How to dynamically create an anonymous class that extends an abstract class in PHP?

Question

Simply, let me explain by an example.

<?php
class My extends Thread {
    public function run() {
        /** ... **/
    }
}
$my = new My();
var_dump($my->start());
?>

This is from PHP manual.

I am wondering if there is a way to do this in more Java-like fashion. For example:

<?php
$my = new Thread(){
        public function run() {
            /** ... **/
        }
      };
var_dump($my->start());
?>

No, you can not act like this way (I suppose there are ways to do this with another syntax and/or constructions, but such way - not) — Alma Do, Aug 16 '13 at 14:14
Welcome to PHP. It does not support such behaviour. The only way to do it is the first way. — baldrs, Aug 16 '13 at 14:20

score 17 · Answer 1 · answered May 23 '17 at 21:49

17

I know this is an old post, but I'd like to point out that PHP7 has introduced anonymous classes.

It would look something like this:

$my = new class extends Thread
{
    public function run()
    {
        /** ... **/
    }
};

$my->start();

answered May 23 '17 at 21:49

Thomas Kelley

10,187
1
36
43

score 4 · Answer 2 · answered Sep 21 '15 at 10:42

4

Alternatively, you can use PHP7's Anonymous Classes capability as documented at http://php.net/manual/en/migration70.new-features.php#migration70.new-features.anonymous-classes and http://php.net/manual/en/language.oop5.anonymous.php

answered Sep 21 '15 at 10:42

Richard A Quadling

3,769
30
40

3

Starting with PHP7, this is correct ... source: I wrote anonymous class support, and pthreads ... – Joe Watkins Sep 27 '15 at 08:13

score 1 · Answer 3 · answered Sep 17 '15 at 15:10

You do have access ev(a|i)l. If you used traits to compose your class it COULD be possible to do this.

<?php
trait Constructor {
  public function __construct() {
    echo __METHOD__, PHP_EOL;
  }
}

trait Runner {
  public function run() {
    echo __METHOD__, PHP_EOL;
  }
}
trait Destructor {
  public function __destruct() {
    echo __METHOD__, PHP_EOL;
  }
}

$className = 'Thread';
$traits = ['Constructor','Destructor','Runner',];
$class = sprintf('class %s { use %s; }', $className, implode(', ', $traits));
eval($class);
$thread = new $className;
$thread->run();

This outputs ...

Constructor::__construct
Runner::run
Destructor::__destruct

So you CAN, but not sure if you SHOULD.

score 1 · Answer 4 · answered Oct 13 '15 at 15:20

1

Or you can just use namespaces.

<?php
namespace MyName\MyProject;
class Thread {
   public function run(){...}
}
?>


<?php
use MyName\MyProject;
$my = new Thread();

$my->run();

answered Oct 13 '15 at 15:20

Raul3k

141
5

How to dynamically create an anonymous class that extends an abstract class in PHP?

4 Answers4