php anonymous function example 1 (use)

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<?php
$data = array(&#39;first&#39; => 1, 'second' => 2, 'third' => 3);
$data = array_filter($data, function ($item) use (&$data) {
    echo "Filtering key ", key($data), '<br>', PHP_EOL;
    next($data);
    return false;
});
?>

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