[英]PHP: How to instantiate a class from a property 'className'
Imagine this code:想象一下这段代码:
class MyClass
{
private string $className;
public function __construct(string $className)
{
$this->className = $className;
}
public function instantiateClass()
{
$className = $this->className;
return new $className();
}
}
Is there a way to instantiate the class without first assigning the property value to the local variable $className
in method instantiateClass()
?有没有办法实例化 class 而不首先在方法instantiateClass()
中将属性值分配给局部变量$className
?
Something like this:像这样的东西:
class MyClass
{
private string $className;
public function __construct(string $className)
{
$this->className = $className;
}
public function instantiateClass()
{
// This cannot be done as 'className' should be a method, not the property
return new $this->className();
}
}
Any ideas?有任何想法吗?
So, as pointed out by @Cid in the comments below my question, the solution is actually the one I thought was wrong:因此,正如@Cid 在我的问题下面的评论中指出的那样,解决方案实际上是我认为错误的解决方案:
class MyClass { private string $className; class MyClass { 私有字符串 $className; public function __construct(string $className) { $this->className = $className;公共 function __construct(string $className) { $this->className = $className; } }
public function instantiateClass()
{
// This works! It doesn't find a method, but reads the property correctly!
return new $this->className();
}
} }
you can use __CLASS__
or self::
or static::
您可以使用__CLASS__
或self::
或static::
you can try你可以试试
class MyClass
{
public function __construct()
{
}
static public function instantiateClass()
{
return new self();
}
static public function instantiateClassWithStatic()
{
return new static();
}
}
$myInstance = MyClass::instantiateClass();
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