通用树形类+无限级分类
<?php // +--------------------------------------------------------------------------------------------------- // | Before finding the right people, the only need to do is to make yourself good enough. // +--------------------------------------------------------------------------------------------------- // | Author: LongDD <741886920@qq.com> 2013.4.23 // +--------------------------------------------------------------------------------------------------- // | Description: 通用树形类+无限级分类 // +--------------------------------------------------------------------------------------------------- /* * Example * $arr = array( 1 => array('id' => '1', 'pid' => 0, 'name' => '一级栏目一'), 2 => array('id' => '2', 'pid' => 0, 'name' => '一级栏目二'), 3 => array('id' => '3', 'pid' => 1, 'name' => '二级栏目一'), 4 => array('id' => '4', 'pid' => 1, 'name' => '二级栏目二'), 5 => array('id' => '5', 'pid' => 2, 'name' => '二级栏目三'), 6 => array('id' => '6', 'pid' => 3, 'name' => '三级栏目一'), 7 => array('id' => '7', 'pid' => 3, 'name' => '三级栏目二') ); $tree = new tree($arr); $rst = $tree->get_list(); Header("Content-Type:text/html;charset=utf-8"); echo '<pre>'; print_r($rst); * */ class tree { /** * 生成树型结构所需要的2维数组 * @var array */ var $arr = array(); /** * 生成树型结构所需修饰符号，可以换成图片 * @var array */ var $icon = array('│', '├', '└'); /** * 默认样式 * @var string */ var $style = "<option value='\$id' selected='\$selected'>\$spacer\$name</option>"; /** * 生成的书型结构字符串 * @access private */ var $ret = ''; /** * 生成列表 * @access private */ var $list = array(); /** * 构造函数，初始化类 * @param array 2维数组，例如： * array( * 1 => array('id'=>'1','pid'=>0,'name'=>'一级栏目一'), * 2 => array('id'=>'2','pid'=>0,'name'=>'一级栏目二'), * 3 => array('id'=>'3','pid'=>1,'name'=>'二级栏目一'), * 4 => array('id'=>'4','pid'=>1,'name'=>'二级栏目二'), * 5 => array('id'=>'5','pid'=>2,'name'=>'二级栏目三'), * 6 => array('id'=>'6','pid'=>3,'name'=>'三级栏目一'), * 7 => array('id'=>'7','pid'=>3,'name'=>'三级栏目二') * ) */ public function __construct($arr = array()) { $this->arr = $arr; $this->ret = ''; $this->list = array(); return is_array($arr); } /** * 获取父类 * @param int $cid 子元素id * @return array 父类数组 */ public function get_parent($cid) { $arr = array(); if (!isset($this->arr[$cid])) return FALSE; $pid = $this->arr[$cid]['pid']; foreach ($this->arr as $v) { if ($v['id'] == $pid) { $arr = $v; } } return $arr; } /** * 获取所有父类（与父类同级) * @param int $cid 子元素id * @return array 父类数组（二维数组） */ public function get_parents($cid) { $arr = array(); if (!isset($this->arr[$cid])) return FALSE; $pid_c = $this->arr[$cid]['pid']; $pid = $this->arr[$pid_c]['pid']; foreach ($this->arr as $v) { if ($v['id'] == $pid) { $arr[] = $v; } } return $arr; } /** * 获取子类 * @param int $name 父id * @return unkonow */ public function get_child($pid = 0) { $arr = array(); if (!is_array($this->arr)) return FALSE; foreach ($this->arr as $v) { if ($v['pid'] == $pid) { $arr[] = $v; } } return $arr ? $arr : FALSE; } /** * ------------------------------------- * 得到树型结构 * ------------------------------------- * @param $pid 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: "<option value='\$id' select='\$select'>\$spacer\$name</option>" * @param $sid 被选中的ID, 比如在做树形下拉框的时候需要用到 * @param $adds 前缀 * @return unknown_type */ public function get_tree($pid = 0, $str = FALSE, $sid = 0, $adds = '') { if ($str === FALSE) $str = $this->style; $number = 1; $child = $this->get_child($pid); 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); eval("\$nstr = \"$str\";"); $this->ret .= $nstr; $this->get_tree($id, $str, $sid, $adds . $k . ' '); $number++; } } return $this->ret; } /** * 生成数组 * @param int $pid 根id * return array */ public function get_array($pid = 0) { $arr = array(); foreach ($this->arr as $k => $v) { if ($v['pid'] == $pid) { $arr[$k] = $v; $arr[$k]['child'] = $this->get_array($v['id']); } } return $arr; } /** * 生成列表 * @param int $pid 根id * @param string $cont 生成语句 "\$name" * @param string $prefix 前缀 <li> * @param string $suffix 后缀 </li> * @param string $prefix_p 前缀 <ul> * @param string $suffix_P 后缀 </ul> * @return array */ public function get_list($pid = 0, $cont = "\$name", $prefix = '<li>', $suffix = '</li>', $prefix_p = '<ul>', $suffix_p = '</ul>') { $str = ''; $str.= $prefix_p; $arr = $this->get_child($pid); if ($arr !== FALSE) { foreach ($arr as $v) { $str.= $prefix; @extract($v); eval("\$ncont = \"$cont\";"); $str.= $ncont; $str.= $this->get_list($v['id'], $cont, $prefix, $suffix); $str.= $suffix; } } $str.= $suffix_p; return $str; } } /* End of file myTree.php */ /* Location: ./myTree.php */
配套前台js ：http://www.cnblogs.com/longdidi/archive/2013/04/23/3037917.html
