<?php
$url = 'https://m...content-available-to-author-only...o.nz/#!4090kJrY!LZiZBgsOo_Gg1sLnykZLHsUThAC9oaPRG3---0gD92Y';
echo parse_url($url, PHP_URL_HOST
) . "\n"; //pega o HOST echo $array_url['host'] . "\n"; //aqui pega só o HOST também.
echo $dominio[0];
?>
//https://pt.stackoverflow.com/q/47771/101
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