OOP in PHP: Class-function from a variable?

Hello

Is it possible to call functions from class like this:

$class = new class;
$function_name = "do_the_thing";
$req = $class->$function_name();

Something similar solution, this doesn't seem to work?

Martti Laine

From stackoverflow

• Yes, it is possible, that is know as variable functions, have a look at this.

  Example from PHP's official site:

  <?php
  class Foo
  {
      function Variable()
      {
          $name = 'Bar';
          $this->$name(); // This calls the Bar() method
      }
  
      function Bar()
      {
          echo "This is Bar";
      }
  }
  
  $foo = new Foo();
  $funcname = "Variable";
  $foo->$funcname();  // This calls $foo->Variable()
  
  ?>
  

  In your case, make sure that the function do_the_thing exists. Also note that you are storing the return value of the function:

  $req = $class->$function_name();
  

  Try to see what the variable $req contains. For example this should give you info:

  print_r($req); // or simple echo as per return value of your function
  

  Note:

  Variable functions won't work with language constructs such as echo(), print(), unset(), isset(), empty(), include(), require() and the like. Utilize wrapper functions to make use of any of these constructs as variable functions.

  MAS1 : +1 for information given in Note.

  Sarfraz : @MAS1: Yeah it is very important :)

  Martti Laine : Thanks, a nice and detailed answer! :)

  Sarfraz : @Martti Laine: You are welcome :)