How to use php to create an infinite tree menu [general tree type]-PHP Tutorial-php.cn

生成树型结构所需要的2维数组,var $arr = array()数组格式如下：

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') )

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生成树型结构所需修饰符号，可以换成图片：

var $icon = array('│','├','└'); var $ret = ''; var $html='';

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构造函数，初始化类：

function tree($arr=array()) { $this->arr = $arr; $this->ret = ''; return is_array($arr); }

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得到父级数组函数：

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; }

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得到子级数组函数：

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; }

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得到当前位置数组：

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; }

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得到树型结构：

　　$myid 表示获得这个ID下的所有子级;$str 生成树形结构基本代码, 例如: "";$sid 被选中的ID, 比如在做树形下拉框的时候需要用到;函数如下：

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 = $a["id"]==$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; }

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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.',')); }

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格式化数组函数：

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; }

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将数组转化为树形数组函数：

public function arrToTree($data,$pid){ $tree = array(); foreach($data as $k => $v){ if($v['parentID'] == $pid){ $v['parentID'] = $this->arrToTree($data,$v['id']); $tree[] = $v; } } return $tree; }

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左边菜单栏输出函数：

public function outToHtml($tree){ $html = ''; foreach($tree as $t){ if(empty($t['parentID'])){ $html .= "$t[name]
"; }else{ $html .=''.$t['name'].''; $html .= $this->outToHtml($t['parentID']); $html = $html.'
'; } } return $html; }

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实例化调用tree类格式如下：

$tree = new tree; $tree->tree($categorys); echo "";

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