手寫PHP API框架（三）之反射介紹

<?php


function p($msg, $var)
{
    echo($msg.":".print_r($var, true)).PHP_EOL.PHP_EOL;
}


class Demo
{
    private $id;

    protected $name;

    public $skills = [];

    public function __construct($id, $name, $skills = [])
    {
        $this->id = $id;
        $this->name = $name;
        $this->skills = $skills;
    }

    public function getName()
    {
        return $this->name;
    }
    public function getSkill()
    {
        p('skill', $this->skills);
    }
}


$ref = new ReflectionClass('Demo');
if ($ref->isInstantiable()) {
    p('檢查類是否可範例化isInstantiable', null);
}
$constructor = $ref->getConstructor();
p('獲取建構函式getConstructor', $constructor);

$parameters = $constructor->getParameters();
foreach ($parameters as $param) {
    p('獲取引數getParameters', $param);
}

if ($ref->hasProperty('name')) {
    $attr = $ref->getProperty('name');
    p('獲取屬性getProperty', $attr);
}

$attributes = $ref->getProperties();
foreach ($attributes as $row) {
    p('獲取屬性列表getProperties', $row->getName());
}

if ($ref->hasMethod('getSkill')) {
    $method = $ref->getMethod('getSkill');
    p('獲取方法getMethod', $method);
}

$methods = $ref->getMethods();
foreach ($methods as $row) {
    p('獲取方法列表getMethods', $row->getName());
}

$instance = $ref->newInstanceArgs([1, 'sai', ['php', 'js']]);
p('newInstanceArgs', $instance);

➜  php git:(main) php reflect.php 

檢查類是否可範例化isInstantiable:

獲取建構函式getConstructor:ReflectionMethod Object
(
    [name] => __construct
    [class] => Demo
)


獲取引數getParameters:ReflectionParameter Object
(
    [name] => id
)


獲取引數getParameters:ReflectionParameter Object
(
    [name] => name
)


獲取引數getParameters:ReflectionParameter Object
(
    [name] => skills
)


獲取屬性getProperty:ReflectionProperty Object
(
    [name] => name
    [class] => Demo
)


獲取屬性列表getProperties:id

獲取屬性列表getProperties:name

獲取屬性列表getProperties:skills

獲取方法getMethod:ReflectionMethod Object
(
    [name] => getSkill
    [class] => Demo
)


獲取方法列表getMethods:__construct

獲取方法列表getMethods:getName

獲取方法列表getMethods:getSkill

newInstanceArgs:Demo Object
(
    [id:Demo:private] => 1
    [name:protected] => sai
    [skills] => Array
        (
            [0] => php
            [1] => js
        )

)