A few "magical" PHP constants

Name Description

__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 a absolute path with symlinks resolved whereas in older versions it contained r Elative 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 has 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 is declared (case-sensitive). In PHP 4 It 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 is declared (case-sensitive). In PHP 4 It 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 was defined in Compile-time (Added in PHP 5.3.0).

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