<?php
$url = "https://w...content-available-to-author-only...e.com/watch?v=NZta28cFU3w";
echo $saida_de_variaveis['v']; // obtém o parâmetro 'v' da url
// Output: NZta28cFU3w
PD9waHAKCiR1cmwgPSAiaHR0cHM6Ly93Li4uY29udGVudC1hdmFpbGFibGUtdG8tYXV0aG9yLW9ubHkuLi5lLmNvbS93YXRjaD92PU5adGEyOGNGVTN3IjsKcGFyc2Vfc3RyKCBwYXJzZV91cmwoICR1cmwsIFBIUF9VUkxfUVVFUlkgKSwgJHNhaWRhX2RlX3ZhcmlhdmVpcyk7CmVjaG8gJHNhaWRhX2RlX3ZhcmlhdmVpc1sndiddOyAgICAvLyBvYnTDqW0gbyBwYXLDom1ldHJvICd2JyBkYSB1cmwgCiAgLy8gT3V0cHV0OiBOWnRhMjhjRlUzdw==