如何根据嵌套数组中的列过滤多维数组？

Question

假设我有一个如下所示的数组：

$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",
                        ], 
    ], 

];

我想过滤这个数组，所以它只包含值不为空的详细信息。 Airco 的 type 值为空，因此它不应返回详细的 type。在这种情况下，返回的数组应如下所示：

$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代码（如此处找到的）基于空列过滤数组：

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

但是由于我有一个嵌套数组details，我不太确定如何调整此代码以使其适合我的情况。

Answer 1

您的array_filter仅在第一级起作用。您还希望在 details 数组上进行循环，您可以使用简单的 foreach 循环来完成此操作。外部循环将遍历所有行，内部循环将遍历每行的详细信息。

<?php

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

现场演示