PHP比较多维数组

Question

我正在尝试比较两个数组，并从Array2中获取数据，如果Array1中的对应索引为空，则将其放入Array1中。 这是数组的示例。 第二个数组具有第一个数组没有的数据。

Array(
    [Customer] => Array(
        [sales_associate] => 
        [store] => 
    )
    [CustomerPersonalInformation] => Array(
        [first_name] => FirstName 
        [middle_initial] => 
        [last_name] => Lastname
        [gender] => 
    )
    [CustomerContactInformation] => Array(
        [primary_phone] => (111)111-1111
        [email] => email@gmail.com
        [street_address] => 
        [city] => 
        [state] => 
        [zip] => 
        [county] => 
    )
    [Marketing] => Array(
        [accepts_calls] => 
        [accepts_emails] => 
        [best_contact_time] => 
    )
)
Array(
    [Customer] => Array(
        [sales_associate] => Me
        [store] => There
    )
    [CustomerPersonalInformation] => Array(
        [first_name] => FirstName 
        [middle_initial] => E
        [last_name] => Lastname
        [gender] => 
    )
    [CustomerContactInformation] => Array(
        [primary_phone] => (111)111-1111
        [email] => email@gmail.com
        [street_address] => 
        [city] => 
        [state] => 
        [zip] => 
        [county] => 
    )
    [Marketing] => Array(
        [accepts_calls] => 
        [accepts_emails] => 
        [best_contact_time] => 
    )
)

我想不出如何遍历数组，因为索引不是数字。 我知道我必须使用foreach循环，但似乎无法解决这个问题。 这是我尝试的最后一件事（失败）：

foreach($firstArray as $element) {
    foreach($element as $value) {
        echo $value;
        echo $secondArray[$element][$value];
    }
}

Answer 1

遍历第二个数组，并检查元素是否在第一个数组中，如下所示：

foreach($secondArray as $elementKey => $elementContent) {
    if(! isset($firstArray[$elementKey]) || empty($firstArray[$elementKey])) {
        $firstArray[$elementKey] = $elementContent;
    }
    foreach($elementContent as $ecKey => $ecValue) {
        if(! isset($firstArray[$elementKey][$ecKey]) || empty($firstArray[$elementKey][$ecKey])) {
            $firstArray[$elementKey][$ecKey] = $ecValue;
        }
    }
}