An unnset-variable default value?

[afrigal]

alot of time in programming the value of variables are passed through url parameters, in php; \[code\]if (isset($_GET['var'])) {$var = $_GET['var'];}\[/code\]But if that does not execute, we will have an unset variable, in which may cause errors in the remaining of the code, i usually set the variable to '' or false; \[code\]else {$var = '';}\[/code\]I was wondering what are the best practices, and why : ) thank you!