Magic Constants

Date Added: 14/01/2015

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 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. The class name includes the namespace it was declared in (e.g. Foo\Bar). Note that as of PHP 5.4 __CLASS__ works also in traits. When used in a trait method, __CLASS__ is the name of the class the trait is used in.
`__TRAIT__`	The trait name. (Added in PHP 5.4.0) As of PHP 5.4 this constant returns the trait as it was declared (case-sensitive). The trait name includes the namespace it was declared in (e.g. Foo\Bar).
`__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).