Solution to exception when obtaining the number of affected rows after PHP updates mysql_PHP Tutorial

From the manual, I know that the mysql_affected_rows function will return an abnormal value when the data before and after UPDATE are the same.

There is a convenient solution below. From the official munual, I saw the message from bdobrica at gmail dot com:
As a solution to the problem pointed in the post reffering to mysql_affected_rows() returning 0 when you are making an update query and the fields are not modified although the query is valid, i'm posting the following function. It is very simple and based on a previous post.