Several commonly used magic constants in PHP_PHP tutorial

There are seven magic constants whose values ​​change depending on their location in the code. For example, the value of __LINE__ depends on the line it is in the script. These special constants are not case-sensitive and are as follows:

Name	Description
__LINE__	The current line number in the file.
__FILE__	The full path and file name of the file. If used within an included file, returns the name of the included file. Since PHP 4.0.2, __FILE__ always contains an absolute path (or the resolved absolute path in the case of a symbolic link), while versions before that sometimes contained A relative path.
__DIR__	The directory where the file is located. If used within an included file, returns the directory where the included file is located. It is equivalent to dirname(__FILE__). Directory names do not include the trailing slash unless they are the root directory.(New in PHP 5.3.0) =
__FUNCTION__	Function name (new in PHP 4.3.0). Since PHP 5 this constant returns the name of the function as it was defined (case sensitive). In PHP 4 this value is always lowercase.
__CLASS__	The name of the class (new in PHP 4.3.0). Since PHP 5 this constant returns the name of the class when it was defined (case sensitive). In PHP 4 this value is always lowercase.
__METHOD__	The method name of the class (newly added in PHP 5.0.0). Returns the name of the method as it was defined (case-sensitive).
__NAMESPACE__	The name of the current namespace (case sensitive). This constant is defined at compile time (new in PHP 5.3.0)

http://www.bkjia.com/PHPjc/325128.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/325128.htmlTechArticleThere are seven magic constants whose values ​​change as their position in the code changes. For example, the value of __LINE__ depends on the line it is in the script. These special constants do not differentiate...