替换＆nbsp; ＆安培; ＆复制; 和另一个ISO-8859-1 by regex在php中

i need replace   & © and another &******; and replace it to ""
preg_replace or ereg_replace, i need some code

tried

$string = "one two&three©four";
$r = preg_replace('/^&+(\w)+;/', '--', $string);
echo $r;

it's incorrect

Drop the initial ^. You want to match anywhere in the string, not just the start of the string.

preg_replace('/&+(\w)+;/', '--', $string);
 → string(21) "one--two--three--four"

To be more precise, this:

preg_replace('/&#?+(\w)+;/', '--', $string);

will cut out also numeric codes like ¢ and ¢.