php关键词自动添加span标签与关键词高亮代码

2. // Example use: $spanned = codeWords($string_containing_keywords);
3. // My site: andrew.dx.am
4. // Using colour==blue, but different arrays of words and different
5. // colours can be added.
6. function onlyWholeWords(&$value, $key) {
7. // Ignores words after // comment delimiters.
8. //$value = "/\b(" . $value . ")\b/"; // doesn't handle comments
9. //$value = "/^(?:(?!\/\/).)*\K\b(" . $value . ")\b/";
10. // \K lookbehind alternative is not supported in PHP $value = "/^((?:(?!\/\/).)*)\b" . $value . "\b/";
11. }
12. function addSpan(&$value, $key, $color='blue') {
13. $value = "$1" . $value . "";
14. }
15. function codeWords($code) {
16. $keywords = array('as', 'break', 'case', 'class',
17. 'continue', 'default', 'do', 'elif', 'else',
18. 'elseif', 'for', 'foreach', 'function', 'if',
19. 'new', 'null', 'return', 'self', 'switch',
20. 'this', 'to', 'typeof', 'until',
21. 'var', 'void', 'while', 'with');
22. $keywords2 = $keywords;
23. array_walk($keywords, 'onlyWholeWords');
24. array_walk($keywords2, 'addSpan', 'blue');
25. $code = preg_replace($keywords, $keywords2, $code);
26. return $code;
27. }

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二、php自动给文章加关键词链接

自动给文章加关键词链接的php函数代码。

代码：

3. $link = array(

4. '百度,http://www.baidu.com/',
5. 'php教程,http://bbs.it-home.org/wb/php/',
6. '脚本学堂,http://bbs.it-home.org/',
7. );
8. $str = '在百度中搜索php教程就可以到程序员之家提供的php编程文章
   
9. 此处放置需要替换的内容。';
10. $out=keylink($str,$link,1); //$str 原始字符 $link，替换链接数组, 3替换次数
11. echo $out;
12. function _sortDesc($a, $b) {
13. return (strlen($a[0]) }
14. function keylink($str,$link,$count=1)
15. {
16. $linkDefs = $link;
17. $linkMap = array();
18. foreach($linkDefs as $row) {
19. $linkMap[] = explode(',', $row);
20. }

21. foreach($linkMap as $row) {

22. $str = preg_replace('/(\s*)('.$row[0].')(\s*)/sui', '${2}', $str);
23. }

24. usort($linkMap, '_sortDesc');

25. $tmpKwds = array();

26. foreach($linkMap as $i=>$row) {

27. list($kwd, $url) = $row;
28. for($j=$i+1; $j$subKwd = $linkMap[$j][0];
29. //如果包含其他关键字，暂时替换成其他字符串
30. if(strpos($kwd, $subKwd) !== false) {
31. $tmpKwd = '{'.md5($subKwd).'}';
32. $kwd = str_replace($subKwd, $tmpKwd, $kwd);
33. $tmpKwds[$tmpKwd] = $subKwd;
34. }
35. }
36. //把文字替换成链接
37. $str = preg_replace('/('.$row[0].')/sui', ''.$kwd.'', $str, $count);
38. }

39. //把代替子关键字的字符串替换回来

40. foreach($tmpKwds as $tmp=>$kwd) {
41. $str = str_replace($tmp, $kwd, $str);
42. }
43. return $str;
44. }
45. ?>

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