Question

我有列表或数组：

$var_menu_sub["1"]["1"] = "1|Sub Menu Label #1";
$var_menu_sub["1"]["2"] = "1|Sub Menu Label #2";
$var_menu_sub["1"]["3"] = "1|Sub Menu Label #3";
$var_menu_sub["2"]["this_key"] = "1|Change Password";
$var_menu_sub["3"]["1"] = "1|Sub Menu Label #1";
$var_menu_sub["3"]["2"] = "1|Sub Menu Label #2";

如果我只使用键“this_key”而不知道数组变量中的“2”键，那么如何获取值“Change Password”？

像这样（??? =平均动态）：

$var_menu_sub["???"]["this_key"] = "1|Change Password";

Answer 1

假设只有一个this_key：

echo current(array_column($var_menu_sub, 'this_key'));

如果有多个this_key，那么您只需要foreach超过结果：

foreach(array_column($var_menu_sub, 'this_key') as $value) {
    echo $value;
}

Answer 2

一种方法是：

<?php
$var_menu_sub["1"]["1"] = "1|Sub Menu Label #1";
$var_menu_sub["1"]["2"] = "1|Sub Menu Label #2";
$var_menu_sub["1"]["3"] = "1|Sub Menu Label #3";
$var_menu_sub["2"]["this_key"] = "1|Change Password";
$var_menu_sub["3"]["1"] = "1|Sub Menu Label #1";
$var_menu_sub["3"]["2"] = "1|Sub Menu Label #2";

// Loop over entire array
foreach ($var_menu_sub as $data) {
    //Loop over the array which is indexed by the key you know
    foreach ($data as $key => $value) {
        // Look for that key
        if ($key == 'this_key') {
            echo $value;
        }
    }
}

使用多维数组中的第二个键获取值

2 个答案: