Home > Backend Development > PHP Tutorial > Reflection instance analysis of PHP advanced features

Reflection instance analysis of PHP advanced features

小云云
Release: 2023-03-19 16:02:01
Original
1451 people have browsed it

反射是指PHP在运行状态中,动态的获取类、方法、属性、参数、注释等信息和动态调用对象的方法的功能。PHP5 开始提供了完整的反射API。有反射类(ReflectionClass)和反射函数(ReflectionFunction)等,功能大同小异,这里主要以ReflectionClass为列说明。

有什么用
可以帮助我们构建复杂的,可扩的运用。比如自动加载插件,自动生成文档等

代码示例
该示例为一个通用API入口

HttpApi.php

namespace twinkle\service\http;

class HttpApi
{
    private $class;

    public function __construct($class)
    {
        $this->class = $class;
    }

    public function parseRequest($method,$params = [])
    {
        $class = new \ReflectionClass($this->class);
        $instance = $class->newInstanceArgs($params);
        $method = $class->getMethod($method);
        $args = [];
        foreach ($method->getParameters() as $param) {
            $name = $param->getName();
            if (isset($params[$name])) {
                $args[$name] = $params[$name];
            } else {
                try {
                    $args[$name] = $param->getDefaultValue();
                } catch (\Exception $e) {
                    throw new RequestException(
                        '请求参数不合未能',
                        500
                    );
                }
            }
        }

        return [$instance,$method,$args];
    }
}
Copy after login

NotFoundService.php

namespace app\services;

use app\base\Service;

class NotFoundService extends Service
{
    public function error()
    {
        return $this->format(['status' => 1, 'msg' => '请求不合法,请确认service和method是否存在']);
    }
}
Copy after login

使用范例

$params = $_REQUEST;
$serviceName= isset($params['service']) ? $params['service'] : 'NotFound';
$methodName= isset($params['method']) ? $params['method'] : 'error';
$class = '\\app\\services\\' . Str::ucWords($serviceName) . 'Service';
list($instance, $method, $args) = (new HttpApi($class))->parseRequest($methodName, $params);
echo json_encode(($method->invokeArgs($instance, $args)));
Copy after login

相关推荐:

PHP的反射与自动加载

PHP通过反射从而获取一个类中所有的方法讲解

php中反射如何获取一个类中的方法详解


The above is the detailed content of Reflection instance analysis of PHP advanced features. For more information, please follow other related articles on the PHP Chinese website!

Related labels:
source:php.cn
Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
Popular Tutorials
More>
Latest Downloads
More>
Web Effects
Website Source Code
Website Materials
Front End Template