A pre-commit hook to make PHP code PSR-2 compliant, check for syntax error

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-status --diff-filter=ACM', $output);

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

    /**
     * Only PHP file
     */
    if (pathinfo($fileName,PATHINFO_EXTENSION) == "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 {$fileName} --level=all; git add {$fileName}");

        } else {
            
           echo implode("\n", $lint_output), "\n"; 
           
           exit(1);
           
        }

    }

}

exit(0);

You may use --name-only parameter of git diff in order to get only name of ACM files

Here is a shell script too.

#!/bin/bash

while read -r file;
do
  file=${file:1}
  if [[ $file = *.php ]];
  then    
    php-cs-fixer fix "$file" --level=psr2
    git add "$file"
  fi
done < <(git diff --cached --name-status --diff-filter=ACM)

Here is an implementation using PHP Code Sniffer:

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

$isViolated = 0;
$violatedFiles = array();
// $php_cs_path = "/usr/local/bin/php-cs-fixer";
$php_cs_path = "~/.composer/vendor/bin/phpcs";

foreach ($output as $fileName) {
    // Consider only PHP file for processing
    if (pathinfo($fileName, PATHINFO_EXTENSION) == "php") {
        $psr_output = array();
 
        // Put the changes to be made in $psr_output, if not as per PSR2 standard
        
        // php-cs-fixer
        // exec("{$php_cs_path} fix {$fileName} --rules=@PSR2 --dry-run --diff", $psr_output, $return);
        
        // php-code-sniffer
        exec("{$php_cs_path} --standard=PSR2 --colors -n {$fileName}", $psr_output, $return);
      
        if ($return != 0) {
            $isViolated = 1;
            $violatedFiles[] = $fileName;
            echo implode("\n", $psr_output), "\n";
        }
    }
}
if ($isViolated == 1) {
    echo "\n---------------------------- IMPORTANT --------------------------------\n";
    echo "\nPlease use the suggestions above to fix the code in the following file: \n";
    echo " => " . implode("\n => ", $violatedFiles);
    echo "\n-----------------------------------------------------------------------\n\n\n";
    exit(1);
} else {
    echo "\n => Committed Successfully :-)\n\n";
    exit(0);
}