A pre-commit hook to check syntax errors and PSR2

php-cs-fixer-pre-commit.php

#!/usr/bin/php
<?php
/**
 * .git/hooks/pre-commit
 * 
 * This pre-commit hooks will check for PHP error (lint), and make sure the code
 * is PSR compliant.
 * 
 * Dependecy: PHP-CS-Fixer (https://github.com/fabpot/PHP-CS-Fixer)
 * 
 * @author  Mardix  http://github.com/mardix 
 * @since   Sept 4 2012
 * 
 */

/**
 * collect all files which have been added, copied or
 * modified and store them in an array called output
 */
exec('git diff --cached --name-only --diff-filter=ACM', $output);

foreach ($output as $fileName) {
    /**
     * Only PHP file
     */
    if (pathinfo($fileName,PATHINFO_EXTENSION) == "php") {

        $lintOutput = [];

        exec("php -l " . escapeshellarg($fileName), $lintOutput, $lintExitCode);

        if ($lintExitCode != 0) {
            
           echo implode("\n", $lint_output), "\n"; 
           
           exit(1);
        }

        $csOutput = [];

        exec("phpcs --standard=PSR2 {$fileName};", $csOutput, $csExitCode);

        if ($csExitCode != 0) {
            echo implode("\n", $csOutput), "\n"; 
           
            exit(1);
        }
    }
}

exit(0);