PHP不使用递归的无限级分类简单实例

不用递归实现无限级分类，简单测试了下性能比递归稍好一点点点，但写得太复杂了，还是递归简单方便点

代码：

<?php
$list = array(
  array("id"=>1, "pid"=>0, "deep"=>0, "name"=>"test1"),
  array("id"=>2, "pid"=>1, "deep"=>1, "name"=>"test2"),
  array("id"=>3, "pid"=>0, "deep"=>0, "name"=>"test3"),
  array("id"=>4, "pid"=>2, "deep"=>2, "name"=>"test4"),
  array("id"=>5, "pid"=>2, "deep"=>2, "name"=>"test5"),
  array("id"=>6, "pid"=>0, "deep"=>0, "name"=>"test6"),
  array("id"=>7, "pid"=>2, "deep"=>2, "name"=>"test7"),
  array("id"=>8, "pid"=>5, "deep"=>3, "name"=>"test8"),
  array("id"=>9, "pid"=>3, "deep"=>2, "name"=>"test9"),
);
function resolve($list) {
  $newList = $manages = $deeps = $inDeeps = array();
  foreach ($list as $row) {
    $newList[$row["id"]] = $row;
  }
  $list = null;
  foreach ($newList as $row) {
    if (! isset($manages[$row["pid"]]) || ! isset($manages[$row["pid"]]["children"][$row["id"]])) {
      if ($row["pid"] > 0 && ! isset($manages[$row["pid"]]["children"])) $manages[$row["pid"]] = $newList[$row["pid"]];
      $manages[$row["pid"]]["children"][$row["id"]] = $row;
    }
    if (! isset($inDeeps[$row["deep"]]) || ! in_array($row["id"], $inDeeps[$row["deep"]])) {
      $inDeeps[$row["deep"]][] = array($row["pid"], $row["id"]);
    }
  }
  krsort($inDeeps);
  array_shift($inDeeps);
  foreach ($inDeeps as $deep => $ids) {
    foreach ($ids as $m) {
      // 存在子栏目的进行转移
      if (isset($manages[$m[1]])) {
        $manages[$m[0]]["children"][$m[1]] = $manages[$m[1]];
        $manages[$m[1]] = null;
        unset($manages[$m[1]]);
      }
    }
  }
  return $manages[0]["children"];
}

递归实现

function resolve2(& $list, $pid = 0) {
  $manages = array();
  foreach ($list as $row) {
    if ($row["pid"] == $pid) {
      $manages[$row["id"]] = $row;
      $children = resolve2($list, $row["id"]);
      $children && $manages[$row["id"]]["children"] = $children;
    }
  }
  return $manages;
}

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