Is it recommended to have a santizing function that combines two or more built in sanitizing functions in php?

Question

Is it okay to employ a function that sanitizes the incoming inputs due to a form submission or any other request. It is time saving but the question of effectivenss and efficien

Answer 1

each function serves its own purpose, you shouldn't use any function not for their intended use.

1. you should use mysql_real_escape_string before using the parameter in mysql query.
2. you should use htmlspecialchars before outputting to page.

that's about it.