php – 根据条件对数组进行排序

$records = array(

    array("postId"=>"1","grid"=>"6"),array("postId"=>"2","grid"=>"3"),array("postId"=>"3",array("postId"=>"4",array("postId"=>"5",array("postId"=>"6","grid"=>"12"),array("postId"=>"7",);

$records=array(

    array("postId"=>"1",);

$records = array(

    array("postId"=>"1",array("postId"=>"8",);

所以你不是真正的排序,而是重新排序以创建序列.我想你正在尝试做一些固定高度的砖块布局,你需要重新排序以填充每一行,并将其余部分留在最后.使用12,3的给定固定变体,可以通过按降序对其进行排序来完成 – 奇数个六,它将填充较小的三个.然而,这样的顺序将产生无聊的布局 – 让它更有趣你只需要重新排序一些帖子.为此,您需要创建临时容器并在其网格总和等于12时合并它.如果您留下一些临时容器,请将它们合并为一个并在与先前分组合并之前按降序排序.

代码说明我的概念：

//auxiliary function to calculate sum of grids in given temporary container
    function reduc($a) {
    return array_reduce($a,function ($result,$item) {
        return $result . $item['grid'] . ',';
    },'');
}

function regroup($records,$group_sum = 12) {
    $temp = array();
    $grouped = array();

    foreach ($records as $r) {
        if ($r['grid'] == $group_sum) {
            $grouped[] = $r;
        } else {
            if (!$temp) {
                $temp[] = array($r);
            } else {
                $was_grouped = false;
                foreach ($temp as $idx => $container) {
                    $current_sum = sum_collection($container);
                    if ($current_sum + $r['grid'] <= $group_sum) {
                        $temp[$idx][] = $r;
                        if ($current_sum + $r['grid'] == $group_sum) {
                            $grouped = array_merge($grouped,$temp[$idx]);
                            unset($temp[$idx]);
                        }
                        $was_grouped = true;
                        break;
                    }
                }
                if (!$was_grouped) {
                    $temp[] = array($r);
                }
            }
        }
    }

    if ($temp) {
        //Sort descending,so biggest ones will be filled first with smalller
        $rest = call_user_func_array('array_merge',$temp);
        usort($rest,function($a,$b) {
            return $b['grid'] - $a['grid'];
        });
        $grouped = array_merge($grouped,$rest);
    }

    return $grouped;
}