PHP实现控制反转模式（附完整源码）
<?php
// 定义一个接口
interface DatabaseInterface
{
public function query($sql);
}
// 实现接口
class MySQLDatabase implements DatabaseInterface
{
public function query($sql)
{
echo "执行MySQL查询：{$sql}\n";
}
}
// IoC容器类
class Container
{
private $bindings = [];
public function bind($abstract, $concrete)
{
$this->bindings[$abstract] = $concrete;
}
public function resolve($abstract)
{
if (isset($this->bindings[$abstract])) {
$concrete = $this->bindings[$abstract];
if ($concrete instanceof Closure) {
return $concrete();
}
return new $concrete();
}
throw new Exception("无法解析抽象类: {$abstract}");
}
}
// 使用示例
$container = new Container();
// 绑定接口和实现类
$container->bind('DatabaseInterface', 'MySQLDatabase');
// 解析接口，获取实例
$database = $container->resolve('DatabaseInterface');
// 使用实例
$database->query('SELECT * FROM users');
`