<?php
class mysql{
    function connect($db){
        echo "连接mysql数据库${db[0]} \r\n";
    }
}

class oracle{
    function connect($db){
        echo "连接oracle数据库${db[0]} \r\n";
    }
}

class sqlproxy{
    private $target;
    function __construct($tar){
        $this->target[] = new $tar();
    }

    function __call($name,$args){
        foreach ($this->target as $obj) {
            $r = new ReflectionClass($obj);
            if($method = $r->getMethod($name)){
                    if($method->isPublic() && !$method->isAbstract()){
                        $method->invoke($obj,$args);
                    }
            }
        }
    }
}

$mysql = new sqlproxy('mysql');
$mysql->connect('member');

$oracle = new sqlproxy('oracle');
$oracle->connect('member');

这里 sqlproxy起到一个代理的作用，使用时无需关注 mysql和oracle的实现