Question

我要在日期字段订购包含客户评论的数组。从最新日期到最早的日期。

$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Laravel控制器中或使用PHP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']) ;
    }

这会向我返回此错误：

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

Answer 1

假设$testimonials是集合对象，则可以使用sortByDesc()按日期降序排序。

<?php 

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

dd($testimonials);

Answer 2

在Laravel中，您可以这样做：

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

在PHP中，您可以使用usort来达到相同的目的

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

在Laravel中按日期排序数组

2 个答案: