本文实例讲述了PHP实现的浏览器检查类。分享给大家供大家参考，具体如下：

1. <?php
2. //原作者：epsilon7
3. //SonyMusic([email]sonymusic@163.net[/email])
4. class BrowserDetector {
5. var $UA = ""; //$HTTP_USER_AGENT的内容
6. var $BROWSER= "Unknown"; //浏览器类型
7. var $PLATFORM = "Unknown"; //操作系统
8. var $VERSION= ""; //浏览器版本号
9. var $MAJORVER = ""; //浏览器主版本号
10. var $MINORVER = ""; //浏览器副版本号
11. /* 构造函数开始 */
12. function BrowserDetector(){
13. $this->UA = getenv(HTTP_USER_AGENT);
14. $preparens = "";
15. $parens = "";
16. $i = strpos($this->UA,"(");
17. if ($i >= 0) {
18. $preparens = trim(substr($this->UA,0,$i));
19. $parens = substr($this->UA,$i+1,strlen($this->UA));
20. $j = strpos($parens,")");
21. if($j>=0) {
22. $parens = substr($parens,0,$j);
23. }
24. }
25. else {
26. $preparens = $this->UA;
27. }
28. $browVer = $preparens;
29. $token = trim(strtok($parens,";"));
30. while($token) {
31. if($token=="compatible") {
32. }
33. elseif(preg_match("/MSIE/i","$token")) {
34. $browVer = $token;
35. }
36. elseif(preg_match("/Opera/i","$token")) {
37. $browVer = $token;
38. }
39. elseif(preg_match("/X11/i","$token") || preg_match("/SunOS/i","$token") || preg_match ("/Linux/i","$token")) {
40. $this->PLATFORM = "Unix";
41. }
42. elseif(preg_match("/Win/i","$token")) {
43. $this->PLATFORM = $token;
44. }
45. elseif(preg_match("/Mac/i","$token") || preg_match("/PPC/i","$token")) {
46. $this->PLATFORM = $token;
47. }
48. $token = strtok(";");
49. }
50. $msieIndex = strpos($browVer,"MSIE");
51. if($msieIndex >= 0) {
52. $browVer = substr($browVer,$msieIndex,strlen($browVer));
53. }
54. $leftover = "";
55. if(substr($browVer,0,strlen("Mozilla")) == "Mozilla") {
56. $this->BROWSER = "Netscape";
57. $leftover=substr($browVer,strlen("Mozilla")+1,strlen($browVer));
58. }
59. elseif(substr($browVer,0,strlen("Lynx")) == "Lynx") {
60. $this->BROWSER = "Lynx";
61. $leftover=substr($browVer,strlen("Lynx")+1,strlen($browVer));
62. }
63. elseif(substr($browVer,0,strlen("MSIE")) == "MSIE") {
64. $this->BROWSER = "IE";
65. $leftover=substr($browVer,strlen("MSIE")+1,strlen($browVer));
66. }
67. elseif(substr($browVer,0,strlen("Microsoft Internet Explorer")) == "Microsoft Internet Explorer") {
68. $this->BROWSER = "IE";
69. $leftover=substr($browVer,strlen("Microsoft Internet Explorer")+1,strlen($browVer));
70. }
71. elseif(substr($browVer,0,strlen("Opera")) == "Opera") {
72. $this->BROWSER = "Opera";
73. $leftover=substr($browVer,strlen("Opera")+1,strlen($browVer));
74. }
75. $leftover = trim($leftover);
76. $i=strpos($leftover," ");
77. if($i > 0) {
78. $this->VERSION = substr($leftover,0,$i);
79. }
80. else {
81. $this->VERSION = $leftover;
82. }
83. $j = strpos($this->VERSION,".");
84. if($j >= 0) {
85. $this->MAJORVER = substr($this->VERSION,0,$j);
86. $this->MINORVER = substr($this->VERSION,$j+1,strlen($this->VERSION));
87. }
88. else {
89. $this->MAJORVER = $this->VERSION;
90. }
91. }
92. }
93. //测试程序开始
94. $test=new browserdetector;
95. echo $test->UA."<br>";
96. echo $test->BROWSER."<br>";
97. echo $test->PLATFORM."<br>";
98. echo $test->VERSION."<br>";
99. echo $test->MAJORVER."<br>";
100. echo $test->MINORVER."<br>";
101. ?>