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：

<?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.','));  }}?>