Online PHP editor | output for 3nIOH

@ 2022-01-17T13:38:15Z

<?php

class Action
{
    /** @var \Iterator */
    public $generator;

    public function __construct(array $data)
    {
        $this->generator = new \ArrayIterator($data);
        $this->generator->x = $this; // circular ref (can be any custom iterator)
        
        echo '-- c ' . spl_object_id($this) . "\n";
    }

    public function __destruct()
    {
        echo '-- d ' . spl_object_id($this) . "\n";
    }

    /**
     * @return $this
     */
    public function filter()
    {
        $filterFx = function ($row) {
            return $row !== $this; // always true, dummy use $this
        };
        $this->generator = new \CallbackFilterIterator($this->generator, $filterFx);
        $this->generator->rewind();

        return $this;
    }

    /**
     * @return $this
     */
    public function limit(int $limit = null, int $offset = 0)
    {
        $this->generator = new \LimitIterator($this->generator, $offset, $limit ?? -1);
        $this->generator->rewind();

        return $this;
    }
}

$action = new Action(['a', 'b']);
print_r(iterator_to_array($action->generator));
$action = null; gc_collect_cycles();

$action = new Action(['a', 'b']);
$action->filter();
print_r(iterator_to_array($action->generator));
$action = null; gc_collect_cycles();

$action = new Action(['a', 'b']);
$action->filter()->limit(1);
print_r(iterator_to_array($action->generator));
$action = null; gc_collect_cycles();

echo '----------------' . "\n";

Output for 8.4.1 - 8.4.18, 8.5.0 - 8.5.3: Deprecated: Action::limit(): Implicitly marking parameter $limit as nullable is deprecated, the explicit nullable type must be used instead in /in/3nIOH on line 38 Deprecated: Creation of dynamic property ArrayIterator::$x is deprecated in /in/3nIOH on line 11 -- c 1 Array ( [0] => a [1] => b ) -- d 1 Deprecated: Creation of dynamic property ArrayIterator::$x is deprecated in /in/3nIOH on line 11 -- c 1 Array ( [0] => a [1] => b ) -- d 1 Deprecated: Creation of dynamic property ArrayIterator::$x is deprecated in /in/3nIOH on line 11 -- c 1 Array ( [0] => a ) -- d 1 ----------------
Output for 8.2.0 - 8.2.30, 8.3.0 - 8.3.30: Deprecated: Creation of dynamic property ArrayIterator::$x is deprecated in /in/3nIOH on line 11 -- c 1 Array ( [0] => a [1] => b ) -- d 1 Deprecated: Creation of dynamic property ArrayIterator::$x is deprecated in /in/3nIOH on line 11 -- c 1 Array ( [0] => a [1] => b ) -- d 1 Deprecated: Creation of dynamic property ArrayIterator::$x is deprecated in /in/3nIOH on line 11 -- c 1 Array ( [0] => a ) -- d 1 ----------------
Output for 8.1.4 - 8.1.34: -- c 1 Array ( [0] => a [1] => b ) -- d 1 -- c 1 Array ( [0] => a [1] => b ) -- d 1 -- c 1 Array ( [0] => a ) -- d 1 ----------------
Output for 8.1.0 - 8.1.3: -- c 1 Array ( [0] => a [1] => b ) -- d 1 -- c 1 Array ( [0] => a [1] => b ) -- d 1 -- c 1 Array ( [0] => a ) ---------------- -- d 1
Output for 7.4.0 - 7.4.33, 8.0.1 - 8.0.30: -- c 1 Array ( [0] => a [1] => b ) -- d 1 -- c 3 Array ( [0] => a [1] => b ) -- c 1 Array ( [0] => a ) ---------------- -- d 1 -- d 3

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