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

Use PHP's function get_declared_classes(). This returns an array of classes defined in the current script.

Answer 2

I've extended Venkat D's answer a bit to include returning the methods, and to search through a directory. (This specific example is built for CodeIgniter, which will return all the methods in the ./system/application/controller files - in other words, every public url that you can call through the system.)

function file_get_php_classes($filepath,$onlypublic=true) {
    $php_code = file_get_contents($filepath);
    $classes = get_php_classes($php_code,$onlypublic);
    return $classes;
}

function get_php_classes($php_code,$onlypublic) {
    $classes = array();
    $methods=array();
    $tokens = token_get_all($php_code);
    $count = count($tokens);
    for ($i = 2; $i < $count; $i++) {
        if ($tokens[$i - 2][0] == T_CLASS
        && $tokens[$i - 1][0] == T_WHITESPACE
        && $tokens[$i][0] == T_STRING) {
            $class_name = $tokens[$i][1];
            $methods[$class_name] = array();
        }
        if ($tokens[$i - 2][0] == T_FUNCTION
        && $tokens[$i - 1][0] == T_WHITESPACE
        && $tokens[$i][0] == T_STRING) {
            if ($onlypublic) {
                if ( !in_array($tokens[$i-4][0],array(T_PROTECTED, T_PRIVATE))) {
                    $method_name = $tokens[$i][1];
                    $methods[$class_name][] = $method_name;
                }
            } else {
                $method_name = $tokens[$i][1];
                $methods[$class_name][] = $method_name;
            }
        }
    }
    return $methods;
}

function mapSystemClasses($controllerdir="./system/application/controllers/",$onlypublic=true) {
    $result=array();
    $dh=opendir($controllerdir);
    while (($file = readdir($dh)) !== false) {
        if (substr($file,0,1)!=".") {
            if (filetype($controllerdir.$file)=="file") {
                $classes=file_get_php_classes($controllerdir.$file,$onlypublic);
                foreach($classes as $class=>$method) {
                    $result[]=array("file"=>$controllerdir.$file,"class"=>$class,"method"=>$method);

                }
            } else {
                $result=array_merge($result,mapSystemClasses($controllerdir.$file."/",$onlypublic));
            }
        }
    }
    closedir($dh);
    return $result;
}