Get class name from file

Question

I have a php file which contains only one class. how can I know what class is there by knowing the filename? I know I can do something with regexp matching but is there a st

Answer 1

Thanks to some people from Stackoverflow and Github, I was able to write this amazing fully working solution:

/**
 * get the full name (name \ namespace) of a class from its file path
 * result example: (string) "I\Am\The\Namespace\Of\This\Class"
 *
 * @param $filePathName
 *
 * @return  string
 */
public function getClassFullNameFromFile($filePathName)
{
    return $this->getClassNamespaceFromFile($filePathName) . '\\' . $this->getClassNameFromFile($filePathName);
}


/**
 * build and return an object of a class from its file path
 *
 * @param $filePathName
 *
 * @return  mixed
 */
public function getClassObjectFromFile($filePathName)
{
    $classString = $this->getClassFullNameFromFile($filePathName);

    $object = new $classString;

    return $object;
}





/**
 * get the class namespace form file path using token
 *
 * @param $filePathName
 *
 * @return  null|string
 */
protected function getClassNamespaceFromFile($filePathName)
{
    $src = file_get_contents($filePathName);

    $tokens = token_get_all($src);
    $count = count($tokens);
    $i = 0;
    $namespace = '';
    $namespace_ok = false;
    while ($i < $count) {
        $token = $tokens[$i];
        if (is_array($token) && $token[0] === T_NAMESPACE) {
            // Found namespace declaration
            while (++$i < $count) {
                if ($tokens[$i] === ';') {
                    $namespace_ok = true;
                    $namespace = trim($namespace);
                    break;
                }
                $namespace .= is_array($tokens[$i]) ? $tokens[$i][1] : $tokens[$i];
            }
            break;
        }
        $i++;
    }
    if (!$namespace_ok) {
        return null;
    } else {
        return $namespace;
    }
}

/**
 * get the class name form file path using token
 *
 * @param $filePathName
 *
 * @return  mixed
 */
protected function getClassNameFromFile($filePathName)
{
    $php_code = file_get_contents($filePathName);

    $classes = 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];
            $classes[] = $class_name;
        }
    }

    return $classes[0];
}