按鍵值對數組進行排序PHP

Question

我有這個數組：

Array
(
    [Alben] => Array
        (
            [Sgt._Pepper’s_Lonely_Hearts_Club_Band] => 
            [Rubber_Soul] => 
            [Please_Please_Me] => 
            [Let_It_Be_(Album)] => 
            [With_the_Beatles] => 
            [Let_It_Be…_Naked] => 
            [A_Hard_Day’s_Night_(Album)] => Rickenbacker_360-12WB_12_String.jpg
            [Beatles_for_Sale] => 
            [Help!_(Album)] => Semaphore_Victor.svg
            [Magical_Mystery_Tour_(Album)] => 
            [The_Beatles_(Album)] => 
            [Yellow_Submarine] => 
            [Abbey_Road] => The_End.jpg
            [Revolver_(Album)] => 
            [Anthology_(The_Beatles)] => 
            [A_Collection_of_Oldies_…_but_Goldies] => 
            [1_(Album)] => 
        )

)

現在，我想按值對它進行排序。 因此，這些鍵是第一個在值中具有img的鍵。 以及沒有這些條目的條目。 我嘗試了array_values但它返回了相同的Array。 也許會導致鑰匙“ Alben ”？

我試過了：

$returnArray = array_values($returnArray);

Answer 1

array_values將返回僅包含值的數組，並破壞關聯。 您可能需要使用uasort函數來執行此操作，在這里您可以為值提供自定義排序邏輯並維護索引關聯。 從PHP Docs：

此函數使用用戶定義的比較函數對數組進行排序，以使數組索引保持與與其關聯的數組元素的相關性。

這主要用於對實際元素順序很重要的關聯數組進行排序時。

（從它的推導中得出usort ：）

value_compare_func

如果第一個參數分別小於，等於或大於第二個參數，則比較函數必須返回小於，等於或大於零的整數。

這是您提供的代碼的示例：

<?php
// array reproducing
$collection = array(
        "Alben" => array (
                "Sgt._Pepper’s_Lonely_Hearts_Club_Band" => "",
                "Rubber_Soul" => "",
                "Please_Please_Me" => "",
                "Let_It_Be_(Album)" => "",
                "With_the_Beatles" => "",
                "Let_It_Be…_Naked" => "",
                "A_Hard_Day’s_Night_(Album)" => "Rickenbacker_360-12WB_12_String.jpg",
                "Beatles_for_Sale" => "",
                "Help!_(Album)" => "Semaphore_Victor.svg",
                "Magical_Mystery_Tour_(Album)" => "",
                "The_Beatles_(Album)" => "ble_test",
                "Yellow_Submarine" => "",
                "Abbey_Road" => "The_End.jpg",
                "Revolver_(Album)" => "",
                "Anthology_(The_Beatles)" => "",
                "A_Collection_of_Oldies_…_but_Goldies" => "",
                "1_(Album)" => "",
        ));

// callback of sorting, checks if the compared value is not empty then pushes it ahead.
// If not, pull it backwards.
$sortIfFilled = function ($a, $b) {
    return (!$a) ? 1 : -1;
};

// Executing it...
uasort($collection['Alben'], $sortIfFilled);

echo "<pre>";
print_r ($collection);

輸出：

Array
(
    [Alben] => Array
        (
            [The_Beatles_(Album)] => ble_test
            [Abbey_Road] => The_End.jpg
            [A_Hard_Day’s_Night_(Album)] => Rickenbacker_360-12WB_12_String.jpg
            [Help!_(Album)] => Semaphore_Victor.svg
            [Yellow_Submarine] => 
            [Let_It_Be…_Naked] => 
            [A_Collection_of_Oldies_…_but_Goldies] => 
            [Let_It_Be_(Album)] => 
            [Revolver_(Album)] => 
            [Beatles_for_Sale] => 
            [With_the_Beatles] => 
            [Sgt._Pepper’s_Lonely_Hearts_Club_Band] => 
            [Rubber_Soul] => 
            [Magical_Mystery_Tour_(Album)] => 
            [Anthology_(The_Beatles)] => 
            [Please_Please_Me] => 
            [1_(Album)] => 
        )

)

請仔細閱讀PHP Docs上的回調函數，它們可能會幫助您解決項目中的類似問題。