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@ 2023-10-11T10:34:37Z

<?php

class Database {}

$fns = [
    function ($str) {},
    function ($str ="hello") {},
    function (string $str) {},
    function (string $str = null) {},
    function (?string $str) {},
    function (?Database $db) {},
    function (Database $db = new Database()) {},
    function (string|null $str) {},
    function (string $str = "hello") {},
    function (?string $str = "hello") {},
    function (string|int $str) {},
    function (string|null $str = null) {},
    function (string|null $str = "hello") {},
];

echo "parameter\tallowsNull\tisOptional\tgetDefaultValue\tgetType\n";

foreach ($fns as $fn) {
    $param = (new ReflectionFunction($fn))->getParameters()[0];
    
    echo substr($param->__toString(), 26, -2)
        . "\t" . json_encode($param->allowsNull())
        . "\t" . json_encode($param->isOptional())
        . "\t" . ($param->isDefaultValueAvailable() ? str_replace("\n", "", print_r($param->getDefaultValue(), true)) : "throws ReflectionException")
        . "\t" . ($param->getType() ? get_class($param->getType()) : "null")
        . "\n";
}

Output for git.master_jit, git.master: Deprecated: {closure:/in/pnXfM:9}(): Implicitly marking parameter $str as nullable is deprecated, the explicit nullable type must be used instead in /in/pnXfM on line 9 parameter allowsNull isOptional getDefaultValue getType $str true false throws ReflectionException null $str = 'hello' true true hello null string $str false false throws ReflectionException ReflectionNamedType ?string $str = NULL true true ReflectionNamedType ?string $str true false throws ReflectionException ReflectionNamedType ?Database $db true false throws ReflectionException ReflectionNamedType Database $db = new \Database() false true Database Object() ReflectionNamedType ?string $str true false throws ReflectionException ReflectionNamedType string $str = 'hello' false true hello ReflectionNamedType ?string $str = 'hello' true true hello ReflectionNamedType string|int $str false false throws ReflectionException ReflectionUnionType ?string $str = NULL true true ReflectionNamedType ?string $str = 'hello' true true hello ReflectionNamedType

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2022-12-01 RFC: Property hooks - included in PHP 8.4
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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