PHP 系列 (二)

获取微信头像时, 将头像地址尾部的 /0 替换成 /96, 即是获取微信头像缩略图

<?php
$headImg = 'http://wx.qlogo.cn/mmopen/3NKFAMZl61HUWEYUkOK5oPib1GqOlMWYk7tt1N6WNeqvychibiaU4A0nynlYz4aOHcvNdhDla0bicpDJOdZJrQ6u6vANnktos0eI/0';
if (($index = strrpos($headImg, '/0')) !== false) {
    $thumbHeadImg = substr_replace($headImg, '/96', $index);
}

伪造IP

/**
 * 伪造IP
 *
 * @param string $url
 *
 * @return mixed
 */
function forged_ip($url)
{
    $header = array(
        'CLIENT-IP:' . '111.111.111.' . rand(1, 254),
        'X-FORWARDED-FOR:' . '111.111.111.' . rand(1, 254),
    );
    $userAgentArr = array(
        'Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/4.0; .NET CLR 2.0.50727; InfoPath.2; AskTbPTV/5.17.0.25589; Alexa Toolbar)',
        'Mozilla/5.0 (Windows NT 5.1; rv:22.0) Gecko/20100101 Firefox/22.0',
        'Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/4.0; .NET4.0C; Alexa Toolbar)',
        'Mozilla/4.0(compatible; MSIE 6.0; Windows NT 5.1; SV1)',
        $_SERVER['HTTP_USER_AGENT']
    );
    $userAgent = $userAgentArr[rand(0, 3)];
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_HTTPHEADER, $header);
    curl_setopt($ch, CURLOPT_REFERER, $url);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
    curl_setopt($ch, CURLOPT_USERAGENT, $userAgent);
    curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 7);
    $result = curl_exec($ch);
    curl_close($ch);

    return $result;
}

使用 ReflectionClass ReflectionProperty 创建实例并初始化

<?php
class User
{
    private $id;

    private $nickname;

    private $age;

    private $registerTime;
}

// 用户数据
$userData = [
    'id' => 1,
    'nickname' => 'test',
    'age' => 12,
    'registerTime' => new DateTime(),
];
// 类名
$className = 'User';
// 反射类
$reflectionClass = new ReflectionClass($className);
// 创建类的实例
$instance = $reflectionClass->newInstanceWithoutConstructor();
foreach ($userData as $key => $val) {
    // 类属性已定义
    if ($reflectionClass->hasProperty($key)) {
        // 获取类属性的相关信息
        $reflectionProperty = new ReflectionProperty($className, $key);
        // 属性未公开
        if (!$reflectionProperty->isPublic()) {
            // 将属性设置为可访问
            $reflectionProperty->setAccessible(true);
        }

        // 设置属性值
        $reflectionProperty->setValue($instance, $val);
    }
}
var_dump($instance);

使用 ReflectionClass ReflectionMethod 实现前置/后置方法功能模块, 执行带参数的方法

class IndexController
{
    public function indexAction(){
        echo 'index<br />';
    }

    public function testAction($year = 2012, $month = 2, $day = 21)
    {
        echo $year . '--------' . $month . '-----------' . $day . '<br />';
    }

    public function _before_index()
    {
        echo __FUNCTION__ . '<br />';
    }

    public function _after_index()
    {
        echo __FUNCTION__ . '<br />';
    }
}

// 执行index方法
$method = new ReflectionMethod('IndexController', 'indexAction');
// 进行权限判断
if ($method->isPublic()) {
    $class = new ReflectionClass('IndexController');
    // 执行前置方法
    if ($class->hasMethod('_before_index')) {
        $beforeMethod = $class->getMethod('_before_index');
        if ($beforeMethod->isPublic()) {
            $beforeMethod->invoke(new IndexController);
        }
    }

    $method->invoke(new IndexController);

    // 执行后置方法
    if($class->hasMethod('_after_index')){
        $beforeMethod = $class->getMethod('_after_index');
        if ($beforeMethod->isPublic()) {
            $beforeMethod->invoke(new IndexController);
        }
    }
}

// 执行带参数的方法
$method = new ReflectionMethod('IndexController', 'testAction');
$params = $method->getParameters();
foreach ($params as $param ) {
    $paramName = $param->getName();
    if (isset($_REQUEST[$paramName])) {
        $args[] = $_REQUEST[$paramName];
    } elseif ($param->isDefaultValueAvailable()) {
        $args[] = $param->getDefaultValue();
    }
}
if (count($args) == $method->getNumberOfParameters()) {
    $method->invokeArgs(new IndexController, $args);
} else {
    echo 'parameters is not match!';
}

ArrayAccess 使对象可以像数组一样被访问
JsonSerializable 自定义JSON化的结果

<?php
class Configuration implements JsonSerializable, ArrayAccess
{
    private static $config;
    private $configArray;

    private function __construct()
    {
        $this->configArray = [
            'a' => 1,
            'b' => 2
        ];
    }

    public static function instance()
    {
        if (self::$config == null) {
            self::$config = new Configuration();
        }

        return self::$config;
    }

    public function jsonSerialize()
    {
        return 'Custom Json：' . serialize(new Configuration());
    }

    public function offsetExists($offset)
    {
        return isset($this->configArray[$offset]);
    }

    public function offsetGet($offset)
    {
        return $this->configArray[$offset];
    }

    public function offsetSet($offset, $value)
    {
        $this->configArray[$offset] = $value;
    }

    public function offsetUnset($offset)
    {
        unset($this->configArray[$offset]);
    }
}

$configuration = Configuration::instance();

var_dump($configuration['a']); // 输出 1
$configuration['a'] = 3;
var_dump($configuration['a']); // 输出 3

var_dump(isset($configuration['b'])); // 输出 true
var_dump(isset($configuration['c'])); // 输出 false

unset($configuration['b']);
var_dump(isset($configuration['b'])); // 输出 false

var_dump(json_encode($configuration)); // 输出 Custom Json\uff1aO:13:\"Configuration\":1:{s:26:\"\u0000Configuration\u0000configArray\";a:2:{s:1:\"a\";i:1;s:1:\"b\";i:2;}}