str_replace Ð to &

I want to replace the char Ð into &.

im trying the following sim开发者_JAVA技巧ple str_replace

str_replace("Ð","&",$string)

but somehow is not working..

str_replace returns its result, it doesn't change its argument.

$string = str_replace("Ð","&",$string);

Maybe is a problem with charsets.. a workaround could be use htmlentities() on the string and replace strings in its output.