PHP中如何实现适配器模式来适配不同设计模式的代码实例？

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从 http://www.lai18.com/ 适配目标，规定的接口将被适配对象实现interface IDatabase{ public function connect($host, $username, $password, $database); public function query($sql);} 适配器类 class Mysql implements IDatab

//From www.lai18.com //适配目标，规定的接口将被适配对象实现 interface IDatabase { public function connect($host, $username, $password, $database); public function query($sql); } //适配器 class Mysql implements IDatabase { protected $connect; public function connect($host, $username, $password, $database) { $connect = mysql_connect($host, $username, $password); mysql_select_db($database, $connect); $this->connect = $connect; //... } public function query($sql) { //... } } //适配器 class Postgresql implements IDatabase { protected $connect; public function connect($host, $username, $password, $database) { $this->connect = pg_connect("host=$host dbname=$database user=$username password=$password"); //... } public function query($sql) { //... } } //客户端使用 $client = new Postgresql(); $client->query($sql);