比较和打印数组中的相同值

Question

我想比较下面这样的数组中的数据并合并相同的数据。

Array (    [0] => Array
(
[0] => 2019-10-21
[1] => Remzi
)
[1] => Array
(
[0] => 2019-10-21
[1] => Ahmet
)
[2] => Array
(
[0] => 2019-10-14
[1] => Ali
) )

我想得到这样的输出：

2019-10-21, Remzi - Ahmet (Same birtday) <br>
2019-10-14, Ali (different birtday)

我该怎么做？

Answer 1

这样做，

$birthday_dic = [];
foreach($birthdays as $birthday){
$birthday_dic[$birthday[0]][] = $birthday[1];
}
$birthday_dic = array_map(function($v){return join(" - ",$v);},$birthday_dic);
print_r($birthday_dic);