php通用的树型类创建无限级树型菜单
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')
)
生成树型结构所需修饰符号，可以换成图片：
var $icon = array('│','├','└');var $ret = '';var $html='';构造函数，初始化类：
function tree($arr=array())
{
$this->arr = $arr;
$this->ret = '';
return is_array($arr);
}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 $newarr;
}得到子级数组函数：
function get_child($myid)
{ $a = $newarr = array(); if(is_array($this->arr))
{ foreach($this->arr as $id => $a)
{ if(@$a['parentID'] == $myid) { $newarr[$id] = $a;
}
}
} return $newarr ? $newarr : false;
}得到当前位置数组：
function get_pos($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 $a;
}得到树型结构：
str 生成树形结构基本代码, 例如: "<option value=\sid 被选中的ID, 比如在做树形下拉框的时候需要用到;函数如下：
function get_tree($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 $this->ret;
}同上一方法类似,但允许多选：
function get_tree_multi($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.',',','.$item.','));
}格式化数组函数：
function getArray($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 $this->ret;
}将数组转化为树形数组函数：
public function arrToTree($data,$pid){ $tree = array(); foreach($data as $k => $v){ if($v['parentID'] == $pid){ $v['parentID'] = $this->arrToTree($data,$v['id']); $tree[] = $v;
}
}
return $tree;
}左边菜单栏输出函数：
public function outToHtml($tree){ $html = ''; foreach($tree as $t){ if(empty($t['parentID'])){ $html .= "<li><a href=\"javascript:\" onclick=\"$.bringBack({id:'$t[id]',name:'$t[name]'})\">$t[name]</a></li>";
}else{ $html .='<li><a href="javascript:">'.$t['name'].'</a><ul>'; $html .= $this->outToHtml($t['parentID']); $html = $html.'</ul></li>';
}
}
return $html;
}实例化调用tree类格式如下：
$tree = new tree; $tree->tree($categorys); echo "<select name=\"f_id\" >"; echo "<option value='0' >添加一级分类</option>"; //get_tree(父ID,格式化字符窜,默认选中哪个分类,修饰前缀,父级分类样式) 前面两个必填，后面三个可选 $data .= $tree->get_tree(0, "<option value='\$id' \$selected>\$spacer\$name</option>\n", 0, '' , "<optgroup label='\$name'></optgroup>"); echo $data; echo "</select>";
