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@ 2013-02-22T04:49:17Z

<?php
function treeArray($data)
{    
    $result = array();        
    $p = array();        
    foreach($data as $val)    
    {        
        if($val['pid'] == 0)        
        {            
            $i = count($result);            
            $result[$i] = isset($p[$val['id']])? array_merge($val,$p[$val['id']]) : $val;            
            $p[$val['id']] = & $result[$i];        
        } 
        else 
        {            
            $i = count($p[$val['pid']]['children']);            
            $p[$val['pid']]['children'][$i] = $val;            
            $p[$val['id']] = & $p[$val['pid']]['children'][$i];        
        }    
    }    
    return $result;
}
$data  = array(array('id'=>1,'pid'=>'0','name'=>'11111'),    
              array('id'=>2,'pid'=>'1','name'=>'22222'),    
              array('id'=>3,'pid'=>'0','name'=>'33333'),    
              array('id'=>4,'pid'=>'3','name'=>'44444'),    
              array('id'=>5,'pid'=>'4','name'=>'55555'),    
              array('id'=>6,'pid'=>'1','name'=>'66666'));
print_r(treeArray($data));

Output for git.master, git.master_jit, rfc.property-hooks: Warning: Undefined array key "children" in /in/KMZIV on line 16 Fatal error: Uncaught TypeError: count(): Argument #1 ($value) must be of type Countable|array, null given in /in/KMZIV:16 Stack trace: #0 /in/KMZIV(29): treeArray(Array) #1 {main} thrown in /in/KMZIV on line 16
Process exited with code 255.

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2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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