Small php script create file-separated patches with git

patch.php

#!/usr/bin/env php

<?php

# usage: ./patch kerbyfc origin/devel 'json|yml|js|html|yaml|rb|Gemfile|lock|coffee|png|jpg|ico|gif|txt|scss|css|stylus|cfg|md|map$'

$auth = $argv[1];
$to = $argv[2];
$grep = $argv[3];
$preview_only = $argv[4];

$cmd = "git diff --name-only --author='$auth' $to HEAD | grep -E '$grep'";

exec($cmd, $files, $returnGit);

if ($preview_only) {

  var_dump($files);
  var_dump($cmd);

} else {
  if ($returnGit == 0) {
      $mdReturn = 0;
      $csReturn = 0;
      $mdErrors = [];
      $csErrors = [];

      foreach ($files as $file) {
          if (!file_exists($file)) {
              echo $file, PHP_EOL;
              continue;
          }

          $i = strripos($file, "/");
          $path = substr($file, 0, $i);
          exec(
            "git format-patch $to '$file' --output-directory=$path",
              $csErrors,
              $csReturnOne
          );
      }
      echo $csVersion, PHP_EOL, trim(implode(PHP_EOL, $csErrors));
  }
}