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<?php
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
const CONSTANT_INT = 1000;
$y = 5;
$fn0 = fn() => 100;
$fn1a = fn(int $x) => $x + $y;
$fn1b = function ($x) use ($y) {
return $x + $y;
};
$fn2 = fn(int $a, ArrowFunctions $b) => $a + $b->getNumber() * $y;
fn (array $x) => $x; // parameter type
fn(int $x): int => $x; // return type
fn(?array $z, int $x): ?int => $x + count($z); // parameter and return type
fn($x = 100) => $x; // default value
fn(&$x) => $x; // reference
fn&($x) => $x; // reference
fn&(&$x) => $x; // reference
fn($x, ...$reset) => $reset; // variadics
fn($x, &...$reset) => $reset; // reference variadics
fn(): int => CONSTANT_INT;
fn(): ArrowFunctions => ArrowFunctions::new();
function (): ArrowFunctions {
return ArrowFunctions::new();
};
// nest
$af = fn() => fn() => $y;
(fn() => fn() => $y)()();
(fn() => function() use ($y) {return $y;})()();
$af = fn(int $x): callable => fn(int $z): int => $x + $y * $z;
$af = fn(ArrowFunctions $x): callable => fn(?ArrowFunctions $z): ?ArrowFunctions => new ArrowFunctions();
$fn3 = function ($x) use ($y) {
return fn() => $x + $y;
};
$fn4 = function ($x) use ($y) {
return fn($x) => $x + $y;
};
function test(callable $f) {
return fn(...$args) => !$f(...$args);
}
class ArrowFunctions
{
public function test() {
$y = 100;
$af = fn(): ?ArrowFunctions => $this;
$af = fn() => $$variable;
$af = fn() => self::class;
$af = fn($x): ?int => $x + $y;
$af = static fn() => isset($this); // static
}
public function getNumber(): int {
return 100;
}
public static function new() {
return new ArrowFunctions();
}
}
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