Example how to DONT code

shit-code.php

<?php

/**
 * class bbablabla ....
 * ...
 * ..
 * 
 */
public function init(
        $arg_user_id,
        $arg_client_id
    ) {
        $return = array();

        if(
            empty($arg_user_id) ||
            empty($arg_client_id)
        ){
            //Error Block: invalid input to delete client
            include_once CORE_PATH . '/Debug/Error.php';
            $error = Error::init(200005);
            $return['errors'][] = $error;

            return $return;
        }

        //update client info
        include_once DAL_MYSQLI_PATH . '/Clients/DeleteClientDal.php';
        $objDeleteClientDal = new DeleteClientDal();
        $deleted = $objDeleteClientDal->delete(
            $arg_user_id,
            $arg_client_id
        );

        if(!$deleted){
            //Error Block: Failed to delete user's client
            include_once CORE_PATH . '/Debug/Error.php';
            $error = Error::init(200006);
            $return['errors'][] = $error;

            return $return;
        }

        $return['clients'] = array();

        return $return;
    }