按ASC顺序排序

Question

9th May 2018    
9th May 2018
9th June 2018
9th August 2018     
8th May 2018
7th June 2018
7th June 2018

如何按升序对这些日期进行排序，并且这些日期位于关联数组中。

Answer 1

使用usort可以定义任何自定义排序顺序，在这种情况下，将字符串转换为时间并进行比较：

$array = array("1" => "9th May 2018",
    "2" => "9th May 2018",
    "3" => "9th June 2018",
    "4" => "9th August 2018",
    "5" => "8th May 2018",
    "6" => "7th June 2018",
    "7" => "7th June 2018",
);

usort($array, function ($a, $b) {
    return strtotime($a) > strtotime($b);
});

var_dump($array);