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Predefined Constants
Core Predefined Constants
These constants are defined by the PHP core. This includes PHP,
the Zend engine, and SAPI modules.
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PHP_VERSION
(string)
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The current PHP version as a string in
"major.minor.release[extra]" notation.
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PHP_MAJOR_VERSION
(integer)
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The current PHP "major" version as an integer (e.g., int(5)
from version "5.2.7-extra"). Available since PHP 5.2.7.
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PHP_MINOR_VERSION
(integer)
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The current PHP "minor" version as an integer (e.g., int(2)
from version "5.2.7-extra"). Available since PHP 5.2.7.
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PHP_RELEASE_VERSION
(integer)
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The current PHP "release" version as an integer (e.g., int(7)
from version "5.2.7-extra"). Available since PHP 5.2.7.
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PHP_VERSION_ID
(integer)
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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.
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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.
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PHP_ZTS
(integer)
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Available since PHP 5.2.7.
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PHP_DEBUG
(integer)
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Available since PHP 5.2.7.
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PHP_MAXPATHLEN
(integer)
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The maximum length of filenames (including path) supported
by this build of PHP. Available since PHP 5.3.0.
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PHP_OS
(string)
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The operating system PHP was built for.
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PHP_OS_FAMILY
(string)
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The operating system family PHP was built for. Either of
'Windows', 'BSD',
'OSX', 'Solaris',
'Linux' or 'Unknown'.
Available as of PHP 7.2.0.
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PHP_SAPI
(string)
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The Server API for this build of PHP.
See also php_sapi_name.
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PHP_EOL
(string)
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The correct 'End Of Line' symbol for this platform.
Available since PHP 5.0.2
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PHP_INT_MAX
(integer)
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The largest integer supported in this build of PHP. Usually int(2147483647).
Available since PHP 5.0.5
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PHP_INT_MIN
(integer)
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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.
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PHP_INT_SIZE
(integer)
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The size of an integer in bytes in this build of PHP. Available since PHP 5.0.5
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PHP_FLOAT_DIG
(integer)
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Number of decimal digits that can be rounded into a float and back
without precision loss.
Available as of PHP 7.2.0.
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PHP_FLOAT_EPSILON
(float)
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Smallest representable positive number x, so that x + 1.0 !=
1.0.
Available as of PHP 7.2.0.
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PHP_FLOAT_MIN
(float)
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Smallest representable floating point number.
Available as of PHP 7.2.0.
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PHP_FLOAT_MAX
(float)
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Largest representable floating point number.
Available as of PHP 7.2.0.
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DEFAULT_INCLUDE_PATH
(string)
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PEAR_INSTALL_DIR
(string)
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PEAR_EXTENSION_DIR
(string)
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PHP_EXTENSION_DIR
(string)
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PHP_PREFIX
(string)
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The value "--prefix" was set to at configure.
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PHP_BINDIR
(string)
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Specifies where the binaries were installed into.
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PHP_BINARY
(string)
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Specifies the PHP binary path during script execution.
Available since PHP 5.4.
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PHP_MANDIR
(string)
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Specifies where the manpages were installed into.
Available since PHP 5.3.7.
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PHP_LIBDIR
(string)
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PHP_DATADIR
(string)
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PHP_SYSCONFDIR
(string)
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PHP_LOCALSTATEDIR
(string)
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PHP_CONFIG_FILE_PATH
(string)
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PHP_CONFIG_FILE_SCAN_DIR
(string)
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PHP_SHLIB_SUFFIX
(string)
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The build-platform's shared library suffix, such as "so" (most Unixes)
or "dll" (Windows).
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PHP_FD_SETSIZE
(string)
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The maximum number of file descriptors for select system calls. Available
as of PHP 7.1.0.
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E_ERROR
(integer)
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Error reporting constant
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E_WARNING
(integer)
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E_PARSE
(integer)
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E_NOTICE
(integer)
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E_CORE_ERROR
(integer)
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E_CORE_WARNING
(integer)
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E_COMPILE_ERROR
(integer)
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E_COMPILE_WARNING
(integer)
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E_USER_ERROR
(integer)
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E_USER_WARNING
(integer)
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E_USER_NOTICE
(integer)
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E_DEPRECATED
(integer)
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Available since PHP 5.3.0
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E_USER_DEPRECATED
(integer)
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Available since PHP 5.3.0
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E_ALL
(integer)
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E_STRICT
(integer)
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__COMPILER_HALT_OFFSET__
(integer)
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Available since PHP 5.1.0
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TRUE
(boolean)
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See Booleans.
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FALSE
(boolean)
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See Booleans.
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NULL
(null)
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See Null.
See also: Magic
constants.
Standard Predefined Constants
All constants from core
extensions are defined in PHP by default.
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