This is a file named pre-commit that we use in our repo's ~/.git/hooks to check our php code

pre-commit.php

#!/usr/bin/env php
<?php

// Credit: https://carlosbuenosvinos.com/write-your-git-hooks-in-php-and-keep-them-under-git-control/

require __DIR__ . '/../../vendor/autoload.php';

use Symfony\Component\Console\Input\InputInterface;
use Symfony\Component\Console\Output\OutputInterface;
use Symfony\Component\Process\Process;
use Symfony\Component\Console\Application;

class CodeQualityTool extends Application
{
    private $output;
    private $input;

    const PHP_FILES_IN_SRC = '/^src\/(.*)(\.php)$/';
    const PHP_FILES_IN_CLASSES = '/^classes\/(.*)(\.php)$/';

    public function __construct()
    {
        parent::__construct('Code Quality Tool', '1.0.0');
    }

    public function doRun(InputInterface $input, OutputInterface $output)
    {
        $this->input = $input;
        $this->output = $output;

        $output->writeln('<fg=white;options=bold;bg=red>Code Quality Tool</fg=white;options=bold;bg=red>');
        $output->writeln('<info>Fetching files</info>');
        $files = $this->extractCommitedFiles();

        $output->writeln('<info>Check composer</info>');
        $this->checkComposer($files);

        $output->writeln('<info>Running PHPLint</info>');
        if (!$this->phpLint($files)) {
            throw new Exception('There are some PHP syntax errors!');
        }

        // $output->writeln('<info>Checking code style</info>');
        // if (!$this->codeStyle($files)) {
        //     throw new Exception(sprintf('There are coding standards violations!'));
        // }

        // $output->writeln('<info>Checking code style with PHPCS</info>');
        // if (!$this->codeStylePsr($files)) {
        //     throw new Exception(sprintf('There are PHPCS coding standards violations!'));
        // }

        // $output->writeln('<info>Checking code mess with PHPMD</info>');
        // if (!$this->phPmd($files)) {
        //     throw new Exception(sprintf('There are PHPMD violations!'));
        // }

        // $output->writeln('<info>Running unit tests</info>');
        // if (!$this->unitTests()) {
        //     throw new Exception('Fix the fucking unit tests!');
        // }

        $output->writeln('<info>Good job!</info>');
    }

    private function checkComposer($files)
    {
        $composerJsonDetected = false;
        $composerLockDetected = false;

        foreach ($files as $file) {
            if ($file === 'composer.json') {
                $composerJsonDetected = true;
            }

            if ($file === 'composer.lock') {
                $composerLockDetected = true;
            }
        }

        if ($composerJsonDetected && !$composerLockDetected) {
            throw new Exception('composer.lock must be commited if composer.json is modified!');
        }
    }

    private function extractCommitedFiles()
    {
        $output = array();
        $rc = 0;

        exec('git rev-parse --verify HEAD 2> /dev/null', $output, $rc);

        $against = '945a25fc22a5ffd70947f98cf2f5263e664d3663';
        if ($rc == 0) {
            $against = 'HEAD';
        }

        exec("git diff-index --cached --name-status $against | egrep '^(A|M)' | awk '{print $2;}'", $output);

        return $output;
    }

    private function phpLint($files)
    {
        $needle = '/(\.php)|(\.inc)|(\.module)$/';
        $succeed = true;

        foreach ($files as $file) {
            if (!preg_match($needle, $file)) {
                continue;
            }

            $process = new Process(array('php', '-l', $file));
            $process->run();

            if (!$process->isSuccessful()) {
                $this->output->writeln($file);
                $this->output->writeln(sprintf('<error>%s</error>', trim($process->getErrorOutput())));

                if ($succeed) {
                    $succeed = false;
                }
            }
        }

        return $succeed;
    }

    private function phPmd($files)
    {
        $needle = self::PHP_FILES_IN_SRC;
        $succeed = true;
        $rootPath = realpath(__DIR__ . '/../../');

        foreach ($files as $file) {
            if (!preg_match($needle, $file) || preg_match('/src\/AtrapaloLib\/ORM\/Doctrine\/DBAL\/Driver\/Adodb/', $file)) {
                continue;
            }

            $process = new Process(['php', 'bin/phpmd', $file, 'text', 'controversial']);
            $process->setWorkingDirectory($rootPath);
            $process->run();

            if (!$process->isSuccessful()) {
                $this->output->writeln($file);
                $this->output->writeln(sprintf('<error>%s</error>', trim($process->getErrorOutput())));
                $this->output->writeln(sprintf('<info>%s</info>', trim($process->getOutput())));
                if ($succeed) {
                    $succeed = false;
                }
            }
        }

        return $succeed;
    }

    private function unitTests()
    {
        $process = new Process(array('php', 'bin/phpunit'));
        $process->setWorkingDirectory(__DIR__ . '/../..');
        $process->setTimeout(3600);

        $process->run(function ($type, $buffer) {
            $this->output->write($buffer);
        });

        return $process->isSuccessful();
    }

    private function codeStyle(array $files)
    {
        $succeed = true;

        foreach ($files as $file) {
            $classesFile = preg_match(self::PHP_FILES_IN_CLASSES, $file);
            $srcFile = preg_match(self::PHP_FILES_IN_SRC, $file);

            if (!$classesFile && !$srcFile) {
                continue;
            }

            $fixers = '-psr0';
            if ($classesFile) {
                $fixers = 'eof_ending,indentation,linefeed,lowercase_keywords,trailing_spaces,short_tag,php_closing_tag,extra_empty_lines,elseif,function_declaration';
            }
            $process = new Process(array('php', 'bin/php-cs-fixer', '--dry-run', '--verbose', 'fix', $file, '--fixers='.$fixers));

            $process->setWorkingDirectory(__DIR__ . '/../../');
            $process->run();

            if (!$process->isSuccessful()) {
                $this->output->writeln(sprintf('<error>%s</error>', trim($process->getOutput())));

                if ($succeed) {
                    $succeed = false;
                }
            }
        }

        return $succeed;
    }

    private function codeStylePsr(array $files)
    {
        $succeed = true;
        $needle = self::PHP_FILES_IN_SRC;

        foreach ($files as $file) {
            if (!preg_match($needle, $file)) {
                continue;
            }

            $process = new Process(array('php', 'bin/phpcs', '--standard=PSR2', $file));
            $process->setWorkingDirectory(__DIR__ . '/../../');
            $process->run();

            if (!$process->isSuccessful()) {
                $this->output->writeln(sprintf('<error>%s</error>', trim($process->getOutput())));

                if ($succeed) {
                    $succeed = false;
                }
            }
        }

        return $succeed;
    }
}

$console = new CodeQualityTool();
$console->run();