set_include_path('/xampp/htdocs/test/include');　　//请注意php里边的'/'代表的不是网站根目录,而是文件所在的盘符,可用echo realpath('/');查看
//若php版本过低，该函数不支持,可用通用版ini_set()

/*查看真实默认包含路径*/
echo realpath(get_include_path());
/*要包含cls.mysqli.php只需要*/
require_once('cls.mysqli.php');
$mysql = new Mysql('localhost','root','','test');　　//实例化和之后的查询语句并无错误

<?php
class SingetonBasic {
private static $instance;

// other vars..

private function __construct() {
// do construct..
}

private function __clone() {}

public static function getInstance() {
if (!(self::$instance instanceof self)) {
self::$instance = new self();
}
return self::$instance;
}

// other functions..
}

$a = SingetonBasic::getInstance();
$b = SingetonBasic::getInstance();
var_dump($a === $b);

<?php
class FactoryBasic {
public static function create($config) {

}
}

<?php

// 定义形状的公共功能：获取周长和面积。
interface IShape {
function getCircum();
function getArea();
}

// 定义矩形类
class Rectangle implements IShape {
private $width, $height;

public function __construct($width, $height) {
$this->width = $width;
$this->height = $height;
}

public function getCircum() {
return 2 * ($this->width + $this->height);
}

public function getArea() {
return $this->width * $this->height;
}
}

// 定义圆类
class Circle implements IShape {
private $radii;

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

public function getCircum() {
return 2 * M_PI * $this->radii;
}

public function getArea() {
return M_PI * pow($this->radii, 2);
}
}

// 根据传入的参数个数不同来创建不同的形状。
class FactoryShape {
public static function create() {
switch (func_num_args()) {
case 1:
return new Circle(func_get_arg(0));
break;
case 2:
return new Rectangle(func_get_arg(0), func_get_arg(1));
break;

}
}
}

// 矩形对象
$c = FactoryShape::create(4, 2);
var_dump($c->getArea());
// 圆对象
$o = FactoryShape::create(2);
var_dump($o->getArea());

<?php
// 观察者接口
interface IObserver {
function onListen($sender, $args);
function getName();
}

// 可被观察接口
interface IObservable {
function addObserver($observer);
function removeObserver($observer_name);
}

// 观察者类
abstract class Observer implements IObserver {
protected $name;

public function getName() {
return $this->name;
}
}

// 可被观察类
class Observable implements IObservable {
protected $observers = array();

public function addObserver($observer) {
if (!($observer instanceof IObserver)) {
return;
}
$this->observers[] = $observer;
}

public function removeObserver($observer_name) {
foreach ($this->observers as $index => $observer) {
if ($observer->getName() === $observer_name) {
array_splice($this->observers, $index, 1);
return;
}
}
}
}

// 模拟一个可以被观察的类：RadioStation
class RadioStation extends Observable {

public function addListener($listener) {
foreach ($this->observers as $observer) {
$observer->onListen($this, $listener);
}
}
}

// 模拟一个观察者类
class RadioStationLogger extends Observer {
protected $name = 'logger';

public function onListen($sender, $args) {
echo $args, ' join the radiostation.<br/>';
}
}

// 模拟另外一个观察者类
class OtherObserver extends Observer {
protected $name = 'other';
public function onListen($sender, $args) {
echo 'other observer..<br/>';
}
}

$rs = new RadioStation();

// 注入观察者
$rs->addObserver(new RadioStationLogger());
$rs->addObserver(new OtherObserver());

// 移除观察者
$rs->removeObserver('other');

// 可以看到观察到的信息
$rs->addListener('cctv');
?>