用PHP中的月份名称和年份对数组进行排序

Question

我有一个像

$ar =['March 2018',
      'March 2018',
      'November 2017',
      'December 2017',
      'January 2018',
      'January 2018',
      'February 2018'
     ];

我想用月份和年份对该数组进行排序。 但是我无法对这个数组进行排序。

Expected Output: [
     'November 2017',
      'December 2017',
       'January 2018',
      'January 2018',
      'February 2018',
      'March 2018',
      'March 2018'
];

尝试过使用usort(), uksort() ....之类的函数usort(), uksort()但无法正常工作，请帮助我解决此问题

Answer 1

您可以使用usort并使用strtotime将字符串转换为时间。

$ar = ['March 2018',
  'March 2018',
  'November 2017',
  'December 2017',
  'January 2018',
  'January 2018',
  'February 2018'
];

usort( $ar , function($a, $b){
    $a = strtotime($a);
    $b = strtotime($b);
    return $a - $b;
});

echo "<pre>";
print_r( $ar );
echo "</pre>";

这将导致：

Array
(
    [0] => November 2017
    [1] => December 2017
    [2] => January 2018
    [3] => January 2018
    [4] => February 2018
    [5] => March 2018
    [6] => March 2018
)