# RecursiveCallbackFilterIterator::__construct

(PHP 5 >= 5.4.0, PHP 7, PHP 8)

RecursiveCallbackFilterIterator::__construct — Create a RecursiveCallbackFilterIterator from a RecursiveIterator

### 说明

public RecursiveCallbackFilterIterator::__construct(RecursiveIterator `$iterator`, callable `$callback`)

Creates a filtered iterator from a RecursiveIterator using the `callback` to determine which items are accepted or rejected.

### 参数

`iterator`

  The recursive iterator to be filtered.

`callback`

  The callback, which should return `true` to accept the current item or `false` otherwise. See Examples.

  May be any valid callable value.

### 参见

- RecursiveCallbackFilterIterator Examples
- RecursiveCallbackFilterIterator::getChildren() - Return the inner iterator's children contained in a RecursiveCallbackFilterIterator
- RecursiveCallbackFilteriterator::hasChildren() - Check whether the inner iterator's current element has children

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