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PHP魔术常量

  1. /**** 
  2. 燕十八 公益PHP讲堂 
  3.  
  4. 论  坛: http://www.zixue.it 
  5. 微  博: http://weibo.com/Yshiba 
  6. YY频道: 88354001 
  7. ****/  
  8.   
  9.   
  10. /*** 
  11. ====笔记部分==== 
  12. 魔术常量 
  13.  
  14. 1:无法手动修改他的值,所以叫常量 
  15. 2:但是值又是随环境变动的,所以叫魔术 
  16.  
  17. ---魔术常量 
  18. __FILE__  返回当前文件的路径. 
  19. 在框架开发或者是网站初始化脚本中,用来计算网站的根目录 
  20.  
  21. __LINE__  返回当前的行号 
  22. 在框架中,可以用来在debug时,记录错误信息 
  23.  
  24.  
  25.  
  26. __CLASS__ 返回当前的类名 
  27.  
  28. __METHOD__ 返回当前的方法名 
  29. ***/  
  30.   
  31.   
  32. echo '当前正在运行的是',__FILE__,'文件','
    '
    ;  
  33.   
  34. echo '当前在',__DIR__,'目录下
    '
    ;  
  35.   
  36. echo 'hi,我在',__LINE__,'行
    '
    ;  
  37. echo 'hello,我在',__LINE__,'行
    '
    ;  
  38. echo 'hehe,我在',__LINE__,'行
    '
    ;  
  39.   
  40.   
  41. class Human {  
  42.     public static function t() {  
  43.         echo '你正在运行',__CLASS__,'类
    '
    ;  
  44.         echo '下的',__METHOD__,'方法';  
  45.     }  
  46. }  
  47.   
  48. Human::t();  
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