从多维数组中获取唯一值以及不等于未设置的值

Question

e.g。输入数组

array ([0] => Array
    (
        [date] => 2016-11-16
        [cook_book_id] => 89
        [occassion] => Not set
    )

[1] => Array
    (
        [date] => 2016-11-16
        [cook_book_id] => 90
        [occassion] => Diwali
    )

[2] => Array
    (
        [date] => 2016-11-16
        [cook_book_id] => 95
        [occassion] => Not set
    )
[3]  => Array
    (
        [date] => 2016-11-17    
        [cook_book_id] => 95
        [occassion] => Not set
    )
)

输出应

  array([0] => Array
    (
        [date] => 2016-11-16
        [cook_book_id] => 89
        [occassion] => Diwali
    )
    [1]  => Array
    (
        [date] => 2016-11-17
        [cook_book_id] => 95
        [occassion] => Not set
    )
)

在输入数组中，“date”和“Not Set”值从输入数组重复我希望唯一的日期值与occassion名称“diwali”（高优先级），如果没有则可以是任何值，则默认值应为“Not Set” “即如果未设置应该覆盖”排灯节“，否则它应该是”未设置“

Answer 1

如果我理解正确的话，可能就是这样。

<?php
$today = date('Y-m-d');

foreach($array as $key => $value){
    if($value['occassion'] === 'Not Set' && $value['date'] === $today){
        $array[$key]['occassion'] = 'Birthday';
    }
}