在我的项目中，我在很多不同的地方都有回声。编辑所有这些都是很痛苦的。我希望在回显之前添加[CLASSNAME / FILENAME / FILEPATH]，例如：
回显结果：现在：
message: test1, asd!
error: file does not exist!
之后：
[SuperClass] message: test1, asd!
[OtherClass] error: file does not exist!
（（如果无法使用类名的方式（静态转换），我想在使用回声的情况下使用文件名或文件路径）
对于class是：
__CLASS__
The class name. The class name includes the namespace it was declared in (e.g. Foo\Bar). Note that as of PHP 5.4 __CLASS__ works also in traits. When used in a trait method, __CLASS__ is the name of the class the trait is used in.
对于文件是：
__FILE__
The full path and filename of the file with symlinks resolved. If used inside an include, the name of the included file is returned.
对于路径：
__DIR__
The directory of the file. If used inside an include, the directory of the included file is returned. This is equivalent to dirname(__FILE__). This directory name does not have a trailing slash unless it is the root directory.
这是一个示例，说明如何使用魔术常数包含类而不在每个回显中写入每个类：
echo “[”.__CLASS__.”] message: test1, asd!”