Community Learn Tools Library Leisure
search
English
Home > Backend Development > PHP Tutorial > PHP recursive algorithm PHP recursive function infinite classification

PHP recursive algorithm PHP recursive function infinite classification

WBOY
Release： 2016-07-25 08:54:02
Original
1017 people have browsed it

  3. <

  4. /**
  5. * Function: Query all categories to generate Tree menu
  6. * @param int $pid parent ID, query starts from the top level by default
  7. */
  8. function toTree($pid=0){
  9. //Query all top categories
  10. //Not much to say about the database connection here
  11. $model=M('Category'); Instantiate the model
  12. //Query map conditions
  13. $map=array(
  14. 'pid'=>$pid,
  15. );
  16. //Query
  17. $data=$model- >where($map)->select();
  18. //Define a new array to store the generated html tree menu
  19. $html_array=array();
  20. //Loop classification
  21. $html='';
  22. $padding=0; //Indentation
  23. foreach($data as $k=>$v){
  24. //Indentation is implemented based on the value of the path field
  25. $path=$v['path'];
  26. if( $path&&strpos($v['path'],'-')){
  27. $path_array=@explode('-',$v['path']);
  28. $count=count($path_array)-1;
  29. $padding=$count*20; //The next level classification is indented by 20 pixels
  30. }
  31. //Current classification data html
  32. $data_array[]='
  33. '.$v['name'].'
  34. ';< ;/p>

  35. //Recursively start to search for lower-level categories

  36. $data_array[]=toTree($v['id']);//Recurse using the ID of the current category as the parent ID
  37. }
  38. / /Foreach loop ends and merges classified html arrays
  39. $html.=implode('',$data_array());
  40. $html.='';
  41. //HTML tree menu construction is completed, it’s that simple, so easy!
  42. return $html;
  43. }

Copy code


Related labels：
php递归算法 php递归函数无限级分类
source：php.cn
Previous article：PHP probe used when phpinfo() function is disabled Next article：Summary of php output string method
Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
Latest Articles by Author
Latest Issues
function_exists() cannot determine the custom function Function test () {return true;} if (function_exists ('test')) {echo "test is function...
From 2024-04-29 11:01:01
0
3
2264
How to display the mobile version of Google Chrome Hello teacher, how can I change Google Chrome into a mobile version?
From 2024-04-23 00:22:19
0
11
2399
The child window operates the parent window, but the output does not respond. The first two sentences are executable, but the last sentence cannot be implemented.
From 2024-04-19 15:37:47
0
1
2012
There is no output in the parent window document.onclick = function(){ window.opener.document.write('I am the output of the child ...
From 2024-04-18 23:52:34
0
1
1894
Where is the courseware about CSS mind mapping? Courseware
From 2024-04-16 10:10:18
0
0
1966
Related Topics
More>
Popular Recommendations
Popular Tutorials
More>
Related Tutorials
Popular Recommendations
Latest courses
Latest Downloads
More>
Web Effects
Website Source Code
Website Materials
Front End Template