psalm/src/Psalm/Output/Checkstyle.php

<?php
namespace Psalm\Output;

use LSS\Array2XML;
use Psalm\Output;

class Checkstyle extends Output
{
    /**
     * {{@inheritdoc}}
     */
    public function create(): string
    {
        $output = '<?xml version="1.0" encoding="UTF-8"?>' . "\n";

        $output .= '<checkstyle>' . "\n";

        foreach ($this->issues_data as $issue_data) {
            $message = sprintf(
                '%s: %s',
                $issue_data['type'],
                $issue_data['message']
            );

            $output .= '<file name="' . $issue_data['file_name'] . '">' . "\n";
            $output .= ' ';
            $output .= '<error';
            $output .= ' line="' . $issue_data['line_from'] . '"';
            $output .= ' column="' . $issue_data['column_from'] . '"';
            $output .= ' severity="' . $issue_data['severity'] . '"';
            $output .= ' message="' . $message . '"';
            $output .= '/>' . "\n";
            $output .= '</file>' . "\n";
        }

        $output .= '</checkstyle>' . "\n";

        return $output;
    }
}