no access to API inside custom function

[froot]

namespace ProcessWire; 
function myfunction() {
echo $config->paths->assets; // Notice: Undefined variable: config (…)
}

can't access the API inside a custom function. Didn't have that problem before.

This seems like a basic setting. What could be the reason?

[kongondo]

2 hours ago, fruid said:

Didn't have that problem before.

Nope. It's never been possible. You must be confusing this with something else. Nothing to do with ProcessWire. Many (most?/all?) languages have variable scope. $config is outside the variable scope of myfunction(). myfunction() doesn't know what config is. You have to tell it. Having a namespace declaration has nothing to do with it.

namespace ProcessWire; 
// alternative 1: use the global wire() function - @see: https://processwire.com/api/ref/functions/wire/
function myfunction() {
echo wire('config')->paths->assets; // no error
}
// alternative 2: pass in $config
function myfunction2($config) {
echo $config->paths->assets; // no error
}

alternative 3: functions API - e.g. https://processwire.com/api/ref/functions/config/ @see also: https://processwire.com/api/ref/functions/

Edited September 19, 2020 by kongondo

[froot]

it doesn't know $page or $pages either…

[BillH]

In what @kongondo suggests, replace "config" with "page" or "pages".

[Frank Vèssia]

On 9/19/2020 at 6:59 PM, fruid said:

it doesn't know $page or $pages either…

it doesn't work for the same reason $config doesn't work, use wire('page') inside functions

[LostKobrakai]

In PHP functions do not inherit variables from the parent scope. Even closures (unlike many other languages) don't do so unless explicitly stated by `function() use ($var, …) {}`