Online PHP editor | output for sXXe8

@ 2026-01-30T12:31:14Z

<?php

const SOMECONST = 'Const hello';

enum SomeEnum 
{
    case Hearts;
    case Diamonds;
    case Clubs;
    case Spades;
}

function SomeFunction()
{
}

$SomeFunctionClosure = function()
{
};

$SomeFunctionFirstClassCallable = SomeFunction(...);

$someFunctionClosureFromCallabe = Closure::fromCallable('SomeFunction');

class ShouldTypeError
{
    public function __construct($returnValue)
    {
        if ($returnValue !== 'no-return') {
            if ($returnValue === '$this') {
                return $this;
            } elseif ($returnValue === 'no-return-value') {
                return;
            } elseif ($returnValue === 'void') {
                return void;
            } elseif ($returnValue === 'never') {
                return never;
            }
            
            return $returnValue;
        }
    }
}

$testcases = [
    'no-return',
    'no-return-value',
    '$this',
    new ShouldTypeError('no-return'),

    SOMECONST,    
    'abc',
    1,
    1.23,
    null,
    true,
    false,
    
    ['a', 'b', 'c'],
    ['a' => 'a', 'b' => 'b', 'c' => 'c', 0 => 'Zero'],
    
    'never',
    'void',
    
    SomeEnum::Spades,
    
    function() {
       echo 'Hi'.PHP_EOL;
    },
    $SomeFunctionClosure,
    $SomeFunctionFirstClassCallable,
    $someFunctionClosureFromCallabe,
    
    new DateTimeImmutable(),
];

foreach($testcases as $testcase) {
    echo "--------------[ TESTCASE ]--------------\n";
    var_dump($testcase);
    echo "\n";
    
    try {
        $didReturn = new ShouldTypeError($testcase);
        
        switch($testcase) {
            case 'no-return':
                echo "Success: without a return statement is always valid.\n";
                break;

            case 'no-return-value':
                echo "Success: a return statement without a value is always valid.\n";
                break;

            case '$this':
                echo "Dubious: return $this is dubious.\n";
                echo "- it fullfills the return type, so it could be allowed.\n";
                echo "- but returning anything from a constructor is nonsense, because it is discarded.\n";
                echo "  As shown by the third testcase new SomeTypeError('no-return').\n";
                break;
                
            default:
                echo "Error: why is it not a return TypeError?\n";
                break;
        }
        
        if (!($didReturn instanceof ShouldTypeError)) {
            echo "Failed to new a ShouldTypeError.\n";
        }
    } catch (Throwable $ex) {
        echo "Success: throwable: ".$ex->getMessage()."\n";
    }
}

Output for 8.5.2: --------------[ TESTCASE ]-------------- string(9) "no-return" Success: without a return statement is always valid. --------------[ TESTCASE ]-------------- string(15) "no-return-value" Success: a return statement without a value is always valid. --------------[ TESTCASE ]-------------- string(5) "$this" Success: throwable: Using $this when not in object context --------------[ TESTCASE ]-------------- object(ShouldTypeError)#4 (0) { } Error: why is it not a return TypeError? --------------[ TESTCASE ]-------------- string(11) "Const hello" Error: why is it not a return TypeError? --------------[ TESTCASE ]-------------- string(3) "abc" Error: why is it not a return TypeError? --------------[ TESTCASE ]-------------- int(1) Error: why is it not a return TypeError? --------------[ TESTCASE ]-------------- float(1.23) Error: why is it not a return TypeError? --------------[ TESTCASE ]-------------- NULL Error: why is it not a return TypeError? --------------[ TESTCASE ]-------------- bool(true) Success: without a return statement is always valid. --------------[ TESTCASE ]-------------- bool(false) Error: why is it not a return TypeError? --------------[ TESTCASE ]-------------- array(3) { [0]=> string(1) "a" [1]=> string(1) "b" [2]=> string(1) "c" } Error: why is it not a return TypeError? --------------[ TESTCASE ]-------------- array(4) { ["a"]=> string(1) "a" ["b"]=> string(1) "b" ["c"]=> string(1) "c" [0]=> string(4) "Zero" } Error: why is it not a return TypeError? --------------[ TESTCASE ]-------------- string(5) "never" Success: throwable: Undefined constant "never" --------------[ TESTCASE ]-------------- string(4) "void" Success: throwable: Undefined constant "void" --------------[ TESTCASE ]-------------- enum(SomeEnum::Spades) Error: why is it not a return TypeError? --------------[ TESTCASE ]-------------- object(Closure)#6 (3) { ["name"]=> string(22) "{closure:/in/sXXe8:67}" ["file"]=> string(9) "/in/sXXe8" ["line"]=> int(67) } Error: why is it not a return TypeError? --------------[ TESTCASE ]-------------- object(Closure)#1 (3) { ["name"]=> string(22) "{closure:/in/sXXe8:17}" ["file"]=> string(9) "/in/sXXe8" ["line"]=> int(17) } Error: why is it not a return TypeError? --------------[ TESTCASE ]-------------- object(Closure)#2 (1) { ["function"]=> string(12) "SomeFunction" } Error: why is it not a return TypeError? --------------[ TESTCASE ]-------------- object(Closure)#3 (1) { ["function"]=> string(12) "SomeFunction" } Error: why is it not a return TypeError? --------------[ TESTCASE ]-------------- object(DateTimeImmutable)#7 (3) { ["date"]=> string(26) "2026-01-30 13:31:14.025598" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" } Error: why is it not a return TypeError?

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