问题描述
在下面的PHP代码中，我想将Foo类中的__CLASS__魔术常数替换为函数__X__()(或类似的东西)，以便从实例中调用方法hello()时<Bar类的c4>，它显示hello from Bar(而不是hello from Foo).我想这样做而不覆盖Bar内部的hello().
In the following PHP code I would like to replace the __CLASS__ magic constant in the Foo class with a function __X__() (or something similar) so that when the method hello() is called from an instance $bar of the Bar class, it prints hello from Bar (instead of hello from Foo). And I want to do thiswithout overriding hello() inside Bar.
所以基本上，我想要一个__CLASS__的版本，该版本在运行时而不是在编译时动态绑定.
So basically, I want a version of __CLASS__ that binds dynamically at run-time rather than at compile-time.
class Foo {
public function hello() {
echo "hello from " . __CLASS__ . "\n";
}
}
class Bar extends Foo {
public function world() {
echo "world from " . __CLASS__ . "\n";
}
}
$bar = new Bar();
$bar->hello();
$bar->world();
输出:
hello from Foo
world from Bar
我想要此输出(不覆盖Bar中的hello()):
I WANT THIS OUTPUT (without overriding hello() inside Bar):
hello from Bar
world from Bar
推荐答案
您可以简单地使用 get_class() ，就像这样:
You could simple use get_class(), like this:
echo "hello from " . get_class($this) . "\n";
echo "world from " . get_class($this) . "\n";
输出:
hello from Bar
world from Bar
这篇关于在运行时而不是编译时绑定的__CLASS__的版本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！