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PHP无限分类[增强版]

时间:2021-07-01 10:21:17 帮助过:24人阅读

  1. /**
  2. +------------------------------------------------
  3. * 通用的树型类
  4. +------------------------------------------------
  5. * @author yangyunzhou@foxmail.com
  6. +------------------------------------------------
  7. * @date 2010年11月23日10:09:31
  8. +------------------------------------------------
  9. */
  10. class Tree
  11. {
  12. /**
  13. +------------------------------------------------
  14. * 生成树型结构所需要的2维数组
  15. +------------------------------------------------
  16. * @author yangyunzhou@foxmail.com
  17. +------------------------------------------------
  18. * @var Array
  19. */
  20. var $arr = array();
  21. /**
  22. +------------------------------------------------
  23. * 生成树型结构所需修饰符号,可以换成图片
  24. +------------------------------------------------
  25. * @author yangyunzhou@foxmail.com
  26. +------------------------------------------------
  27. * @var Array
  28. */
  29. var $icon = array('│','├',' └');
  30. /**
  31. * @access private
  32. */
  33. var $ret = '';
  34. /**
  35. * 构造函数,初始化类
  36. * @param array 2维数组,例如:
  37. * array(
  38. * 1 => array('id'=>'1','parentid'=>0,'name'=>'一级栏目一'),
  39. * 2 => array('id'=>'2','parentid'=>0,'name'=>'一级栏目二'),
  40. * 3 => array('id'=>'3','parentid'=>1,'name'=>'二级栏目一'),
  41. * 4 => array('id'=>'4','parentid'=>1,'name'=>'二级栏目二'),
  42. * 5 => array('id'=>'5','parentid'=>2,'name'=>'二级栏目三'),
  43. * 6 => array('id'=>'6','parentid'=>3,'name'=>'三级栏目一'),
  44. * 7 => array('id'=>'7','parentid'=>3,'name'=>'三级栏目二')
  45. * )
  46. */
  47. function tree($arr=array())
  48. {
  49. $this->arr = $arr;
  50. $this->ret = '';
  51. return is_array($arr);
  52. }
  53. /**
  54. * 得到父级数组
  55. * @param int
  56. * @return array
  57. */
  58. function get_parent($myid)
  59. {
  60. $newarr = array();
  61. if(!isset($this->arr[$myid])) return false;
  62. $pid = $this->arr[$myid]['parentid'];
  63. $pid = $this->arr[$pid]['parentid'];
  64. if(is_array($this->arr))
  65. {
  66. foreach($this->arr as $id => $a)
  67. {
  68. if($a['parentid'] == $pid) $newarr[$id] = $a;
  69. }
  70. }
  71. return $newarr;
  72. }
  73. /**
  74. * 得到子级数组
  75. * @param int
  76. * @return array
  77. */
  78. function get_child($myid)
  79. {
  80. $a = $newarr = array();
  81. if(is_array($this->arr))
  82. {
  83. foreach($this->arr as $id => $a)
  84. {
  85. if($a['parentid'] == $myid) $newarr[$id] = $a;
  86. }
  87. }
  88. return $newarr ? $newarr : false;
  89. }
  90. /**
  91. * 得到当前位置数组
  92. * @param int
  93. * @return array
  94. */
  95. function get_pos($myid,&$newarr)
  96. {
  97. $a = array();
  98. if(!isset($this->arr[$myid])) return false;
  99. $newarr[] = $this->arr[$myid];
  100. $pid = $this->arr[$myid]['parentid'];
  101. if(isset($this->arr[$pid]))
  102. {
  103. $this->get_pos($pid,$newarr);
  104. }
  105. if(is_array($newarr))
  106. {
  107. krsort($newarr);
  108. foreach($newarr as $v)
  109. {
  110. $a[$v['id']] = $v;
  111. }
  112. }
  113. return $a;
  114. }
  115. /**
  116. * -------------------------------------
  117. * 得到树型结构
  118. * -------------------------------------
  119. * @author yangyunzhou@foxmail.com
  120. * @param $myid 表示获得这个ID下的所有子级
  121. * @param $str 生成树形结构基本代码, 例如: ""
  122. * @param $sid 被选中的ID, 比如在做树形下拉框的时候需要用到
  123. * @param $adds
  124. * @param $str_group
  125. */
  126. function get_tree($myid, $str, $sid = 0, $adds = '', $str_group = '')
  127. {
  128. $number=1;
  129. $child = $this->get_child($myid);
  130. if(is_array($child)) {
  131. $total = count($child);
  132. foreach($child as $id=>$a) {
  133. $j=$k='';
  134. if($number==$total) {
  135. $j .= $this->icon[2];
  136. } else {
  137. $j .= $this->icon[1];
  138. $k = $adds ? $this->icon[0] : '';
  139. }
  140. $spacer = $adds ? $adds.$j : '';
  141. $selected = $id==$sid ? 'selected' : '';
  142. @extract($a);
  143. $parentid == 0 && $str_group ? eval("\$nstr = \"$str_group\";") : eval("\$nstr = \"$str\";");
  144. $this->ret .= $nstr;
  145. $this->get_tree($id, $str, $sid, $adds.$k.' ',$str_group);
  146. $number++;
  147. }
  148. }
  149. return $this->ret;
  150. }
  151. /**
  152. * 同上一方法类似,但允许多选
  153. */
  154. function get_tree_multi($myid, $str, $sid = 0, $adds = '')
  155. {
  156. $number=1;
  157. $child = $this->get_child($myid);
  158. if(is_array($child))
  159. {
  160. $total = count($child);
  161. foreach($child as $id=>$a)
  162. {
  163. $j=$k='';
  164. if($number==$total)
  165. {
  166. $j .= $this->icon[2];
  167. }
  168. else
  169. {
  170. $j .= $this->icon[1];
  171. $k = $adds ? $this->icon[0] : '';
  172. }
  173. $spacer = $adds ? $adds.$j : '';
  174. $selected = $this->have($sid,$id) ? 'selected' : '';
  175. @extract($a);
  176. eval("\$nstr = \"$str\";");
  177. $this->ret .= $nstr;
  178. $this->get_tree_multi($id, $str, $sid, $adds.$k.' ');
  179. $number++;
  180. }
  181. }
  182. return $this->ret;
  183. }
  184. function have($list,$item){
  185. return(strpos(',,'.$list.',',','.$item.','));
  186. }
  187. /**
  188. +------------------------------------------------
  189. * 格式化数组
  190. +------------------------------------------------
  191. * @author yangyunzhou@foxmail.com
  192. +------------------------------------------------
  193. */
  194. function getArray($myid=0, $sid=0, $adds='')
  195. {
  196. $number=1;
  197. $child = $this->get_child($myid);
  198. if(is_array($child)) {
  199. $total = count($child);
  200. foreach($child as $id=>$a) {
  201. $j=$k='';
  202. if($number==$total) {
  203. $j .= $this->icon[2];
  204. } else {
  205. $j .= $this->icon[1];
  206. $k = $adds ? $this->icon[0] : '';
  207. }
  208. $spacer = $adds ? $adds.$j : '';
  209. @extract($a);
  210. $a['name'] = $spacer.' '.$a['name'];
  211. $this->ret[$a['id']] = $a;
  212. $fd = $adds.$k.' ';
  213. $this->getArray($id, $sid, $fd);
  214. $number++;
  215. }
  216. }
  217. return $this->ret;
  218. }
  219. }
  220. ?>

  1. 用法:
  2. $tree = new Tree; // new 之前请记得包含tree文件!
  3. $tree->tree($data); // 数据格式请参考 tree方法上面的注释!
  4. // 如果使用数组, 请使用 getArray方法
  5. $tree->getArray();
  6. // 下拉菜单选项使用 get_tree方法
  7. $tree->get_tree();

增强版, PHP

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