PHP general tree class can generate any tree structure

PHP general tree class can generate any tree structure_PHP tutorial

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Release： 2016-07-20 11:06:20

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php general tree class can generate any tree structure

php general tree class can generate any tree structure
class tree
{
/**
* 2-dimensional array required to generate tree structure
* @var array
*/
var $arr = array();

/**
* Modification symbols required to generate a tree structure, which can be replaced by images
* @var array
*/
var $icon = array('│','├','└');

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

/**
* Constructor, initialize class
* @param array 2-dimensional array, for example:
* array(
* 1 => array('id'=>'1','parentid '=>0,'name'=>'First-level column one'),
* 2 => array('id'=>'2','parentid'=>0,'name '=>'First-level column two'),
* 3 => array('id'=>'3','parentid'=>1,'name'=>'Second-level column 1'),
* 4 => array('id'=>'4','parentid'=>1,'name'=>'Second-level column two'),
* 5 => array('id'=>'5','parentid'=>2,'name'=>'Second-level column three'),
* 6 => array('id '=>'6','parentid'=>3,'name'=>'Third-level column one'),
* 7 => array('id'=>'7', 'parentid'=>3,'name'=>'Third-level column two')
* )
*/
function tree($arr=array())
{
$this->arr = $arr;
$this->ret = '';
return is_array($arr);
}

/**
* Get the parent array
* @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 child array
* @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 the tree structure
* @param int ID, which means to get all the children under this ID
* @param string The basic code to generate the tree structure, for example: ""
* @param int The selected ID, such as when making a tree drop-down box.
* @return string
*/
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 $this->ret;
}
    /**
* Similar to the previous method, but allows multiple selections
*/
function get_tree_multi($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.' : '.$selected.' .
';
    @extract($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.','));
}
}