运行时类的PHP中的新动态实例

Question

I have different classes in which I have different properties. Now I want to instantiate these classes at runtime. Please have a look on my Example. Thank you for your help.

   class costumers
{
     $ Name;
...
}

class users
{
   $ Username;
...
}


class db_helper{
...
public function select (object $table, $columns, $limit, $offset) {
     // Instance the object like
      $out = new typeof ($table);
}

}

Answer 1

Perhaps you may want to take a look at this commented Code. It may give you some hints....

<?php

    class costumers {
        protected $Name;
        //...
    }

    class users {
        protected $Username;
        //...
    }


    class db_helper {
        //...
        // NOTICE THAT THERE IS NO TYPE-HINT HERE...
        // BAD PRACTICE! BUT THIS IS TO DEMONSTRATE 
        // THE POSSIBILITIES AVAILABLE TO YOU IN THIS CASE...
        public function select($table, $columns, $limit, $offset) {
            // INITIALIZE $out TO NULL TILL YOU KNOW MORE...
            $out    = null;
            if(is_object($table)){
                // IF $table IS AN OBJECT....
                // JUST START USING IT WITHOUT INSTANTIATION:
                $out = $table;
            }else{
                if(class_exists($table)){
                    // Instance the object like
                    $out = new $table;

                }
            }
        }
        // START USING THE OBJECT: $out
    }