Home > Backend Development > PHP Tutorial > Unterminated string constants Several commonly used magic constants in PHP

Unterminated string constants Several commonly used magic constants in PHP

WBOY
Release: 2016-07-29 08:48:07
Original
970 people have browsed it

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, 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)

The above has introduced several commonly used magic constants in PHP, including unterminated string constants. I hope it will be helpful to friends who are interested in PHP tutorials.

Related labels:
source:php.cn
Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
Popular Tutorials
More>
Latest Downloads
More>
Web Effects
Website Source Code
Website Materials
Front End Template