| __LINE__ | The current line number of the file. |
| __FILE__ | The full path and filename of the file. If used inside an include, the name of the included file is returned. Since PHP 4.0.2, __FILE__ always contains an absolute path with symlinks resolved whereas in older versions it contained relative path under some circumstances. |
| __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. (Added in PHP 5.3.0.) |
| __FUNCTION__ | The function name. (Added in PHP 4.3.0) As of PHP 5 this constant returns the function name as it was declared (case-sensitive). In PHP 4 its value is always lowercased. |
| __CLASS__ | The class name. (Added in PHP 4.3.0) As of PHP 5 this constant returns the class name as it was declared (case-sensitive). In PHP 4 its value is always lowercased. |
| __METHOD__ | The class method name. (Added in PHP 5.0.0) The method name is returned as it was declared (case-sensitive). |
| __NAMESPACE__ | The name of the current namespace (case-sensitive). This constant is defined in compile-time (Added in PHP 5.3.0). |
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