php-src/Zend/tests/bug40833.phpt

--TEST--
Bug #40833 (Crash when using unset() on an ArrayAccess object retrieved via __get)
--FILE--
<?php
    class entity
    {
        private $data;
        private $modified;

        function __get($name)
        {
            if ( isset($this->data[$name]) )
                return $this->data[$name];
            else
                return $this->data[$name] = new set($this);
        }

        function __set($name, $value)
        {
            $this->modified[$name] = $value;
        }
    }

    class set implements ArrayAccess
    {
        private $entity;

        function __construct($entity)
        {
            $this->entity = $entity;
            $this->entity->whatever = $this;
        }

        function clear() {
            $this->entity->whatever = null;
        }

        function offsetUnset($offset): void
        {
            $this->clear();
//			$this->entity->{$this->name} = null;
        }

        function offsetSet($offset, $value): void
        {
        }

        function offsetGet($offset): mixed
        {
            return 'Bogus ';
        }

        function offsetExists($offset): bool
        {
        }
    }

    $entity = new entity();
    echo($entity->whatever[0]);

    //This will crash
//	$entity->whatever->clear();
    unset($entity->whatever[0]);

    //This will not crash (comment previous & uncomment this to test
//	$test = $entity->whatever; unset($test[0]);

    echo($entity->whatever[0]);
    echo "ok\n";
?>
--EXPECT--
Bogus Bogus ok