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laravel依赖注入原理
众所周知laravel的文档对于依赖注入只写了如何使用,相信大多数人对于他的实现原理并不太清楚,这个帖子就通过一个小demo来简述实现原理,demo如下,该demo可直接运行:
<?php
namespace Database;
use ReflectionMethod;
class Database
{
protected $adapter;
public function __construct ()
{}
public function test (MysqlAdapter $adapter)
{
$adapter->test();
}
}
class MysqlAdapter
{
public function test ()
{
echo "i am MysqlAdapter test";
}
}
class app
{
public static function run ($instance, $method)
{
if (! method_exists($instance, $method))
return null;
$reflector = new ReflectionMethod($instance, $method);
$parameters = [
1
];
foreach ($reflector->getParameters() as $key => $parameter)
{
$class = $parameter->getClass();
if ($class)
{
array_splice($parameters, $key, 0, [
new $class->name()
]);
}
}
call_user_func_array([
$instance,
$method
], $parameters);
}
}
app::run(new Database(), 'test');
原理主要运用了PHP反射api的ReflectionMethod类,在PHP运行状态中,扩展分析PHP程序。具体使用可查看手册。
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