在 Laravel 中按日期排序数组答案

【问题标题】：Order a array by date in Laravel在 Laravel 中按日期排序数组
【发布时间】：2020-07-02 08:48:19
【问题描述】：

我想通过字段 date 订购一个包含客户 cmets 的数组。从最新日期到最早日期。

$testimonials = array:356 [▼
0 => array:4 [▼
    "comment" => "blahblahblahblahblah"
    "name" => "John"
    "date" => "12/04/2019"
]
1 => array:4 [▼
  "comment" => "blah blah blah blah blah"
  "name" => "Franky V"
  "date" => "13/05/2019"
]
2 => array:4 [▼
  "comment" => "lololololol"
  "name" => "Peter"
  "date" => "06/03/2020"
]
3 => array:4 [▼
  "comment" => "blahblahblahblahblahblahblahblahblah"
  "name" => "Hugo"
  "date" => "24/01/2019"
]
....

我想得到这个结果：

$testimonials = array:356 [▼
  0 => array:4 [▼
    "comment" => "lololololol"
    "name" => "Peter"
    "date" => "06/03/2020"
  ]
  1 => array:4 [▼
    "comment" => "blah blah blah blah blah"
    "name" => "Franky V"
    "date" => "13/05/2019"
  ]
  2 => array:4 [▼
    "comment" => "blahblahblahblahblah"
    "name" => "John"
    "date" => "12/04/2019"
  ]
  3 => array:4 [▼
    "comment" => "blahblahblahblahblahblahblahblahblah"
    "name" => "Hugo"
    "date" => "24/01/2019"
  ]

如何在我的 Laravel 控制器或 PHP 中做到这一点？

编辑：我正在尝试使用 usort，但我弄错了

public function getTrollingDates($testimonials) {
        $currentdate = new DateTime();
        $currentdate = $currentdate->format('Y-m-d');

        foreach($testimonials as &$testimonial) {
            $testimonial['date'] = $this->getRandomDate('2019-01-01',$currentdate);
        }

        $testimonials = usort($testimonials, 'compare');



        return $testimonials;
    }


    public function compare($a, $b)    {
        return  strtotime($b['date']) - strtotime($a['date']) ;
    }

这会返回这个错误：

usort() expects parameter 2 to be a valid callback, function 'compare' not found or invalid function name

【问题讨论】：

我想这个链接会是你的答案。 https://stackoverflow.com/questions/37567751/laravel-sort-an-array-by-date/52368760
我认为这篇文章会对你有所帮助。 https://stackoverflow.com/questions/37567751/laravel-sort-an-array-by-date/52368760

标签： php laravel datetime laravel-5

【解决方案1】：

在Laravel 你可以这样做：

$array = collect($testimonials)->sortBy('date')->reverse()->toArray();

在PHP 中，您可以使用usort 来实现相同的效果

function compare($a, $b)    {

   // if you want to sort by ascending
    return  strtotime($b['date']) - strtotime($a['date']) ;

    //if you want to sort by descending order
    // return  strtotime($a['date'])  - strtotime($b['date'])  ;
}
usort($my_array, 'compare');

PHP -> usort

【讨论】：

@AntonioMorales 将 usort($testimonials, 'compare'); 更改为 usort($testimonials, $this->compare);
现在抛出这个新错误：未定义属性：App\Http\Controllers\WebController::$compare
@AntonioMorales 而不是 function 尝试 anonymous function : usort($testimonials, function($a, $b){ return strtotime($b['date']) - strtotime($a['date']) ; });
不工作：usort() 期望参数 2 是一个有效的回调，没有给出数组或字符串
试试这个：$array = collect($testimonials)->sortBy('date')->reverse()->toArray();

【解决方案2】：

假设$testimonials是一个集合对象，你可以利用sortByDesc()按日期降序排序。

<?php 

$testimonials = $testimonials->sortByDesc(function($a){
    return DateTime::createFromFormat('d/m/Y',$a['date']);
});

dd($testimonials);

【讨论】：

@AntonioMorales 什么样的新约会？它在我的机器上运行良好。