查找数组的键 [英] Find array keys

问题描述

在PHP我有一个数组，看起来像这样：

In PHP I have an array that looks like this:

$array[0]['width'] = '100';
$array[0]['height'] = '200';
$array[2]['width'] = '150';
$array[2]['height'] = '250';

• 我不知道有多少项目有数组中


• 某些项目可以删除这也解释了失踪[1]键。



我想在此之后添加一个新的项目，如：

I want to add a new item after this, like this:

$array[]['width'] = '300';
$array[]['height'] = '500';

然而，code以上不工作，因为它增加了对每行一个新的密钥。它应该是上面两行相同的。一个聪明的办法来解决呢？

However the code above don't work, because it adds a new key for each row. It should be the same for the two rows above. A clever way to solve it?

另一种解决方案是要找到的最后一个键。我没有尝试'端'功能。

An alternative solution would be to find the last key. I failed trying the 'end' function.

推荐答案

如果你不介意它失去这些键，你可以很容易地重新索引解决这个问题。

If you don't mind it losing those keys, you could easily fix the problem by re-indexing.

$array = array_values($array);
$i = count($array);
$array[$i]['width'] = '300';
$array[$i]['height'] = '500';

不过，如果你不想这样做，你也可以使用这样的：

However, if you don't want to do this, you could also use this:

$array[] = array(
    'width' => '300',
    'height' => '500'
);

这将创建一个新的数组，并将其插入作为第二个维度。

Which will create a new array and inserts it as a second dimension.

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