问题描述
我只是从PHP的基本概念OO开始，
I'm just starting out with the basic concepts OO in PHP,
Foo.php
class Foo extends Command {
public function __construct()
{
parent::__construct();
}
public function fire()
{
$bar = new Bar();
}
}
Bar.php
class Bar extends Foo {
public function __construct()
{
parent::__construct();
$this->info('Bar');
}
}
当我运行 Foo :: fire()时，它给出:对未定义方法Foo :: __ construct()的调用.但是 Foo 显然有一个构造函数，我在做什么错了?
When I run Foo::fire() it gives: Call to undefined method Foo::__construct(). But Foo clearly has a constructor, what am I doing wrong?
我怀疑的另一件事是，这可能是Laravel问题，而不是PHP.这是我创建的 artisan 命令.
Another thing I suspect is that it might be a Laravel problem rather than PHP. This is an artisan command that I created.
也可以在 Bar 中的任何地方调用 $ this-> info('Bar')，也会在非-对象.为什么我不能从子类中调用父方法?
Also calling $this->info('Bar') anywhere in Bar will also give Call to a member function writeln() on a non-object. Why can't I call a parent's method from the child class?
推荐答案
我也遇到了这个问题，并且感到Marcin的反馈是冷漠无助的，尤其是在他的评论中.为此，我很高兴对您和其他在此问题上迷路的人作出答复.
I also ran into this issue, and felt Marcin's feedback to be cold and unhelpful, especially in his comments. For that I am happy to respond with this answer to you and anyone else who stumbles on this problem.
在原始班级Bar:
class Bar extends Foo {
public function __construct()
{
parent::__construct();
$this->info('Bar');
}
}
我只需要设置'output'的属性，如下所示:
I just needed to set the property of 'output' like the following:
class Bar extends Foo {
public function __construct()
{
parent::__construct();
$this->output = new Symfony\Component\Console\Output\ConsoleOutput();
$this->info('Bar');
}
}
希望这会有所帮助！
这篇关于Laravel命令无法在子类中调用$ this-> info()的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！