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HomeBackend DevelopmentPHP TutorialLaravel框架illuminatesupportcollection排序问题

Laravel框架illuminate\support\collection排序问题技术

maybe yes 发表于2015-04-03 00:59

Laravel 的 Collection 的排序有个问题,前几天折腾了好久,一直怀疑是自己代码有问题。Collection 对象执行 sort 后需要执行 values 方法,否则 Collection 对象的 items 排序结果没有生效。当然手动的 toArray() 是生效的。查看 Collection sort 方法内部实现是调用了 PHP 的 uasort 函数,该函数排序后会维持原来的 key => value 关系。

官方文档截取如下:

Collection values()Reset the keys on the underlying array.Return ValueCollection

一直弄不明白,为什么这个方法叫 values,这个取名真让人费解,values 方法内部使用 array_values 方法对 items 进行了重新赋值。有时候,开发特别折腾,一直在更改... 代码片段如下,需要调用 values 方法使得排序生效。

$left = $right = null;switch($sortby){    case "rating":    case "month_sales":        $left = -1;        $right = 1;        break;    case "order_lead_time":    case "minimum_order_amount":        $left = 1;        $right = -1;        break;}if($ascending === "1"){    $left = 1;    $right = -1;}elseif($ascending === "0"){    $left = -1;    $right = 1;}$restaurants->sort(function($a, $b) use ($sortby, $left, $right){    return ($a->{$sortby} >= $b->{$sortby}) ? $left : $right;});$restaurants->values();

开发过程中特别的挑刺,过分的在乎变量命名和参数方式,过早的优化代码,都是不好的。这个世界上应该没有哪两家的公司的业务是完全一样的,用了太多的开源软件也不一定是好事。顺便评价下 Laravel,传说中的 Artisan,我感觉用起来很不舒畅,错误日志不打印日期,不打印哪里出错,叫人怎么调试。

sort 方法 和 values 方法内部实现代码:

public function sort(Closure $callback){    uasort($this->items, $callback);    return $this;}public function values(){    $this->items = array_values($this->items);    return $this;}

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