php 无限级分类，超级简单的无限级分类，支持输出树状图,代码来自网络, 只是自己用了挺长时间特地拿出来分享给大家
无平台限制
只需要告知id,parentid,name 即可
array('id'=>'1','parentid'=>0,'name'=>'一级栏目一'), * 2 => array('id'=>'2','parentid'=>0,'name'=>'一级栏目二'), * 3 => array('id'=>'3','parentid'=>1,'name'=>'二级栏目一'), * 4 => array('id'=>'4','parentid'=>1,'name'=>'二级栏目二'), * 5 => array('id'=>'5','parentid'=>2,'name'=>'二级栏目三'), * 6 => array('id'=>'6','parentid'=>3,'name'=>'三级栏目一'), * 7 => array('id'=>'7','parentid'=>3,'name'=>'三级栏目二') * ) */ function tree($arr=array()) {$this->arr = $arr;$this->ret = '';return is_array($arr); }/** * 得到父级数组 * @param int * @return array */ function get_parent($myid) {$newarr = array();if(!isset($this->arr[$myid])) return false;$pid = $this->arr[$myid]['parentid'];$pid = $this->arr[$pid]['parentid'];if(is_array($this->arr)){foreach($this->arr as $id => $a){if($a['parentid'] == $pid) $newarr[$id] = $a;}}return $newarr; }/** * 得到子级数组 * @param int * @return array */ function get_child($myid) {$a = $newarr = array();if(is_array($this->arr)){foreach($this->arr as $id => $a){if($a['parentid'] == $myid) $newarr[$id] = $a;}}return $newarr ? $newarr : false; }/** * 得到当前位置数组 * @param int * @return array */ function get_pos($myid,&$newarr) {$a = array();if(!isset($this->arr[$myid])) return false;$newarr[] = $this->arr[$myid];$pid = $this->arr[$myid]['parentid'];if(isset($this->arr[$pid])){$this->get_pos($pid,$newarr);}if(is_array($newarr)){krsort($newarr);foreach($newarr as $v){$a[$v['id']] = $v;}}return $a; }/*** -------------------------------------* 得到树型结构* -------------------------------------* @author abc* @param $myid 表示获得这个id下的所有子级* @param $str 生成树形结构基本代码, 例如: \$spacer\$name* @param $sid 被选中的id, 比如在做树形下拉框的时候需要用到* @param $adds* @param $str_group*/ function get_tree($myid, $str, $sid = 0, $adds = '', $str_group = '') {$number=1;$child = $this->get_child($myid);if(is_array($child)) {$total = count($child);foreach($child as $id=>$a) {$j=$k='';if($number==$total) {$j .= $this->icon[2];} else {$j .= $this->icon[1];$k = $adds ? $this->icon[0] : '';}$spacer = $adds ? $adds.$j : '';$selected = $id==$sid ? 'selected' : '';@extract($a);$parentid == 0 && $str_group ? eval(\$nstr = \$str_group\;) : eval(\$nstr = \$str\;);$this->ret .= $nstr;$this->get_tree($id, $str, $sid, $adds.$k.' ',$str_group);$number++;}}return $this->ret; }/** * 同上一方法类似,但允许多选 */ function get_tree_multi($myid, $str, $sid = 0, $adds = '') {$number=1;$child = $this->get_child($myid);if(is_array($child)){$total = count($child);foreach($child as $id=>$a){$j=$k='';if($number==$total){$j .= $this->icon[2];}else{$j .= $this->icon[1];$k = $adds ? $this->icon[0] : '';}$spacer = $adds ? $adds.$j : '';$selected = $this->have($sid,$id) ? 'selected' : '';@extract($a);eval(\$nstr = \$str\;);$this->ret .= $nstr;$this->get_tree_multi($id, $str, $sid, $adds.$k.' ');$number++;}}return $this->ret; }function have($list,$item){return(strpos(',,'.$list.',',','.$item.',')); }/**+------------------------------------------------* 格式化数组+------------------------------------------------* @author abc+------------------------------------------------*/ function getarray($myid=0, $sid=0, $adds='') {$number=1;$child = $this->get_child($myid);if(is_array($child)) {$total = count($child);foreach($child as $id=>$a) {$j=$k='';if($number==$total) {$j .= $this->icon[2];} else {$j .= $this->icon[1];$k = $adds ? $this->icon[0] : '';}$spacer = $adds ? $adds.$j : '';@extract($a);$a['name'] = $spacer.' '.$a['name'];$this->ret[$a['id']] = $a;$fd = $adds.$k.' ';$this->getarray($id, $sid, $fd);$number++;}}return $this->ret; }}$data=array(1 => array('id'=>'1','parentid'=>0,'name'=>'一级栏目一'),2 => array('id'=>'2','parentid'=>0,'name'=>'一级栏目二'),3 => array('id'=>'3','parentid'=>1,'name'=>'二级栏目一'),4 => array('id'=>'4','parentid'=>1,'name'=>'二级栏目二'),5 => array('id'=>'5','parentid'=>2,'name'=>'二级栏目三'),6 => array('id'=>'6','parentid'=>3,'name'=>'三级栏目一'),7 => array('id'=>'7','parentid'=>3,'name'=>''),8 => array('id'=>'8','parentid'=>3,'name'=>'三级栏目三'),9 => array('id'=>'9','parentid'=>7,'name'=>'四级分类三'),); $tree = new tree;$tree->tree($data);// 如果使用数组, 请使用 getarray方法 //$tree->getarray(); // 下拉菜单选项使用 get_tree方法 $html=''; $str = \$spacer\$name; $html .= $tree->get_tree(0,$str,-1).''; echo $html; ?>
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