Common Helper for Codeigniter4

common_helper.php

<?php 
/**
 * I made this file just for make things easier in Codeigniter 4
 * Codeigniter4 is also support this function by default, but i don't know it feels like i need to make my own
 * 
 * 
 * @package Gaibz_Helper
 * @subpackage Helper
 * @category Helper
 * @author Herlangga Sefani Wijaya <https://github.com/gaibz> | 6 Feb 2020
 */



/**
 * Check Wether input array isset and not empty, return empty string if array is not set and empty / null
 * 
 * 
 * @param array $var = Array Variable 
 * @param string $index = Index of Array Variable
 * @return array value of array or empty string if not exists
 */
function empty_if_unset(array $var, $index){
	return (isset($var[$index]) && !empty($var[$index])) ? $var[$index] : "";
}

/**
 * Check Wether input array isset and not empty, return Boolean
 * 
 * 
 * @param array $var = Array Variable 
 * @param string $index = Index of Array Variable
 * @return boolean
 */
function isset_not_empty(array $var, $index){
	return (isset($var[$index]) && !empty($var[$index])) ? true : false;
}


/**
 * Get HTTP INPUT from POST, GET, REQUEST, SERVER, PUT, PATCH, DELETE, or AUTO for autodetect
 * This will become handy for building RESTful API.
 * AUTO will search from HTTP REQUEST METHOD param 
 * return empty if not set
 *
 * <code>
 * $input = get_http_input("username", "AUTO"); 
 * $input = get_http_input("username", "auto");
 * </code>
 * 
 * @param string $req_var = Request Variable
 * @param string $req_method = Request Method(POST/GET/REQUEST/SERVER/PUT/PATCH/DELETE/AUTO) default AUTO
 * @return string empty string if no request variable registered 
 * 
 * @example see above 
 */
$HTTP_INPUT = []; // for save INPUT REQUEST 
function get_http_input(string $req_var, string $req_method="AUTO"){
  $req_method = strtoupper($req_method);
  if(count($HTTP_INPUT) === 0){
    parse_str(file_get_contents("php://input"), $data);
    $HTTP_INPUT = $data;
  }

  if($req_method === "AUTO"){
    $req_method = $_SERVER['REQUEST_METHOD'];
  }
  
  if($req_method === "GET"){
    return empty_if_unset($_GET, $req_var);
  }
  else if($req_method === "POST"){
    return empty_if_unset($_POST, $req_var);
  }
  else if($req_method === "REQUEST"){
    return empty_if_unset($_REQUEST, $req_var);
  }
  else if($req_method === "SERVER" || $req_method === "HEADER"){
    $req_var = strtoupper($req_var);
    $req_var = str_replace("-","_", $req_var);
    return empty_if_unset($_SERVER, "HTTP_".$req_var);
  }
  else if($req_method === "PUT" || $req_method === "PATCH" || $req_method === "DELETE"){
    return empty_if_unset($HTTP_INPUT, $req_var);
  }
}