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Editing: PageBox.php

<?php

namespace Mpdf;

class PageBox implements \ArrayAccess
{

private $container = [];

public function __construct()
	{
		$this->container = [
			'current' => null,
			'outer_width_LR' => null,
			'outer_width_TB' => null,
			'using' => null,
		];
	}

#[\ReturnTypeWillChange]
	public function offsetSet($offset, $value)
	{
		if (!$this->offsetExists($offset)) {
			throw new \Mpdf\MpdfException('Invalid key to set for PageBox');
		}

$this->container[$offset] = $value;
	}

#[\ReturnTypeWillChange]
	public function offsetExists($offset)
	{
		return array_key_exists($offset, $this->container);
	}

#[\ReturnTypeWillChange]
	public function offsetUnset($offset)
	{
		if (!$this->offsetExists($offset)) {
			throw new \Mpdf\MpdfException('Invalid key to set for PageBox');
		}

$this->container[$offset] = null;
	}

#[\ReturnTypeWillChange]
	public function offsetGet($offset)
	{
		if (!$this->offsetExists($offset)) {
			throw new \Mpdf\MpdfException('Invalid key to set for PageBox');
		}

return $this->container[$offset];
	}

}

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