Determining what classes are defined in a PHP class file

Question

Given that each PHP file in our project contains a single class definition, how can I determine what class or classes are defined within the file?

I know I could jus

Answer 1

I needed parse classes from file with namespaces, so I modified code. If somebody need too, here is it:

public function getPhpClasses($phpcode) {
    $classes = array();

    $namespace = 0;  
    $tokens = token_get_all($phpcode); 
    $count = count($tokens); 
    $dlm = false;
    for ($i = 2; $i < $count; $i++) { 
        if ((isset($tokens[$i - 2][1]) && ($tokens[$i - 2][1] == "phpnamespace" || $tokens[$i - 2][1] == "namespace")) || 
            ($dlm && $tokens[$i - 1][0] == T_NS_SEPARATOR && $tokens[$i][0] == T_STRING)) { 
            if (!$dlm) $namespace = 0; 
            if (isset($tokens[$i][1])) {
                $namespace = $namespace ? $namespace . "\\" . $tokens[$i][1] : $tokens[$i][1];
                $dlm = true; 
            }   
        }       
        elseif ($dlm && ($tokens[$i][0] != T_NS_SEPARATOR) && ($tokens[$i][0] != T_STRING)) {
            $dlm = false; 
        } 
        if (($tokens[$i - 2][0] == T_CLASS || (isset($tokens[$i - 2][1]) && $tokens[$i - 2][1] == "phpclass")) 
                && $tokens[$i - 1][0] == T_WHITESPACE && $tokens[$i][0] == T_STRING) {
            $class_name = $tokens[$i][1]; 
            if (!isset($classes[$namespace])) $classes[$namespace] = array();
            $classes[$namespace][] = $class_name;
        }
    } 
    return $classes;
}