'Php How can I convert Ö letter with iconv

I try to convert Turkish letter to English letter like ı->i ğ->g.I can translate almost most letter but except for ö,ü. Is there a method or article you can recommend?

my code:

$text="ödeme yöntem Şeçinizİ ü,ö";
var_dump(iconv("utf-8","ascii//TRANSLIT",$text));


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