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PHP Manual [Predefined Constants]

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PHP Manual || List of Reserved Words

Core Predefined Constants

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)
The operating system PHP was built for.
PHP_OS_FAMILY (string)
The operating system family PHP was built for. One of 'Windows', 'BSD', 'Darwin', 'Solaris', 'Linux' or 'Unknown'. Available as of PHP 7.2.0.
PHP_SAPI (string)
The Server API for this build of PHP. See also php_sapi_name().
PHP_EOL (string)
The correct 'End Of Line' symbol for this platform. Available since PHP 5.0.2
PHP_INT_MAX (integer)
The largest integer supported in this build of PHP. Usually int(2147483647) in 32 bit systems and int(9223372036854775807) in 64 bit systems. Available since PHP 5.0.5
PHP_INT_MIN (integer)
The smallest integer supported in this build of PHP. Usually int(-2147483648) in 32 bit systems and int(-9223372036854775808) in 64 bit systems. Available since PHP 7.0.0. Usually, PHP_INT_MIN === ~PHP_INT_MAX.
PHP_INT_SIZE (integer)
The size of an integer in bytes in this build of PHP. Available since PHP 5.0.5
PHP_FLOAT_DIG (integer)
Number of decimal digits that can be rounded into a float and back without precision loss. Available as of PHP 7.2.0.
PHP_FLOAT_EPSILON (float)
Smallest representable positive number x, so that x + 1.0 != 1.0. Available as of PHP 7.2.0.
PHP_FLOAT_MIN (float)
Smallest representable positive floating point number. If you need the smallest representable negative floating point number, use - PHP_FLOAT_MAX. Available as of PHP 7.2.0.
PHP_FLOAT_MAX (float)
Largest representable floating point number. Available as of PHP 7.2.0.
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.
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).
PHP_FD_SETSIZE (string)
The maximum number of file descriptors for select system calls. Available as of PHP 7.1.0.
E_ERROR (integer)
Error reporting constant
E_WARNING (integer)
Error reporting constant
E_PARSE (integer)
Error reporting constant
E_NOTICE (integer)
Error reporting constant
E_CORE_ERROR (integer)
Error reporting constant
E_CORE_WARNING (integer)
Error reporting constant
E_COMPILE_ERROR (integer)
Error reporting constant
E_COMPILE_WARNING (integer)
Error reporting constant
E_USER_ERROR (integer)
Error reporting constant
E_USER_WARNING (integer)
Error reporting constant
E_USER_NOTICE (integer)
Error reporting constant
E_RECOVERABLE_ERROR (integer)
Error reporting constant. Available since PHP 5.2.0
E_DEPRECATED (integer)
Error reporting constant. Available since PHP 5.3.0
E_USER_DEPRECATED (integer)
Error reporting constant. Available since PHP 5.3.0
E_ALL (integer)
Error reporting constant
E_STRICT (integer)
Error reporting constant
__COMPILER_HALT_OFFSET__ (integer)
Available since PHP 5.1.0
TRUE (boolean)
See Booleans.
FALSE (boolean)
See Booleans.
NULL (null)
See Null.
PHP_WINDOWS_EVENT_CTRL_C (integer)
A Windows CTRL+C event. Available as of PHP 7.4.0 (Windows only).
PHP_WINDOWS_EVENT_CTRL_BREAK (integer)
A Windows CTRL+BREAK event. Available as of PHP 7.4.0 (Windows only).

See also: Magic constants.

Standard Predefined Constants

All constants from core extensions are defined in PHP by default.



PHP Manual || List of Reserved Words