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@ 2015-08-28T13:31:32Z

<?php

function autoboxing_error_handler($errno, $errstr, $errfile, $errline, $errcontext) {
	if (preg_match('/^Argument (\d+) passed to \S+ must be (?:an|an instance of|of the type) (\S+), \S+ given/', $errstr, $match)) {
		$bt = debug_backtrace();
		$value = $bt[1]["args"][$match[1] - 1];
		if (strcasecmp($match[2], "array") == 0) {
			$bt[1]["args"][$match[1] - 1] = array($value);
			return true;
		} else if (is_subclass_of($match[2], "Autoboxable")) {
			$bt[1]["args"][$match[1] - 1] = new $match[2]($value);
			return true;
		}
	}
	return false;
}

set_error_handler("autoboxing_error_handler");

interface Autoboxable {

	public function __construct($value);

}

class Integer implements Autoboxable {

	public $value = null;

	public function __construct($value) {
		$this->value = (int)$value;
	}

}

function foo(Integer $a, array $b) {
	var_dump($a->value);
	var_dump($b);
}

foo("1", 2);

Output for git.master, git.master_jit, rfc.property-hooks: Fatal error: Uncaught TypeError: foo(): Argument #1 ($a) must be of type Integer, string given, called in /in/5lbf0 on line 41 and defined in /in/5lbf0:36 Stack trace: #0 /in/5lbf0(41): foo('1', 2) #1 {main} thrown in /in/5lbf0 on line 36
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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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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