如何根據嵌套數組中的列過濾多維數組？

Question

假設我有一個如下所示的陣列：

$array =    [    

    0 => [  
        "label"    =>  "Radiator",  
        "details"  =>   0 => [  
                            "label"     => "Condition",  
                            "value"     => "New",
                        ], 
                        1 => [  
                            "label"     => "Type",  
                            "value"     => "Wall",
                        ],
    ],  
    1 => [  
        "label"    =>  "Airco",  
        "details"  =>   0 => [  
                            "label"     => "Condition",  
                            "value"     => "New",
                        ], 
                        1 => [  
                            "label"     => "Type",  
                            "value"     => "",
                        ], 
    ], 
    2 => [  
        "label"    =>  "Refrigerator",  
        "details"  =>   0 => [  
                            "label"     => "Condition",  
                            "value"     => "Bad",
                        ], 
                        1 => [  
                            "label"     => "Type",  
                            "value"     => "Wall",
                        ], 
    ], 

];

我想過濾這個數組，所以它只包含值不為空的詳細資訊。 Airco 的 type 值為空，因此它不應傳回詳細的 type。在這種情況下，傳回的陣列應如下所示：

$array =    [    

    0 => [  
        "label"    =>  "Radiator",  
        "details"  =>   0 => [  
                            "label"     => "Condition",  
                            "value"     => "New",
                        ], 
                        1 => [  
                            "label"     => "Type",  
                            "value"     => "Wall",
                        ],
    ],  
    1 => [  
        "label"    =>  "Airco",  
        "details"  =>   0 => [  
                            "label"     => "Condition",  
                            "value"     => "New",
                        ],
    ], 
    2 => [  
        "label"    =>  "Refrigerator",  
        "details"  =>   0 => [  
                            "label"     => "Condition",  
                            "value"     => "Bad",
                        ], 
                        1 => [  
                            "label"     => "Type",  
                            "value"     => "Wall",
                        ], 
    ], 

];

我知道我可以使用以下程式碼（如此處找到的）基於空列過濾數組：

$result = array_filter($array, function($o) use($column) {
    return trim( $o[$column] ) !== '' && $o[$column] !== null;
});

但是由於我有一個巢狀數組details，我不太確定如何調整此程式碼以使其適合我的情況。

Answer 1

您的array_filter僅在第一層運作。您也希望在 details 陣列上進行循環，您可以使用簡單的 foreach 循環來完成此操作。外部循環將遍歷所有行，內部循環將遍歷每行的詳細資訊。

<?php

foreach($array as &$row){
    foreach($row['details'] as $key => $record){
        if(strlen($record['value']) == 0){
            unset($row['details'][$key]);
        }
    }
}

現場示範