php实现简单的源码语法高亮函数

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" $code = preg_replace(
4. '/"(.*?)"/U',
5. '"$1"', $code
6. );
8. // hightlight functions and other structures like --> function foobar() $code = preg_replace(
9. '/(\s)\b(.*?)((\b|\s)\()/U',
10. '$1$2$3',
11. $code
12. );
14. // Match comments (like /* */):
15. $code = preg_replace(
16. '/(\/\/)(.+)\s/',
17. '$0',
18. $code
19. );
21. $code = preg_replace(
22. '/(\/\*.*?\*\/)/s',
23. '$0',
24. $code
25. );
27. // hightlight braces:
28. $code = preg_replace('/(\(|\[|\{|\}|\]|\)|\->)/', '$1', $code);
30. // hightlight variables $foobar
31. $code = preg_replace(
32. '/(\$[a-zA-Z0-9_]+)/', '$1', $code
33. );
35. /* The \b in the pattern indicates a word boundary, so only the distinct
36. ** word "web" is matched, and not a word partial like "webbing" or "cobweb"
37. */
39. // special words and functions
40. $code = preg_replace(
41. '/\b(print|echo|new|function)\b/',
42. '$1', $code
43. );
45. return $code;
46. }
49. /*example-start*/
51. /*
52. ** Create some example PHP code:
53. */
55. $example_php_code = '
56. // some code comment:
57. $example = "foobar";
59. print $_SERVER["REMOTE_ADDR"];
61. $array = array(1, 2, 3, 4, 5);
63. function example_function($str) {
64. // reverse string
65. echo strrev($obj);
66. }
68. print example_function("foo");
70. /*
71. ** A multiple line comment
72. */
74. print "Something: " . $example;';
77. // output the formatted code:
78. print '

    ';

79. print syntax_highlight($example_php_code);
80. print '';
82. /*example-end*/

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