如何使用PHP进行API文档自动生成

/**
 * API 接口定义
 */
interface API {
    /**
     * 获取用户信息
     * @param string $userId 用户 ID
     * @return User 用户信息
     * @throws UserNotExistsException 用户不存在异常
     */
    public function getUser($userId);

    /**
     * 创建用户
     * @param string $username 用户名
     * @param int $age 年龄
     * @return User 用户信息
     * @throws UserExistsException 用户已存在异常
     */
    public function createUser($username, $age);
}

/**
 * 用户类
 */
class User {
    public $userId;
    public $username;
    public $age;
}

/**
 * 使用反射 API 分析 API，生成文档信息数组
 * @param string $className 类名
 * @return array 文档信息数组
 */
function analyzeAPI($className): array {
    $apiDoc = array();

    $reflectionClass = new ReflectionClass($className);
    $methods = $reflectionClass->getMethods();
    foreach ($methods as $method) {
        // 忽略非公共方法和构造函数
        if (!($method->isPublic() && !$method->isConstructor())) {
            continue;
        }
        $apiName = $method->getName();
        // 获取参数名
        $parameters = $method->getParameters();
        $params = array();
        foreach ($parameters as $parameter) {
            $paramName = $parameter->getName();
            $paramType = "";
            if ($parameter->hasType()) {
                $paramType = $parameter->getType()->getName();
            }
            $params[] = array("name" => $paramName, "type" => $paramType);
        }
        // 获取返回值类型
        $returnType = "";
        if ($method->hasReturnType()) {
            $returnType = $method->getReturnType()->getName();
        }
        // 获取所有注释
        $docComment = $method->getDocComment();
        $annotations = array();
        if (!empty($docComment)) {
            $annotationMatches = array();
            preg_match_all('/@([^s]*)s*([^
]*)
/m', $docComment, $annotationMatches);
            foreach ($annotationMatches[1] as $key => $value) {
                $annotations[$value] = $annotationMatches[2][$key];
            }
        }
        $apiDoc[$apiName] = array(
            "name" => $apiName,
            "params" => $params,
            "returnType" => $returnType,
            "annotations" => $annotations
        );
    }
    return $apiDoc;
}

/**
 * 生成 API 文档 HTML
 * @param array $apiDoc API 文档信息数组
 * @return string
 */
function generateApiDocHtml($apiDoc): string {
    $html = "<table border='1' cellspacing='0'><tr><td>方法名</td><td>参数</td><td>返回值</td><td>注释</td></tr>";
    foreach ($apiDoc as $method) {
        $html .= "<tr><td>{$method['name']}</td><td>";
        foreach ($method['params'] as $value) {
            $html .= "{$value['type']} {$value['name']}, ";
        }
        $html .= "</td><td>{$method['returnType']}</td><td>";
        foreach ($method['annotations'] as $key => $value) {
            $html .= "$key: $value<br/>";
        }
        $html .= "</td></tr>";
    }
    $html .= "</table>";
    return $html;
}

$apiDoc = analyzeAPI('API');
echo generateApiDocHtml($apiDoc);