在多维数组中按值搜索键

Question

使用PHP的网站作为参考我试图在关联数组中搜索已知值的键：

http://php.net/manual/en/function.array-search.php

以下代码始终返回1，但假设返回120：

$location_key = array_search(1, array_column($locations, 'main'));

的print_r（$位置）：

Array
(
    [120] => Array
        (
            [clientid] => 122103
            [name] => HQ
            [address] => 2013 BENSON GARDEN BLVD
            [address2] => 
            [city] => OMAHA
            [state] => NE
            [zip] => 68134
            [country] => UNITED STATES
            [lat] => 00.000
            [lng] => -0.0000
            [taxrate] => 0
            [main] => 1
            [active] => 1
            [contactid] => 14
        )

    [122] => Array
        (
            [clientid] => 122103
            [name] => Branch
            [address] => 515E E 72ND ST
            [address2] => 
            [city] => NEW YORK
            [state] => NY
            [zip] => 10021
            [country] => UNITED STATES
            [lat] => 40.766705
            [lng] => -73.952965
            [taxrate] => 0
            [main] => 0
            [active] => 1
            [contactid] => 0
        )

)

不确定为什么PHP的网站引用了最高投票和＃34;用户贡献的注释＆＃34;哪个不起作用。

Answer 1

这是因为array_column()没有保留您的密钥。因此，首先需要array_combine()来自array_column()的数组的密钥，例如

$location_key = array_search(1, array_combine(array_keys($locations), array_column($locations, 'main')));