PHP:获取关联数组的第n个项目 [英] PHP: Get n-th item of an associative array

问题描述

如果您有关联数组:

Array
(
    [uid] => Marvelous
    [status] => 1
    [set_later] => Array
        (
            [0] => 1
            [1] => 0
        )

    [op] => Submit
    [submit] => Submit
)

您想访问第二项，该怎么做? $arr[1]似乎不起作用:

And you want to access the 2nd item, how would you do it? $arr[1] doesn't seem to be working:

foreach ($form_state['values']['set_later'] as $fieldKey => $setLater) {
    if (! $setLater) {
        $valueForAll = $form_state['values'][$fieldKey];
        $_SESSION[SET_NOW_KEY][array_search($valueForAll, $form_state['values'])] = $valueForAll; // this isn't getting the value properly
    }
}

该代码应产生:

$_SESSION[SET_NOW_KEY]['status'] = 1

但是它只会产生一个空白条目.

But it just produces a blank entry.

推荐答案

使用 array_slice

$second = array_slice($array, 1, 1, true);  // array("status" => 1)

// or

list($value) = array_slice($array, 1, 1); // 1

// or

$blah = array_slice($array, 1, 1); // array(0 => 1)
$value = $blah[0];

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