Script to clean unnecessary PHP use statements

clean-use.php

#!/usr/bin/env php
<?php

$paths = array();
if (isset($_SERVER['argv']))
{
  $paths = $_SERVER['argv'];
  array_shift($paths);

  if (!$paths)
  {
    $paths[] = '.';
  }
}

foreach ($paths as $path)
{
  if (!$realpath = realpath($path)) throw new Exception("Unable to resolve path '".$path."'.");

  cleanUse($realpath);
}

function cleanUse($path)
{
  if (is_dir($path))
  {
    foreach (glob($path.DIRECTORY_SEPARATOR.'*') as $subPath)
    {
      cleanUse($subPath);
    }

    return;
  }
  
  echo "Cleaning '".$path."'".PHP_EOL;

  $content = file_get_contents($path);

  if ('<?php' != substr($content, 0, 5)) return;
  if (!preg_match_all('/^use (?<name>.*?)(?:as (?<alias>.*))?;$/m', $content, $matches, PREG_OFFSET_CAPTURE)) return;

  $useNames = array();
  foreach ($matches['name'] as $matchNumber => $match)
  {
    $name = explode('\\', $match[0]);
    $useNames[$matchNumber] = array_pop($name);
  }
  foreach ($matches['alias'] as $matchNumber => $match)
  {
    if (!$match || !$match[0]) continue;

    $useNames[$matchNumber] = $match[0];
  }

  $lastMatch = $matches[0][count($matches[0]) - 1];
  $offset = $lastMatch[1] + strlen($lastMatch[0]);

  $unusedNames = array();
  foreach ($useNames as $useName)
  {
    if (preg_match('/\b'.preg_quote($useName, '/').'\b/', $content, $matches, null, $offset)) continue;

    $unusedNames[] = $useName;
  }

  if (!$unusedNames) return;

  echo "Found unused 'use'(s) in '".$path."':".PHP_EOL;
  foreach ($unusedNames as $unusedName)
  {
    echo "  - '".$unusedName."'".PHP_EOL;
  }

  echo 'Removing...';
  foreach ($unusedNames as $unusedName)
  {
    $content = preg_replace('/^use .*'.preg_quote($unusedName, '/').';$\s/m', '', $content);
  }
  file_put_contents($path, $content);
  echo 'done.'.PHP_EOL;
}