[英]PHP RecursiveIteratorIterator not outputting all keys
I have the following multidimensional array: 我有以下多维数组:
$array = array(
1 => null,
2 => array(
3 => null,
4 => array(
5 => null,
),
6 => array(
7 => null,
),
)
);
If I use the following code to iterate over the array 如果我使用以下代码遍历数组
$iterator = new RecursiveIteratorIterator(new RecursiveArrayIterator($array));
foreach ($iterator as $key => $value) {
echo $key.' ';
}
it only outputs the keys with no arrays assigned to them. 它只输出没有分配数组的键。 Ie
即
1 3 5 7
How can I get it to include all of the keys? 如何获得包含所有密钥的信息?
You just need to set the mode right. 您只需要正确设置模式即可。 From the manual :
从手册 :
RecursiveIteratorIterator::SELF_FIRST - Lists leaves and parents in iteration with parents coming first.
RecursiveIteratorIterator :: SELF_FIRST-列出迭代中的叶子和父对象 ,其中父对象排在第一位。
$iterator = new RecursiveIteratorIterator(new RecursiveArrayIterator($array)
, RecursiveIteratorIterator::SELF_FIRST);
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