PHP magic constant

& Lt ;? Php/******** // *** note part magic constant 1: Unable to manually modify its value, so it is called constant 2: however, the value changes with the environment, so the Magic --- magic constant _ FILE _ returns the path of the current FILE. in the framework development or website initialization script, used to calculate the website... syntaxHighlighter. all /****
****/
 
 
/***
=== Note ====
Magic constant
 
1: The value cannot be manually modified, so it is called a constant.
2: But the value changes with the environment, so it is called Magic
 
--- Magic constant
_ FILE _ return the path of the current FILE.
Used to calculate the root directory of a website in framework development or website initialization scripts
 
_ LINE _ returns the current row number.
In the framework, it can be used to record error information during debugging.
 
 
 
_ CLASS _ returns the current CLASS name
 
_ METHOD _ returns the current METHOD name.
***/
 
 
Echo 'the currently running is ',__ FILE __, 'file ','
';
 
Echo 'current in ',__ DIR __,' Directory
';
 
Echo 'Hi, I am at ',__ LINE __,'
';
Echo 'hello, I am at ',__ LINE __,'
';
Echo 'Hehe, I am at ',__ LINE __,'
';
 
 
Class Human {
Public static function t (){
Echo 'You are running ',__ CLASS __,' CLASS
';
Echo ',__ METHOD __, 'method ';
}
}
 
Human: t ();