Extract classnames from a php file.

gistfile1.php

<?php
 Class LegacyAutoloader
 {
 /**
     * Tokenize a php file and extract all classes defined inside.
     * @param $filePath
     * @return array
     */
    public static function extractClasses($filePath){
        $classNames = array();
        $tokens = token_get_all(file_get_contents($filePath));
        $intTokens = count($tokens);
        $pos = 0;
        while($pos < $intTokens){
            if($tokens[$pos][0] == T_CLASS){
                $classNames[] = $tokens[$pos+2][1];
            }
            $pos++;
        }
        //var_dump($classNames);
        return $classNames;
    }

    /**
     * Walk a directory and extract Classes from each php file.
     */
    public static function mapClassesRecursive($baseFolder){
      $it = new RecursiveIteratorIterator(new RecursiveDirectoryIterator($baseFolder), RecursiveIteratorIterator::SELF_FIRST);
      $classMap = array();
      foreach($it as $fileInfo){
        if(!$fileInfo->isDir()){
          $classes = self::extractClasses($fileInfo->getRealPath());
          foreach($classes as $class){
            $classMap[$class] = $fileInfo->getRealPath();
          }
        }
      }
      return $classMap;
    }
 }

//sample usage 
//LegacyAutoloader::mapClassesRecursive('/var/www/html/lib');