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@ 2013-01-11T14:30:21Z

<?php

function decorate(callable $fn, callable $decorator)
{
	$wrapper = $decorator($fn);

    return function() use ($wrapper) {
        $returnValue = $wrapper();
        return $returnValue;
    };
}

function foo($bar)
{
    throw new Exception("Error $bar!");
}

function catch_all_exceptions(callable $fn)
{
    return function() use ($fn) {
        try {
            return call_user_func_array($fn, func_get_args());
        } catch (\Exception $e) {
            echo "catch_all_exceptions: Caught Exception: $e\n";
        }
    };
}

function once(callable $fn) {
    return function() use ($fn) {
        static $return;
        static $called = false;

        if (!$called) {
            $return = call_user_func_array($fn, func_get_args());
            $called = true;
        }

        return $return;
    };
}

function do_something_before(callable $fn)
{
    return function() use ($fn) {
        echo "Before!\n";
        call_user_func_array($fn, func_get_args());
    };
}

$bar = decorate(function() { echo "Hello\n"; }, "once");
$bar();
$bar();

$foo = decorate(decorate("foo", "catch_all_exceptions"), "do_something_before");
var_dump($foo("bar"));

Output for git.master, git.master_jit, rfc.property-hooks: Hello Before! Fatal error: Uncaught ArgumentCountError: Too few arguments to function foo(), 0 passed in /in/tIGFu on line 22 and exactly 1 expected in /in/tIGFu:13 Stack trace: #0 /in/tIGFu(22): foo() #1 /in/tIGFu(8): {closure}() #2 /in/tIGFu(47): {closure}() #3 /in/tIGFu(8): {closure}() #4 /in/tIGFu(56): {closure}('bar') #5 {main} thrown in /in/tIGFu on line 13
Process exited with code 255.

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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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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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