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PHP implements a simple source code syntax highlighting function

WBOY
WBOYOriginal
2016-07-25 08:45:321022browse

A simple syntax highlighting function implemented in PHP. Note: This function is relatively simple in design and may not be able to highlight certain syntaxes. You can expand the function of this function yourself

  1. function syntax_highlight($code ){
  3. // this matches --> "foobar" <--
  4. $code = preg_replace(
  5. '/"(.*?)"/U',
  6. '"$1"', $code
  7. );
  9. // highlight 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. // highlight braces:
  30. $code = preg_replace('/((|[|{|}|]|)|->)/', '$1
  31. // highlight variables $foobar
  32. $code = preg_replace(
  33. '/($[a-zA-Z0-9_]+)/', '$1', $code
  34. );
  36. /* The b in the pattern indicates a word boundary, so only the distinct
  37. ** word "web" is matched, and not a word partial like "webbing" or "cobweb"
  38. */
  40. // special words and functions
  41. $code = preg_replace(
  42. '/b(print|echo|new|function)b/',
  43. '$1', $code
  44. );
  46. return $code;
  47. }
  50. /*example-start*/
  52. /*
  53. ** Create some example PHP code :
  54. */
  56. $example_php_code = '
  57. // some code comment:
  58. $example = "foobar";
  60. print $_SERVER["REMOTE_ADDR"];
  62. $array = array(1, 2, 3, 4 , 5);
  64. function example_function($str) {
  65. // reverse string
  66. echo strrev($obj);
  67. }
  69. print example_function("foo");
  71. /*
  72. ** A multiple line comment
  73. */
  75. print "Something: " . $example;';
  78. // output the formatted code:
  79. print '
    ';</li>
<li>print syntax_highlight($example_php_code);</li>
<li>print '
    ';
  81. /*example-end*/
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