将此关联数组转换为字符串或单索引数组 [英] Convert this associative array to a string or single indexed array

问题描述

我需要将此数组转换为一维索引数组或字符串.很高兴舍弃第一个键(0、1)并只保留值.

I need to convert this array into a single dimensional indexed array or a string. Happy to discard the first key (0, 1) and just keep the values.

$security_check_whitelist = array
  0 => 
    array
      'whitelisted_words' => string 'Happy' (length=8)
  1 => 
    array
      'whitelisted_words' => string 'Sad' (length=5)

我尝试使用array_values()，但返回的数组结构完全相同.

I tried array_values(), but it returned the exact same array structure.

这有效:

$array_walker = 0;
$array_size = count($security_check_whitelist);

while($array_walker <= $array_size)
{
   foreach($security_check_whitelist[$array_walker] as $security_check_whitelist_value)
    {
        $security_check[] = $security_check_whitelist_value;
    }
    $array_walker++;
}

但是它返回:

警告:为提供了无效的参数 foreach()

Warning: Invalid argument supplied for foreach()

如何在不收到警告消息的情况下转换关联数组?有更好的方法吗?

How can I convert the associative array without receiving the warning message? Is there a better way?

推荐答案

foreach ($security_check_whitelist as &$item) {
    $item = $item['whitelisted_words'];
}

或者简单地:

$security_check_whitelist = array_map('current', $security_check_whitelist);

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