关联php数组中的下一个元素 [英] next element in a associative php array

问题描述

这似乎很简单，但我无法弄清楚

This seems so easy but i cant figure it out

$users_emails = array(
'Spence' => '[e-mail]', 
'Matt'   => '[e-mail]', 
'Marc'   => '[e-mail]', 
'Adam'   => '[e-mail]', 
'Paul'   => '[e-mail]');

我需要获取数组中的下一个元素，但是我无法弄清楚……所以例如

I need to get the next element in the array but i cant figure it out... so for example

如果我有

$users_emails['Spence']

我需要返回[e-mail]，如果返回

I need to return [e-mail] and if Its

$users_emails['Paul'] 

我需要从头开始，然后返回[e-mail]

i need start from the top and return [e-mail]

我尝试过

$next_user = (next($users_emails["Spence"]));

这也是

 ($users_emails["Spence"] + 1 ) % count( $users_emails )

但是他们没有返回我所期望的

but they dont return what i am expecting

推荐答案

reset($array);
while (list($key, $value) = each($array)) { ...

Reset()将数组指针回退到第一个元素，each()返回当前元素的键和值作为数组，然后移至下一个元素.

Reset() rewind the array pointer to the first element, each() returns the current element key and value as an array then move to the next element.

list($key, $value) = each($array);
// is the same thing as
$key = key($array); // get the current key
$value = current($array); // get the current value
next($array); // move the internal pointer to the next element

要导航，可以使用next($array)，prev($array)，reset($array)，end($array)，同时使用current($array)和/或key($array)读取数据.

To navigate you can use next($array), prev($array), reset($array), end($array), while the data is read using current($array) and/or key($array).

或者，如果您遍历所有这些，则可以使用foreach

Or you can use foreach if you loop over all of them

foreach ($array as $key => $value) { ...

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