Standard input is empty

Array
(
    [0] => Array
        (
            [0] => <a href="http://e...content-available-to-author-only...e.com/abc" rel="link">string</a>
            [1] => http://e...content-available-to-author-only...e.com/abc
            [2] => string
        )

    [1] => Array
        (
            [0] => <a href="/local/path" title="with attributes">number</a>
            [1] => /local/path
            [2] => number
        )

    [2] => Array
        (
            [0] => <a href="#anchor" data-attr="lots">links</a>
            [1] => #anchor
            [2] => links
        )

)