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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