   #PHP Manual Constants Constants Expressions

            PHP Manual
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Predefined constants

   PHP provides a large number of predefined constants to any script
   which it runs. Many of these constants, however, are created by
   various extensions, and will only be present when those extensions are
   available, either via dynamic loading or because they have been
   compiled in.

   There are five magical constants that change depending on where they
   are used. For example, the value of __LINE__ depends on the line that
   it's used on in your script. These special constants are
   case-insensitive and are as follows:

   Table 8-1. A few "magical" PHP constants
   Name         Description
   __LINE__     The current line number of the file.
   __FILE__     The full path and filename of the file.
   __FUNCTION__ The function name. (This was added in PHP 4.3.0.)
   __CLASS__    The class name. (This was added in PHP 4.3.0.)
   __METHOD__   The class method name. (This was added in PHP 5.0.0)

   A list of predefined constants is available in the reserved predefined
   constants section.
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