PHP树形结构tree类用法示例

本文实例讲述了PHP树形结构tree类用法。分享给大家供大家参考,具体如下:

<?php

include 'tree.class.php';

//模拟数据库

$data=array(

array('id'=>1,'pid'=>0,'name'=>'一级栏目一'),

array('id'=>2,'pid'=>0,'name'=>'一级栏目二'),

array('id'=>3,'pid'=>1,'name'=>'二级栏目一'),

array('id'=>4,'pid'=>3,'name'=>'三级栏目一'),

array('id'=>5,'pid'=>4,'name'=>'四级栏目一'),

);

//转换数据

$tree_data=array();

foreach ($data as $key=>$value){

$tree_data[$value['id']]=array(

'id'=>$value['id'],

'parentid'=>$value['pid'],

'name'=>$value['name']

);

}

/**

* 输出树形结构

*/

$str="<tr>

<td><input type='checkbox' name='list[\$id]' value='\$id'></td>

<td>\$id</td>

<td>\$spacer\$name</td>

<td><a href='add.php?id=\$id'>添加</a></td>

<td><a href='del.php?id=\$id'>删除</a></td>

<td><a href='update.php?id='\$id'>修改</a></td>

</tr>";

$tree=new Tree();

$tree->init($tree_data);

echo "<table>";

echo $tree->get_tree(0, $str);

echo "</table>";

echo "<br/>";

echo "<br/>";

echo "<br/>";

echo "<br/>";

/**

* 输出下拉列表

*/

$str="<option value=\$id \$selected>\$spacer\$name</option>";

$tree=new Tree();

$tree->init($tree_data);

echo "<select>";

echo $tree->get_tree(0, $str,2);

echo "</select>";

运行结果:

tree.class.php:

<?php

/**

* 通用的树型类,可以生成任何树型结构

*/

class tree {

/**

* 生成树型结构所需要的2维数组

* @var array

*/

public $arr = array();

/**

* 生成树型结构所需修饰符号,可以换成图片

* @var array

*/

public $icon = array('│','├','└');

public $nbsp = " ";

/**

* @access private

*/

public $ret = '';

/**

* 构造函数,初始化类

* @param array 2维数组,例如:

* 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'=>'三级栏目二')

* )

*/

public function init($arr=array()){

$this->arr = $arr;

$this->ret = '';

return is_array($arr);

}

/**

* 得到父级数组

* @param int

* @return array

*/

public 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

*/

public 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

*/

public 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

* @param int ID,表示获得这个ID下的所有子级

* @param string 生成树型结构的基本代码,例如:"<option value=\$id \$selected>\$spacer\$name</option>"

* @param int 被选中的ID,比如在做树型下拉框的时候需要用到

* @return string

*/

public 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 $id=>$value){

$j=$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($value);

$parentid == 0 && $str_group ? eval("\$nstr = \"$str_group\";") : eval("\$nstr = \"$str\";");

$this->ret .= $nstr;

$nbsp = $this->nbsp;

$this->get_tree($id, $str, $sid, $adds.$k.$nbsp,$str_group);

$number++;

}

}

return $this->ret;

}

/**

* 同上一方法类似,但允许多选

*/

public 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;

}

/**

* @param integer $myid 要查询的ID

* @param string $str 第一种HTML代码方式

* @param string $str2 第二种HTML代码方式

* @param integer $sid 默认选中

* @param integer $adds 前缀

*/

public function get_tree_category($myid, $str, $str2, $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);

if (empty($html_disabled)) {

eval("\$nstr = \"$str\";");

} else {

eval("\$nstr = \"$str2\";");

}

$this->ret .= $nstr;

$this->get_tree_category($id, $str, $str2, $sid, $adds.$k.' ');

$number++;

}

}

return $this->ret;

}

/**

* 同上一类方法,jquery treeview 风格,可伸缩样式(需要treeview插件支持)

* @param $myid 表示获得这个ID下的所有子级

* @param $effected_id 需要生成treeview目录数的id

* @param $str 末级样式

* @param $str2 目录级别样式

* @param $showlevel 直接显示层级数,其余为异步显示,0为全部限制

* @param $style 目录样式 默认 filetree 可增加其他样式如'filetree treeview-famfamfam'

* @param $currentlevel 计算当前层级,递归使用 适用改函数时不需要用该参数

* @param $recursion 递归使用 外部调用时为FALSE

*/

function get_treeview($myid,$effected_id='example',$str="<span class='file'>\$name</span>", $str2="<span class='folder'>\$name</span>" ,$showlevel = 0 ,$style='filetree ' , $currentlevel = 1,$recursion=FALSE) {

$child = $this->get_child($myid);

if(!defined('EFFECTED_INIT')){

$effected = ' id="'.$effected_id.'"';

define('EFFECTED_INIT', 1);

} else {

$effected = '';

}

$placeholder = '<ul><li><span class="placeholder"></span></li></ul>';

if(!$recursion) $this->str .='<ul'.$effected.' class="'.$style.'">';

foreach($child as $id=>$a) {

@extract($a);

if($showlevel > 0 && $showlevel == $currentlevel && $this->get_child($id)) $folder = 'hasChildren'; //如设置显示层级模式@2011.07.01

$floder_status = isset($folder) ? ' class="'.$folder.'"' : '';

$this->str .= $recursion ? '<ul><li'.$floder_status.' id=\''.$id.'\'>' : '<li'.$floder_status.' id=\''.$id.'\'>';

$recursion = FALSE;

if($this->get_child($id)){

eval("\$nstr = \"$str2\";");

$this->str .= $nstr;

if($showlevel == 0 || ($showlevel > 0 && $showlevel > $currentlevel)) {

$this->get_treeview($id, $effected_id, $str, $str2, $showlevel, $style, $currentlevel+1, TRUE);

} elseif($showlevel > 0 && $showlevel == $currentlevel) {

$this->str .= $placeholder;

}

} else {

eval("\$nstr = \"$str\";");

$this->str .= $nstr;

}

$this->str .=$recursion ? '</li></ul>': '</li>';

}

if(!$recursion) $this->str .='</ul>';

return $this->str;

}

/**

* 获取子栏目json

* Enter description here ...

* @param unknown_type $myid

*/

public function creat_sub_json($myid, $str='') {

$sub_cats = $this->get_child($myid);

$n = 0;

if(is_array($sub_cats)) foreach($sub_cats as $c) {

$data[$n]['id'] = iconv(CHARSET,'utf-8',$c['catid']);

if($this->get_child($c['catid'])) {

$data[$n]['liclass'] = 'hasChildren';

$data[$n]['children'] = array(array('text'=>' ','classes'=>'placeholder'));

$data[$n]['classes'] = 'folder';

$data[$n]['text'] = iconv(CHARSET,'utf-8',$c['catname']);

} else {

if($str) {

@extract(array_iconv($c,CHARSET,'utf-8'));

eval("\$data[$n]['text'] = \"$str\";");

} else {

$data[$n]['text'] = iconv(CHARSET,'utf-8',$c['catname']);

}

}

$n++;

}

return json_encode($data);

}

private function have($list,$item){

return(strpos(',,'.$list.',',','.$item.','));

}

}

?>

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