Symfony\Component\Debug\Exception\FlattenException::getAllPrevious PHP Method

    public function getAllPrevious()
    {
        $exceptions = array();
        $e = $this;
        while ($e = $e->getPrevious()) {
            $exceptions[] = $e;
        }

        return $exceptions;
    }

    /**
     * Gets the HTML content associated with the given exception.
     *
     * @param FlattenException $exception A FlattenException instance
     *
     * @return string The content as a string
     */
    public function getContent(FlattenException $exception)
    {
        switch ($exception->getStatusCode()) {
            case 404:
                $title = 'Sorry, the page you are looking for could not be found.';
                break;
            default:
                $title = 'Whoops, looks like something went wrong.';
        }
        $content = '';
        if ($this->debug) {
            try {
                $count = count($exception->getAllPrevious());
                $total = $count + 1;
                foreach ($exception->toArray() as $position => $e) {
                    $ind = $count - $position + 1;
                    $class = $this->formatClass($e['class']);
                    $message = nl2br($this->escapeHtml($e['message']));
                    $content .= sprintf(<<<EOF
                        <h2 class="block_exception clear_fix">
                            <span class="exception_counter">%d/%d</span>
                            <span class="exception_title">%s%s:</span>
                            <span class="exception_message">%s</span>
                        </h2>
                        <div class="block">
                            <ol class="traces list_exception">

EOF
, $ind, $total, $class, $this->formatPath($e['trace'][0]['file'], $e['trace'][0]['line']), $message);
                    foreach ($e['trace'] as $trace) {
                        $content .= '       <li>';
                        if ($trace['function']) {
                            $content .= sprintf('at %s%s%s(%s)', $this->formatClass($trace['class']), $trace['type'], $trace['function'], $this->formatArgs($trace['args']));
                        }
                        if (isset($trace['file']) && isset($trace['line'])) {
                            $content .= $this->formatPath($trace['file'], $trace['line']);
                        }
                        $content .= "</li>\n";
                    }
                    $content .= "    </ol>\n</div>\n";
                }
            } catch (\Exception $e) {
                // something nasty happened and we cannot throw an exception anymore
                if ($this->debug) {
                    $title = sprintf('Exception thrown when handling an exception (%s: %s)', get_class($e), $this->escapeHtml($e->getMessage()));
                } else {
                    $title = 'Whoops, looks like something went wrong.';
                }
            }
        }
        return <<<EOF
            <div id="sf-resetcontent" class="sf-reset">
                <h1>{$title}</h1>
                {$content}
            </div>
EOF;
    }