A custom runner for PHP_CodeSniffer to process a single piece of content

CustomPHPCSRunner.php

<?php
namespace MyCustomProject;

use PHP_CodeSniffer\Runner;
use PHP_CodeSniffer\Config;
use PHP_CodeSniffer\Reporter;
use PHP_CodeSniffer\Files\DummyFile;
use PHP_CodeSniffer\Util\Timing;

// Include the PHPCS autoloader however you need.
require_once __DIR__.'/autoload.php';

// If you don't want timing information in the report, remove this.
Timing::startTiming();

// Create and populate the runner using a fixed standard.
$runner = new Runner();
$runner->config = new Config();
$runner->config->standards = array('PSR2');
$runner->init();

// Hard-code some other config settings.
// Do this after init() so these values override anything that was set in
// the rulesets we processed during init(). Or do this before if you want
// to use them like defaults instead.
$runner->config->reports      = array('summary' => null, 'full' => null);
$runner->config->verbosity    = 0;
$runner->config->showProgress = false;
$runner->config->interactive  = false;
$runner->config->cache        = false;
$runner->config->showSources  = true;

// Create the reporter, using the hard-coded settings from above.
$runner->reporter = new Reporter($runner->config);

// Create and process a single file, faking the path so the report looks nice.
$fileContent = "<?php\necho 'hi';";
$file = new DummyFile($fileContent, $runner->ruleset, $runner->config);
$file->path = '/path/to/my/file.php';

// Process the file.
$runner->processFile($file);

// Print out the reports.
$runner->reporter->printReports();

The output for this file looks like this:

$ php CustomPHPCSRunner.php

PHP CODE SNIFFER REPORT SUMMARY
----------------------------------------------------------------------
FILE                                                  ERRORS  WARNINGS
----------------------------------------------------------------------
/path/to/my/file.php                                  1       0
----------------------------------------------------------------------
A TOTAL OF 1 ERROR AND 0 WARNINGS WERE FOUND IN 1 FILE
----------------------------------------------------------------------
PHPCBF CAN FIX 1 OF THESE SNIFF VIOLATIONS AUTOMATICALLY
----------------------------------------------------------------------

Time: 62ms; Memory: 5Mb


FILE: /path/to/my/file.php
--------------------------------------------------------------------------------------------------
FOUND 1 ERROR AFFECTING 1 LINE
--------------------------------------------------------------------------------------------------
 2 | ERROR | [x] Expected 1 newline at end of file; 0 found (PSR2.Files.EndFileNewline.NoneFound)
--------------------------------------------------------------------------------------------------
PHPCBF CAN FIX THE 1 MARKED SNIFF VIOLATIONS AUTOMATICALLY
--------------------------------------------------------------------------------------------------