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@ 2019-07-19T15:58:18Z

<?php

// An example callback function
function my_callback_function() {
    echo 'hello world!', PHP_EOL;
}

// Callback methods in classes
class ParentClass {
    static function myCallbackMethod() {
        echo 'Hello Parent!', PHP_EOL;
    }
}

class MyClass extends ParentClass {
    static function myCallbackMethod() {
        echo 'Hello Child!', PHP_EOL;
    }
}

class Invokable {
    public function __invoke() {
        echo 'Hello Invokable', PHP_EOL;
    }
}

$obj       = new MyClass();
$invokable = new Invokable();

$callbacks = array(
    'type1' => 'my_callback_function',
    'type2' => array('MyClass', 'myCallbackMethod'),
    'type3' => array($obj, 'myCallbackMethod'),
    'type6' => $invokable,
    'type7' => function() { echo 'Hello Closure', PHP_EOL; },
    'type4' => 'MyClass::myCallbackMethod',
    'type5' => array('MyClass', 'parent::myCallbackMethod'),
);

foreach( $callbacks as $key => $callback ) {
    echo PHP_EOL, 'Testing ', $key, PHP_EOL;
    var_dump(is_callable($callback));
    call_user_func($callback);
    try {
        $callback();
    } catch( Error $e ) {
        echo $e->getMessage(), PHP_EOL;
    }
}

Output for git.master, git.master_jit, rfc.property-hooks: Testing type1 bool(true) hello world! hello world! Testing type2 bool(true) Hello Child! Hello Child! Testing type3 bool(true) Hello Child! Hello Child! Testing type6 bool(true) Hello Invokable Hello Invokable Testing type7 bool(true) Hello Closure Hello Closure Testing type4 bool(true) Hello Child! Hello Child! Testing type5 Deprecated: Callables of the form ["MyClass", "parent::myCallbackMethod"] are deprecated in /in/C28tc on line 42 bool(true) Deprecated: Callables of the form ["MyClass", "parent::myCallbackMethod"] are deprecated in /in/C28tc on line 43 Hello Parent! Call to undefined method MyClass::parent::myCallbackMethod()

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2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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