I'm new to fat free framework and i'm a little bit confused about the global variables.
$f3->route('GET /@page','display');
function display($f3) {
echo 'I cannot object to an object' . $f3->get('PARAMS.page');
};
$f3->run();
Here i'm using GET /@page as a token for the url route. In the function i then use $f3->get('PARAMS.page') to get the value of that variable.
Since $f3->get is the method to get a global variable, why do i have to pass the $f3 class to the function.
The below code doesn't work ($f3 class not passed to the function).
$f3->route('GET /@page','display');
function display() {
echo 'I cannot object to an object' . $f3->get('PARAMS.page');
};
$f3->run();
So my question is: why do i have to pass the $f3 class to the function?
Thx...
The F3 instance variable which is declared at the very start of your index.php (
$f3=require...
) can be retrieved anywhere in the code using the static call$f3=Base::instance()
.Anyway, for convenience purpose, at routing time this F3 instance as well as the route parameters are passed to the route handler. Therefore, instead of defining your route handler as:
you could define it as:
or even better:
These 3 functions are absolutely identical so you should pick up the one that you understand best. But you should remember that
$f3
and$params
are only passed at routing time, which means to 3 functions: the route handler, the beforeRoute() hook and the afterRoute() hook. Anywhere else in the code (including inside a class constructor), you should callBase::instance()
to retrieve the F3 instance.PS: your question being "why do i have to pass the $f3 class to the function?", I would suggest you to rename its title to reflect it.
UPDATE: Since release 3.2.1, the F3 instance is also passed to the constructor of the route handler class: