Is there any way to get the caller function with something else than debug_backtrace()?
I'm looking for a less greedy way to simulate scopes like friend or internal.
Let's say I have a class A and a class B.
Until now, I've been using debug_backtrace(), which is too greedy (IMHO).
I thought of something like this:
<?php
class A
{
public function __construct(B $callerObj) {}
}
class B
{
public function someMethod()
{
$obj = new A($this);
}
}
?>
It might be OK if you want to limit it to one specific class, but let's say I have 300 classes, and I want to limit it to 25 of them?
One way could be using an interface to aggregate:
public function __construct(CallerInterface $callerObj)
But it's still an ugly code.
Moreover, you can't use that trick with static classes.
Have any better idea?
You can call debug_backtrace(FALSE), which will then not populate the object index. This will speed it up a little bit, but generally, debug_backtrace is to be avoided in production code, unless your app is software tool where speed is not an issue or when using it for error handling.
From what I understand, you want to
- have an implicit reference to the caller available in the callee and
- outside access to private and protected properties to selected classes.
Both does not exist in PHP (and breaks encapsulation imho). For a discussion, please see
PHP really doesn't provide you an elegant way of handling this. Without meaning to start a language flamewar, I'm going to gingerly suggest that your design skills and needs have probably exceeded the limitations of your tool. PHP is a lightweight scripting language that's had a lot of pseudo-OOP features bolted onto it, but at its core, it wasn't ever designed for elegant enterprise architecture.
来源：https://stackoverflow.com/questions/2528671/php-friend-classes-and-ungreedy-caller-function-class