您可以考虑转换版权/商标

参考： http ：//www.php.net/manual/en/function.htmlspecialchars.php

©版权符号：&＃ 169 ;

™商标符号：&＃153 ;

I am having a hard time understanding how to insert the registered trademark sybol and copyright symbol to my mySQL database using php.

When I insert the normal character of the reistered trademark symbol, it returns some random values when I try to retrieve it.

You can look into converting the copyright/trademark symbol from and into an HTMLEntity in order to ease data transfer to the database.

Reference: http://www.php.net/manual/en/function.htmlentities.php

Reference: http://www.php.net/manual/en/function.htmlspecialchars.php

© Copyright Symbol: &#169;

™ Trademark Symbol: &#153;