Online PHP editor | rfc for Ae3mI

@ 2017-06-29T23:00:26Z

<?php

function new_array(...$args) {
	return $args;
}

function fukin_eval($op, ...$args) {
	switch ($op) {
		case 'MUL':
			return fukin_eval(...multiply(...$args));
		case 'DIV':
			return fukin_eval(...divide(...$args));
		case 'INV':
		    $params = $args[2] ?? [];
			return fukin_eval($args[0]->{$args[1]}(...$params));
		default:
			return new_array($op, ...$args);
	}
}

function multiply(...$vals) {
	if (count($vals) === 0) {
		return ['RAT', 1, 1];
	}

	$car = fukin_eval(...array_pop($vals));

	if ($car[0] === 'ERR') {
		return $car;
	}

	if ($car[1] === 0) {
	    ['RAT', 0, 1];
	}

	$cdr = fukin_eval(...multiply(...$vals));

	if ($cdr[0] === 'ERR') {
		return $car;
	}

	if ($cdr[1] === 0) {
	    ['RAT', 0, 1];
	}

	return ['RAT', $car[1] * $cdr[1], $car[2] * $cdr[2]];
}

function divide(...$vals) {
	if (count($vals) === 0) {
		return ['RAT', 1, 1];
	}

	$car = fukin_eval(...array_pop($vals));
	
	if ($car[0] === 'ERR') {
		return $car;
	}

	if ($car[1] === 0) {
	    return ['ERR', 'DIVISION BY ZERO'];
	}

	$cdr = fukin_eval(...divide(...$vals));
	
	if ($cdr[0] === 'ERR') {
		return $car;
	}

	if ($cdr[2] === 0) {
	    return ['ERR', 'DIVISION BY ZERO'];
	}

	return ['RAT', $car[2] * $cdr[1], $car[1] * $cdr[2]];
}

var_dump(fukin_eval('MUL', ['RAT', 1, 1], ['RAT', 2, 1], ['RAT', 3, 1]));

var_dump(fukin_eval('DIV', ['RAT', 1, 1], ['RAT', 0, 1]));

var_dump(fukin_eval('MUL', ['RAT', 0, 1], ['DIV', ['RAT', 1, 1], ['RAT', 0, 1]]));

var_dump(fukin_eval('MUL', ['DIV', ['RAT', 1, 1], ['RAT', 0, 1]], ['RAT', 0, 1]));




class Foo implements Countable {
	function __construct($val) {
		$this->val = $val;
	}
	function count() {
		return $this->val;
	}
}

$a = new Foo(3);

var_dump(fukin_eval('MUL', ['RAT', 2, 1], ['INV', $a, 'count']));

Output for git.master, git.master_jit, rfc.property-hooks: array(3) { [0]=> string(3) "RAT" [1]=> int(6) [2]=> int(1) } array(2) { [0]=> string(3) "ERR" [1]=> string(16) "DIVISION BY ZERO" } array(2) { [0]=> string(3) "ERR" [1]=> string(16) "DIVISION BY ZERO" } array(3) { [0]=> string(3) "RAT" [1]=> int(0) [2]=> int(1) } Deprecated: Return type of Foo::count() should either be compatible with Countable::count(): int, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /in/Ae3mI on line 92 Deprecated: Creation of dynamic property Foo::$val is deprecated in /in/Ae3mI on line 90 Warning: Undefined array key 1 in /in/Ae3mI on line 32 Warning: Undefined array key 1 in /in/Ae3mI on line 46 Warning: Undefined array key 2 in /in/Ae3mI on line 46 array(3) { [0]=> string(3) "RAT" [1]=> int(0) [2]=> int(0) }

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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
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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
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