PHP Infinite Classification and support output tree graph detailed Introduction _php tips

Copy Code code as follows:

<?php
/**
* Universal Tree class, which can generate any tree-type structure
*/
Class Tree
{
/**
* 2-D arrays required to generate a tree structure
* @var Array
*/
var $arr = array ();

/**
* Create the tree structure of the required modifiers, you can change to a picture
* @var Array
*/
var $icon = array (' │ ', ' ├ ', ' └ ');

/**
* @access Private
*/
var $ret = ';

/**
* Constructors, initializing classes
* @param array of array 2 dimensions, for example:
* Array (
* 1 => Array (' ID ' => ' 1 ', ' ParentID ' =>0, ' name ' => ' one-level column one '),
* 2 => Array (' ID ' => ' 2 ', ' ParentID ' =>0, ' name ' => ' one-level column II '),
* 3 => Array (' ID ' => ' 3 ', ' ParentID ' =>1, ' name ' => ' Level two column one '),
* 4 => Array (' ID ' => ' 4 ', ' ParentID ' =>1, ' name ' => ' Level two column two '),
* 5 => Array (' ID ' => ' 5 ', ' ParentID ' =>2, ' name ' => ' Level two column '),
* 6 => Array (' ID ' => ' 6 ', ' ParentID ' =>3, ' name ' => ' Level three column one '),
* 7 => Array (' ID ' => ' 7 ', ' ParentID ' =>3, ' name ' => ' Level three column two ')
*      )
*/
function tree ($arr =array ())
{
$this->arr = $arr;
$this->ret = ';
Return Is_array ($arr);
}

/**
* Get the parent progression Group
* @param int
* @return Array
*/
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;
}

/**
* Get the Sub series Group
* @param int
* @return Array
*/
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;
}

/**
* Get the current position array
* @param int
* @return Array
*/
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;
}


/**
* -------------------------------------
* Get a tree-shaped structure
* -------------------------------------
* @author Midnight (Yang Yunzhou), yangyunzhou@foxmail.com
* @param $myid means to get all the children under this ID
* @param $str generate a tree-structured codebase, such as: "<option value=\ $id \ $select >\ $spacer \ $name </option>"
* @param $sid the selected ID, for example, when making a tree drop-down box
* @param $adds
* @param $str _group
* @return Unknown_type
*/
function Get_tree ($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 = $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 $this->ret;
}
/**
* The previous method is similar, but allows multiple selections
*/
function Get_tree_multi ($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 ': ';
echo $sid. ' => '. $id. ': '. $selected. <br/> ';
@extract ($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. '));
}
}
?>