Online PHP editor | rfc for jo1IG

@ 2013-01-11T14:25:36Z

<?php

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

    return function() use ($fn, $wrapper) {
        $gen = $wrapper();

        // Only call the wrapped function if the decorator made "yield"
        if (!$gen instanceof \Generator) {
            return $gen;
        }

        // Use the yielded arguments, forward all if none given.
        if (is_array($gen->current())) {
            $arguments = $gen->current();
        } else {
            $arguments = func_get_args();
        }

        // Forward all throwed Exceptions
        try {
            // Send the decorated function's return value into the
            // decorator as return value of "yield"
        	$gen->send(call_user_func_array($fn, $arguments));
        } catch (\Exception $e) {
            $gen->throw($e);
        }
    };
}

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

function catch_all_exceptions()
{
    return function() {
        try {
            (yield);
        } catch (\Exception $e) {
            echo "catch_all_exceptions: Caught Exception: $e\n";
        }
    };
}

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

        if ($called) {
            return $return;
        } else {
            $return = (yield);
            $called = true;
        }
    };
}

function do_something_before()
{
    return function() {
        echo "Before!\n";
        yield;
    };
}

$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 Hello Before! catch_all_exceptions: Caught Exception: Exception: Error bar! in /in/jo1IG:35 Stack trace: #0 /in/jo1IG(26): foo('bar') #1 /in/jo1IG(26): {closure}('bar') #2 /in/jo1IG(76): {closure}('bar') #3 {main} NULL

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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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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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