I have a class which extends to include a mysql class.

Within the class's functions i have multiple calls (without creating an
object like '$instance = new MysqlDb()'  ) to the  mysql class like this:

function doThis(){


do something else here....



My question is whether I should beware of two instances of the mysql object
getting mixed up somehow. I feel I should clear each instance after use,
like I would nullify a variable with $var="";

My scripts seem to run fine, but i wonder if the above is bad practice...


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