escaping characters

hi now i know why this doesnt work

$handle = @fopen(“users.txt”, “a”);
if(!$handle)
{die(“Error opening file to writing”);}
fwrite($handle, “,'”.$username.”‘”);
fclose($handle);

but when i try to escape the ,’ or the ‘ it doesnt work what am i doing wrong could someone show me the correct way to get this working?

this is the error i get, i presume its becuase they are unescaped, Parse error: parse error, expecting `‘,” or `‘;” in /home/richardt/public_html/james/register.php on line 25

Thanks
Rich

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