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<?php

namespace PHPUnit\TestFixture;

use function set_error_handler;
use function trigger_error;
use PHPUnit\Framework\TestCase;

class SomeExternalDependency {
    public function __construct()
    {
        set_error_handler([$this, 'logError']);
        
        $this->triggerError();
    }
    
    public static function triggerError(): void
    {
        trigger_error('error', E_USER_WARNING);
    }

    private function logError(): bool
    {
        debug_print_backtrace();
        
        return true;
    }
}

class Issue5844Test
{

    public function testSetErrorHandlerNonCallable(): void
    {
        new SomeExternalDependency();
        $callableWithPrivateMethod = set_error_handler(static fn () => false);
        restore_error_handler();
        restore_error_handler();
        set_error_handler($callableWithPrivateMethod);
        
        echo "\nii.\n";
        SomeExternalDependency::triggerError();

        echo "\niii.\n";
        trigger_error('error', E_USER_WARNING);

        // $this->assertTrue(true);
    }
}

(new Issue5844Test())->testSetErrorHandlerNonCallable();

Output for git.master, git.master_jit, rfc.property-hooks: #0 [internal function]: PHPUnit\TestFixture\SomeExternalDependency->logError(512, 'error', '/in/GFd18', 19) #1 /in/GFd18(19): trigger_error('error', 512) #2 /in/GFd18(14): PHPUnit\TestFixture\SomeExternalDependency::triggerError() #3 /in/GFd18(35): PHPUnit\TestFixture\SomeExternalDependency->__construct() #4 /in/GFd18(51): PHPUnit\TestFixture\Issue5844Test->testSetErrorHandlerNonCallable() Fatal error: Uncaught TypeError: set_error_handler(): Argument #1 ($callback) must be a valid callback or null, cannot access private method PHPUnit\TestFixture\SomeExternalDependency::logError() in /in/GFd18:39 Stack trace: #0 /in/GFd18(39): set_error_handler(Array) #1 /in/GFd18(51): PHPUnit\TestFixture\Issue5844Test->testSetErrorHandlerNonCallable() #2 {main} thrown in /in/GFd18 on line 39
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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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
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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
2013-09-22 Anonymous classes - included in PHP 7

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