<?php
$chars = array('!', '@', '#'); echo str_replace($chars, '', 'oh! texto com # e @ para apagar!');
//https://pt.stackoverflow.com/q/45595/101
PD9waHAKJGNoYXJzID0gYXJyYXkoJyEnLCAnQCcsICcjJyk7CmVjaG8gc3RyX3JlcGxhY2UoJGNoYXJzLCAnJywgJ29oISB0ZXh0byBjb20gIyBlIEAgcGFyYSBhcGFnYXIhJyk7CgovL2h0dHBzOi8vcHQuc3RhY2tvdmVyZmxvdy5jb20vcS80NTU5NS8xMDE=