Hello

I am applying the following function

<?php

function replaceChar($string){
    $new_string = preg_replace("/[^a-zA-Z0-9\sçéèêëñòóôõöàáâäåìíîïùúûüýÿ]/", "", $string);
    return $new_string;
}

$string = "This is some text and numbers 12345 and symbols !£%^#&$ and foreign letters éèêëñòóôõöàáâäåìíîïùúûüýÿ";

echo replaceChar($string);
?>

which works fine but if I add ã to the preg_replace like

$new_string = preg_replace("/[^a-zA-Z0-9\sçéèêëñòóôõöàáâãäåìíîïùúûüýÿ]/", "", $string);

$string = "This is some text and numbers 12345 and symbols !£%^#&$ and foreign letters éèêëñòóôõöàáâäåìíîïùúûüýÿã";

It conflicts with the pound sign £ and replaces the pound sign with the unidentified question mark in black square.

This is not critical but does anyone know why this is?

Thank you,

Barry