Description:
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It seems that DirectoryIterator::getChildren() does not exist as shown in the documentation.

http://php.net/manual/en/function.directoryiterator-getchildren.php

Should be RecrusiveDirectoryIterator::getChildren()

Reproduce code:
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<?php

$DirectoryIterator = new DirectoryIterator('/var/www/foo');
var_dump($DirectoryIterator->getChildren());

?>

Expected result:
----------------
return children of directory

Actual result:
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Fatal error: Call to undefined method DirectoryIterator::getChildren()