[英]How to dynamically instantiate an object in PHP?
Can we dynamically create and initialize an object in PHP? 我们可以在PHP中动态创建和初始化对象吗? This is the normal code:
这是正常的代码:
class MyClass{
var $var1 = null;
var $var2 = null;
.
.
public function __construct($args){
foreach($args as $key => $value)
$this->$key = $value;
}
}
---------------------
$args = ($_SERVER['REQUEST_METHOD'] == "POST") ? $_POST : $_REQUEST;
$obj = new MyClass($args);
The above code works fine. 上面的代码工作正常。 Please note that the names of REQUEST parameters are accurately mapped with the members of class MyClass .
请注意, REQUEST参数的名称与MyClass类的成员准确对应。
But can we do something like this: 但我们可以做这样的事情:
$class = "MyClass";
$obj = new $class;
If we can do like this, then can we initialize $obj by using $args . 如果我们可以这样做,那么我们可以使用$ args初始化$ obj 。
According to this post , $obj = $class should work. 根据这篇文章 , $ obj = $ class应该有效。 But it does not work for me.
但它对我不起作用。 I tried get_class_vars($obj) .
我试过get_class_vars($ obj) 。 It threw an exception.
它引发了一个例外。
Thanks 谢谢
You can use Reflection to instanciate an object with parameters. 您可以使用Reflection来使用参数实例化对象。
<?php
class Foo {
protected $_foo;
protected $_bar;
public function __construct($foo, $bar)
{
$this->_foo = $foo;
$this->_bar = $bar;
}
public function run()
{
echo $this->_foo . ' ' . $this->_bar . PHP_EOL;
}
}
$objectClass = 'Foo';
$args = array('Hello', 'World');
$objectReflection = new ReflectionClass($objectClass);
$object = $objectReflection->newInstanceArgs($args);
$object->run();
See Reflection on php manual. 请参阅php手册上的反思 。
You have to overload some other magic methods : 你必须重载一些其他魔术方法 :
Please see this codepad to see your code rewritten to work with what you want: 请查看此键盘以查看您的代码是否已重写以符合您的要求:
<?php
class MyClass{
var $properties = array();
public function __construct($args){
$this->properties = $args;
}
public function __get($name) {
echo "Getting '$name'\n";
if (array_key_exists($name, $this->properties)) {
return $this->properties[$name];
}
return null;
}
}
$args = array("key1" => "value1", "key2" => "value2");
$class = "MyClass";
$obj = new $class($args);
echo "key1:". $obj->key1;
?>
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