Predefined Constants (original) (raw)

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.

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.