browser_ver = $ regs [1];
19}
20 elseif (preg_match ('/FireFox \/([^ \ s] +)/I', $ agent, $ regs ))
21 {
22 $ browser = 'Firefox ';
23 $ browser_ver = $ regs [1];
24}
25 elseif (preg_match ('/Maxthon/I', $ agent, $ regs ))
26 {
27 $ browser = '(Internet Explorer'. $ browser_ver. ') Maxthon ';
28 $ browser_ver = '';
29}
30 elseif (preg_match ('/Opera [\ s | \/] ([^ \ s] +)/I', $ agent, $ regs ))
31 {
32 $ browser = 'Opera ';
33 $ browser_ver = $ regs [1];
34}
35 elseif (preg_match ('/OmniWeb \/(v *) ([^ \ s |;] +)/I', $ agent, $ regs ))
36 {
37 $ browser = 'omniweb ';
38 $ browser_ver = $ regs [2];
39}
40 elseif (preg_match ('/Netscape ([\ d] *) \/([^ \ s] +)/I', $ agent, $ regs ))
41 {
42 $ browser = 'Netscape ';
43 $ browser_ver = $ regs [2];
44}
45 elseif (preg_match ('/safari \/([^ \ s] +)/I', $ agent, $ regs ))
46 {
47 $ browser = 'Safari ';
48 $ browser_ver = $ regs [1];
49}
50 elseif (preg_match ('/NetCaptor \ s ([^ \ s |;] +)/I', $ agent, $ regs ))
51 {
52 $ browser = '(Internet Explorer'. $ browser_ver. ') NetCaptor ';
53 $ browser_ver = $ regs [1];
54}
55 elseif (preg_match ('/Lynx \/([^ \ s] +)/I', $ agent, $ regs ))
56 {
57 $ browser = 'Lynx ';
58 $ browser_ver = $ regs [1];
59}
60
61 if (! Empty ($ browser ))
62 {
63 return addslashes ($ browser. ''. $ browser_ver );
64}
65 else
66 {
67 return 'unknow browser ';
68}
69}