vendor/filp/whoops/src/Whoops/Handler/XmlResponseHandler.php

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<?php
/**
 * Whoops - php errors for cool kids
 * @author Filipe Dobreira <http://github.com/filp>
 */

namespace Whoops\Handler;

use SimpleXMLElement;
use Whoops\Exception\Formatter;

/**
 * Catches an exception and converts it to an XML
 * response. Additionally can also return exception
 * frames for consumption by an API.
 */
class XmlResponseHandler extends Handler
{
    /**
     * @var bool
     */
    private $returnFrames = false;

    /**
     * @param  bool|null  $returnFrames
     * @return bool|static
     */
    public function addTraceToOutput($returnFrames = null)
    {
        if (func_num_args() == 0) {
            return $this->returnFrames;
        }

        $this->returnFrames = (bool) $returnFrames;
        return $this;
    }

    /**
     * @return int
     */
    public function handle()
    {
        $response = [
            'error' => Formatter::formatExceptionAsDataArray(
                $this->getInspector(),
                $this->addTraceToOutput()
            ),
        ];

        echo self::toXml($response);

        return Handler::QUIT;
    }

    /**
     * @return string
     */
    public function contentType()
    {
        return 'application/xml';