Online PHP editor | output for HWETd

@ 2018-10-02T15:08:44Z

<?php

class Foo
{
    public $dummy1;
    public $dummy2;
}

class ErrorHandler
{
    private $private = 'THIS IS PRIVATE'."\n";

    function __construct()
    {
        set_error_handler(
            function ($errno, $errstr, $errfile, $errline) {
                $this->handleError($errno, $errstr, $errfile, $errline);
            }
        );
    }

    private function handleError($errno, $errstr, $errfile, $errline, $errmodule = null)
    {
        echo __METHOD__. " dealing with error $errstr, $errfile:$errline\n";

        // This attribute is no longer accessible in this object.  Same for other
        // objects and their private attributes once we reach in this state.
        echo $this->private;

        echo "Never executed in PHP7.2; there is a fatal error in the line above\n";
    }
}

function reproduceBug(Foo $f)
{
	unset($f->dummy2);

    foreach ((new ReflectionObject($f))->getProperties() as $p)
        echo $p->getName() .' = '. $p->getValue($f) ."\n";

    echo "This line is not reached in PHP7.2; but it is reached in PHP 7.0\n";
}

$errorHandler = new ErrorHandler();

echo $x; # uncommenting this fixes it

reproduceBug(new Foo);

Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.27, 8.4.1 - 8.4.14: ErrorHandler::handleError dealing with error Undefined variable $x, /in/HWETd:46 THIS IS PRIVATE Never executed in PHP7.2; there is a fatal error in the line above dummy1 = ErrorHandler::handleError dealing with error Undefined property: Foo::$dummy2, /in/HWETd:39 THIS IS PRIVATE Never executed in PHP7.2; there is a fatal error in the line above dummy2 = This line is not reached in PHP7.2; but it is reached in PHP 7.0
Output for 7.0.7 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33: ErrorHandler::handleError dealing with error Undefined variable: x, /in/HWETd:46 THIS IS PRIVATE Never executed in PHP7.2; there is a fatal error in the line above dummy1 = ErrorHandler::handleError dealing with error Undefined property: Foo::$dummy2, /in/HWETd:39 THIS IS PRIVATE Never executed in PHP7.2; there is a fatal error in the line above dummy2 = This line is not reached in PHP7.2; but it is reached in PHP 7.0
Output for 5.6.0 - 5.6.40, 7.0.0 - 7.0.6: ErrorHandler::handleError dealing with error Undefined variable: x, /in/HWETd:46 THIS IS PRIVATE Never executed in PHP7.2; there is a fatal error in the line above dummy1 = dummy2 = This line is not reached in PHP7.2; but it is reached in PHP 7.0

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