<?php
$string =" Eu não recomendaria o uso de expressões regulares, pois é desnecessário, a menos que você realmente queira, por algum motivo ";
$ultima_palavra = strrchr($string,' ');
echo '|' . $ultima_palavra . '|';
$string = ' JOÃO FULANO DE TAL ';
echo '|' . $ultima_palavra . '|';
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