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：
<?phpinclude "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.",")); }}?>更多关于PHP相关内容感兴趣的读者可查看本站专题：《PHP数据结构与算法教程》、《php程序设计算法总结》、《PHP常用遍历算法与技巧总结》、《PHP数学运算技巧总结》、《PHP数组(Array)操作技巧大全》、《php字符串(string)用法总结》及《php常见数据库操作技巧汇总》
希望本文所述对大家PHP程序设计有所帮助。
