Magic constants /Core Predefined Constants

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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 todirname(__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).

These constants are defined by the PHP core. This includes PHP, the Zend engine, and SAPI modules.

PHP_VERSION (string)

The current PHP version as a string in "major.minor.release[extra]" notation.

PHP_MAJOR_VERSION (integer)

The current PHP "major" version as an integer (e.g., int(5) from version "5.2.7-extra"). Available since PHP 5.2.7.

PHP_MINOR_VERSION (integer)

The current PHP "minor" version as an integer (e.g., int(2) from version "5.2.7-extra"). Available since PHP 5.2.7.

PHP_RELEASE_VERSION (integer)

The current PHP "release" version as an integer (e.g., int(7) from version "5.2.7-extra"). Available since PHP 5.2.7.

PHP_VERSION_ID (integer)

The current PHP version as an integer, useful for version comparisons (e.g., int(50207) from version "5.2.7-extra"). Available since PHP 5.2.7.

PHP_EXTRA_VERSION (string)

The current PHP "extra" version as a string (e.g., '-extra' from version "5.2.7-extra"). Often used by distribution vendors to indicate a package version. Available since PHP 5.2.7.

PHP_ZTS (integer)

Available since PHP 5.2.7.

PHP_DEBUG (integer)

Available since PHP 5.2.7.

PHP_MAXPATHLEN (integer)

The maximum length of filenames (including path) supported by this build of PHP. Available since PHP 5.3.0.

PHP_OS (string)

PHP_SAPI (string)

The Server API for this build of PHP. Available since PHP 4.2.0. See also php_sapi_name().

PHP_EOL (string)

The correct 'End Of Line' symbol for this platform. Available since PHP 4.3.10 and PHP 5.0.2

PHP_INT_MAX (integer)

The largest integer supported in this build of PHP. Usually int(2147483647). Available since PHP 4.4.0 and PHP 5.0.5

PHP_INT_SIZE (integer)

Available since PHP 4.4.0 and PHP 5.0.5

DEFAULT_INCLUDE_PATH (string)

PEAR_INSTALL_DIR (string)

PEAR_EXTENSION_DIR (string)

PHP_EXTENSION_DIR (string)

PHP_PREFIX (string)

The value "--prefix" was set to at configure. Available since PHP 4.3.0.

PHP_BINDIR (string)

Specifies where the binaries were installed into.

PHP_BINARY (string)

Specifies the PHP binary path during script execution. Available since PHP 5.4.

PHP_MANDIR (string)

Specifies where the manpages were installed into. Available since PHP 5.3.7.

PHP_LIBDIR (string)

PHP_DATADIR (string)

PHP_SYSCONFDIR (string)

PHP_LOCALSTATEDIR (string)

PHP_CONFIG_FILE_PATH (string)

PHP_CONFIG_FILE_SCAN_DIR (string)

PHP_SHLIB_SUFFIX (string)

The build-platform's shared library suffix, such as "so" (most Unixes) or "dll" (Windows). Available since PHP 4.3.0

E_ERROR (integer)

Error reporting constant

E_WARNING (integer)

E_PARSE (integer)

E_NOTICE (integer)

E_CORE_ERROR (integer)

E_CORE_WARNING (integer)

E_COMPILE_ERROR (integer)

E_COMPILE_WARNING (integer)

E_USER_ERROR (integer)

E_USER_WARNING (integer)

E_USER_NOTICE (integer)

E_DEPRECATED (integer)

Available since PHP 5.3.0

E_USER_DEPRECATED (integer)

Available since PHP 5.3.0

E_ALL (integer)

E_STRICT (integer)

Available since PHP 5.0.0

__COMPILER_HALT_OFFSET__ (integer)

Available since PHP 5.1.0

TRUE (boolean)

See Booleans.

FALSE (boolean)

See Booleans.

NULL (boolean)

See Null.

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