PHP 递归数组搜索

Question

我使用以下函数递归搜索数组：

function search2($array, $key){
    if( array_key_exists($key, $array) ){
        print("<br> ----------------- FOUND <u>{$key}</u> with value: {$array[$key]}");

        return array( $key => $array[$key] );

    }else if( !array_key_exists($key, $array) ){
        foreach ($array as $index   =>  $subarray){
                if( is_array($subarray) ){
                    print("<br> ************* <u>{$index}</u> is an ARRAY");
                    print("<br> ************* RE-SEACHING <u>{$index}</u> FOR : <u>{$key}</u>");
                    search2($subarray, $key);
                }
        }
    }
}

因此，具有以下数组结构：

Array
(
    [personal] => Array
        (
            [title] => 
            [forename] => 
            [surname] => 
            [post_code] => 
            [date_of_birth] => Array
                (
                    [month] => 
                    [day] => 
                    [year] => 
                )

            [email_address] => email1@test.org
            [confirm_email_address] => 
            [mobile_telephone] => 
            [home_telephone] => 
            [work_telephone] => 
            [are_you_entering_fundraising_in_a_team] => Array
                (
                    [yes] => 0
                )

            [how_many_places_would_you_like] => 
            [team_name] => 
            [names_of_team_members] => 
            [how_did_you_hear_about_this_event] => 
            [please_tell_us_] => 
            [would_you_be_happy_for_publicity] => 
            [is_this_the_first_time_you_have_taken_part_in_or_attended_this_event] => Array
                (
                    [yes] => 0
                )

            [do_you_have_a_special_reason_for_taking_part_in_or_attending_this_event] => 
            [what_are_your_plans_for_raising_the_minimum_sponsorship_amount___please_be_as_detailed_as_possible] => 
            [number_of_tickets_required] => 1
        )
)

我的函数将继续调用自身，直到找到我正在搜索的索引。如果我正在搜索email_address，如果该数组键存在，则 if 语句的第一部分应返回该索引的值，否则它将在代码的第二部分中进入递归模式。

问题是代码似乎有效，因为我得到了“找到”的打印语句，如下所示：

print("<br> ----------------- FOUND <u>{$key}</u> with value: {$array[$key]}");

但是，我希望 return 语句能够执行预期的操作，但在函数调用时没有得到任何输出。

Answer 1

您还可以使用内置函数array_walk_recursive并提供回调。