Make a function redirect to other functions depending on a variable

function a() {
   global $connection;
}

var mediaId;

var mediaId = "";

def f(x, params):
    for i in len(x):
        # Pass in params[i] to f_i

def f_creator(params):
    def closure(x):
        for i in len(x):
            # Pass in params[i] to f_i
    return closure

f = f_creator(... params for f_is go in here...)
# Use f for any special calculations that you need

params = ....

def f(x):
    for i in len(x):
        # Calculate f_i using global params

#ifndef UTILS_H
#define UTILS_H   

const char* const ERROR_TYPE = "unknown type detected for big.matrix object!";

#endif // UTILS_H

#include <bigstatsr/utils.h>

// [[Rcpp::export]]
const char* const GET_ERROR_TYPE() {
  return ERROR_TYPE;
}

public function __construct()
{
    $this->auth = UserRepository::check();
}

public function test() {
  return dd($this->auth);
}