php实现简单的语法高亮函数

一个php实现的简单语法高亮显示的函数，注意：这个函数设计的比较简单，可能对某些语法不能高亮显示，你可以自己扩充该函数的功能

1. function syntax_highlight($code){
3. // this matches --> "foobar" <--
4. $code = preg_replace(
5. '/"(.*?)"/U',
6. '"$1"', $code
7. );
9. // hightlight functions and other structures like --> function foobar() <---
10. $code = preg_replace(
11. '/(\s)\b(.*?)((\b|\s)\()/U',
12. '$1$2$3',
13. $code
14. );
16. // Match comments (like /* */):
17. $code = preg_replace(
18. '/(\/\/)(.+)\s/',
19. '$0',
20. $code
21. );
23. $code = preg_replace(
24. '/(\/\*.*?\*\/)/s',
25. '$0',
26. $code
27. );
29. // hightlight braces:
30. $code = preg_replace('/(\(|\[|\{|\}|\]|\)|\->)/', '$1', $code);
32. // hightlight variables $foobar
33. $code = preg_replace(
34. '/(\$[a-zA-Z0-9_]+)/', '$1', $code
35. );
37. /* The \b in the pattern indicates a word boundary, so only the distinct
38. ** word "web" is matched, and not a word partial like "webbing" or "cobweb"
39. */
41. // special words and functions
42. $code = preg_replace(
43. '/\b(print|echo|new|function)\b/',
44. '$1', $code
45. );
47. return $code;
48. }
51. /*example-start*/
53. /*
54. ** Create some example PHP code:
55. */
57. $example_php_code = '
58. // some code comment:
59. $example = "foobar";
61. print $_SERVER["REMOTE_ADDR"];
63. $array = array(1, 2, 3, 4, 5);
65. function example_function($str) {
66. // reverse string
67. echo strrev($obj);
68. }
70. print example_function("foo");
72. /*
73. ** A multiple line comment
74. */
76. print "Something: " . $example;';
79. // output the formatted code:
80. print '

    ';
    print syntax_highlight($example_php_code);
    print '

    ';
82. /*example-end*/