enlgish_to_gettext.php

<?php

define('MY_APP_DIR', __DIR__ . '/src');

function rsearch($folder, $pattern) {
  $dir = new RecursiveDirectoryIterator($folder);
  $ite = new RecursiveIteratorIterator($dir);
  $files = new RegexIterator($ite, $pattern, RegexIterator::GET_MATCH);
  $fileList = array();
  foreach($files as $file) {
    $fileList = array_merge($fileList, $file);
  }
  return $fileList;
}

$pot = "";
$msgids = [];
$cnt = 0;
foreach (rsearch(MY_APP_DIR, '/^.*\.phtml$/') as $filePath) {
  if (strpos($filePath, 'admin')) continue;
  $contents = file_get_contents($filePath);


  $matches = null;
  if (preg_match_all("/>(?=.*[a-zA-Z])(['.,\d\w\s\n\r]+)</im", $contents, $matches)) {
    foreach ($matches[0] as $msgid) {
      $msgid = str_replace('<', '', $msgid);
      $msgid = str_replace('>', '', $msgid);
      $contents = str_replace( $msgid, "<?= _(\"{$msgid}\"); ?>", $contents );
      file_put_contents($filePath, $contents);

      if (isset($msgids[$msgid])) continue;
      $cnt++;

      $msgids[$msgid] = 1;
      $pot .= "msgid \"{$msgid}\"\n";

      $pot .= "msgstr \"\"\n\n";
    }
  }
}

file_put_contents(__DIR__ . '/short_messages.po', $pot);

echo "In total {$cnt} messages";