NestedKeyIterator

Class NestedKeyIterator This iterator iterates recursively through an array, returning as the current key an imploded list of the stacked keys separated by a given separator.

Example:

$ary = [
     'foo' => 'bar',
     'baz' => ['foo' => ['uh' => 'ah'], 'oh' => 'eh']
]
foreach (new NestedKeyIterator($ary) as $key => $value) {
 echo "$key: value\n",
}

prints foo: bar baz.foo.uh: ah baz.oh: eh