A pre-commit hook to make PHP code PSR-2 compliant, check for syntax error and make Javascript code beautify with Esformatter

php-cs-fixer-and-esformatter-pre-commit.php

#!/usr/bin/php
<?php
/**
 * .git/hooks/pre-commit
 * original -> https://gist.github.com/mardix/3623562
 */

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

foreach ($output as $file) {
    
    $fileName = trim(substr($file, 1) );

    /**
     * PHP file
     */
    
    $ext = pathinfo($fileName,PATHINFO_EXTENSION);
    if ($ext == "php") {

        /**
         * Check for error
         */
        $lint_output = array();
        exec("php -l " . escapeshellarg($fileName), $lint_output, $return);

        if ($return == 0) {
 
        /**
         * PHP-CS-Fixer && add it back
         */
          exec("php-cs-fixer fix {$fileName} --level=psr2");
          exec("git add {$fileName}");

          //exec("echo php-cs-fixer fix {$fileName} --level=psr2 > {$fileName}.txt");

        } else {
            
           echo "\nYour commit has php syntax error(s).\nYou MUST fix it before commit.\n";
           echo "See 'php -l' error massage below.\n\n---------------------";
           echo implode("\n", $lint_output), "\n---------------------\n"; 
           exec("echo 'Your commit has php syntax error(s).' > GIT-COMMIT-ERROR.txt");
           exit(1);
           
        }

    /**
     * JS file
     */
    } elseif ($ext == "js") {

        /**
         * esformatter && add it back
         */
          exec("esformatter -i {$fileName} --config .esformatter");
          exec("git add {$fileName}");

    }

}

exit(0);