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RecursiveFilterIterator::__construct is a constructor method provided by PHP for creating a RecursiveFilterIterator object.

The RecursiveFilterIterator is a class in PHP that allows filtering of elements in a recursive iterator, such as RecursiveDirectoryIterator.

The constructor method, RecursiveFilterIterator::__construct, is used to create a new RecursiveFilterIterator object. It takes two arguments:

1. RecursiveIterator $iterator: This is the object to be filtered. It should implement the RecursiveIterator interface, such as RecursiveDirectoryIterator.

2. callback $callback: This is an optional argument that specifies the callback function to be used for filtering elements in the iterator. The callback function should have the following signature:

bool callback ( mixed $current [, mixed $key [, RecursiveFilterIterator $iterator ]] )

The function should return true for elements that should be included in the filtered iterator, and false for elements that should be excluded.

Here is an example of how to use RecursiveFilterIterator::__construct:

php
class CustomFilter extends RecursiveFilterIterator
{
public function accept()
{
// Custom filtering logic here
// Return true or false based on the filtering condition
}
}

$dir = new RecursiveDirectoryIterator('/path/to/directory');
$filter = new CustomFilter($dir);


In this example, we create a custom filter class CustomFilter that extends RecursiveFilterIterator. Inside the accept method of the custom filter class, we can implement our custom filtering logic. Then, we create a RecursiveDirectoryIterator object ($dir) with the path to the directory to be iterated. Finally, we create a CustomFilter object ($filter) by passing the RecursiveDirectoryIterator object to the constructor of CustomFilter.

The resulting $filter object can be used to iterate over the filtered elements.

Please note that this is a basic example, and you would need to implement the accept method according to your specific filtering requirements.