Programmatically write an associative array of functions - php

Question

I have a lot of functions stored in an associative array like this :
$arr['my-title'] = function(){process(146,'My Title');};
$arr['un-cafe-chaud'] = function(){process(857,'Un café chaud');};
$arr['vpn'] = function(){process(932,'VPN');};
$arr['another-example'] = function(){process(464,'Another example');};
Currently I have to encode manually each key.
As the key name is function of the Title, I'd like to automate it.
function assign_keys($title,$id){
$u=str_replace(array(' ','é'),array('-','e'),strtolower($title));
$arr[$u] = function(){process($id,$title);};
}
But it doesn't work, as process function can't get $id and $title value.
Any help on how I could handle this would be highly appreciated ! Thank you.

Answer 1

First of all, you should pass $arr as argument to the function in order to be able to mutate it. Second, you should use use to make those two variables available in the anonymous function, like this:
function assign_keys($title,$id, &$arr){
$u=str_replace(array(' ','é'),array('-','e'),strtolower($title));
$arr[$u] = function() use ($id, $title){process($id,$title);};
}
Then use it like this:
$arr = [];
assign_keys('Some title', 123, $arr);
var_dump($arr);
This should print:
array(1) {
["some-title"]=>
object(Closure)#1 (1) {
["static"]=>
array(2) {
["id"]=>
int(123)
["title"]=>
string(10) "Some title"
}
}
}

Answer 2

You probably want a reference & to get the array outside of the function and use to get the variables into the closure:
function assign_keys($title, $id, &$arr){
$u = str_replace(array(' ','é'), array('-','e'), strtolower($title));
$arr[$u] = function() use($title, $id) { process($id, $title); };
}
assign_keys('My Title', 146, $arr);