note 10488 modified in functions.arguments by felipe

Nice to know is this: If you call a function giving an unset variable, it will be unset in the function. Consider this: <?php function my_test ($var) { if (isset ($var)) echo ("set"); } my_test ($unused); ?> This will _not_ echo "set", regardless of the variable being passed by value or by reference. (If my newlines are messed up, sorry, this seems to be a konqueror problem) --was-- Nice to know is this: If you call a function giving an unset variable, it will be unset in the function. Consider this: function my_test ($var) { if (isset ($var)) echo ("set"); } my_test ($unused); This will _not_ echo "set", regardless of the variable being passed by value or by reference. (If my newlines are messed up, sorry, this seems to be a konqueror problem) http://php.net/manual/en/functions.arguments.php