Short open tag

replace-short-tags.php

<?php

/**
 * find -name "*.php" -exec php -d short_open_tag=On replace-short-tags.php {} \
 */

if(!isset($argv[1])) {
  fwrite(STDERR, 'ch');
  exit(1);
}

$content = file_get_contents($argv[1]);
$tokens = token_get_all($content);
$output = '';

foreach($tokens as $token) {
 if(is_array($token)) {
  list($index, $code, $line) = $token;
  switch($index) {
   case T_OPEN_TAG:
    if(strpos($code, "<?php") === false) {
     $space = substr($code, -1);
     $space = trim($space) ? '' : $space;
     $code = "<?php" . $space;
    }
  }
  $output .= $code;
 }
 else {
  $output .= $token;
 }
}
file_put_contents($argv[1], $output);