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<?php function create_tree($arr,$pid=0) { $ret = array(); foreach($arr as $k => $v) { if($v['pid'] == $pid) { $tmp = $arr[$k];unset($arr[$k]); $tmp['children'] = create_tree($arr,$v['id']); $ret[] = $tmp; } } return $ret; } $arr = array( array('id'=>1,'pid'=>'0','name'=>'11111'), array('id'=>2,'pid'=>'1','name'=>'22222'), array('id'=>3,'pid'=>'0','name'=>'33333'), array('id'=>4,'pid'=>'3','name'=>'44444'), array('id'=>5,'pid'=>'4','name'=>'55555'), array('id'=>6,'pid'=>'1','name'=>'66666') ); echo "<pre>"; print_r(create_tree($arr));
Output for 4.3.0 - 7.1.0
<pre>Array ( [0] => Array ( [id] => 1 [pid] => 0 [name] => 11111 [children] => Array ( [0] => Array ( [id] => 2 [pid] => 1 [name] => 22222 [children] => Array ( ) ) [1] => Array ( [id] => 6 [pid] => 1 [name] => 66666 [children] => Array ( ) ) ) ) [1] => Array ( [id] => 3 [pid] => 0 [name] => 33333 [children] => Array ( [0] => Array ( [id] => 4 [pid] => 3 [name] => 44444 [children] => Array ( [0] => Array ( [id] => 5 [pid] => 4 [name] => 55555 [children] => Array ( ) ) ) ) ) ) )