PHP Predefined Constants

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<?php
// *nix
echo DIRECTORY_SEPARATOR; // /
echo PHP_SHLIB_SUFFIX;  // so
echo PATH_SEPARATOR;   // :


// Win*
echo DIRECTORY_SEPARATOR; // \
echo PHP_SHLIB_SUFFIX;  // dll
echo PATH_SEPARATOR;   // ;
?>



Predefined Constants
Core Predefined Constants
These constants are defined by the PHP core. This includes PHP, the Zend engine, and SAPI modules.
PHP_VERSION (string) PHP_MAJOR_VERSION (integer) Available since PHP 5.2.7. PHP_MINOR_VERSION (integer) Available since PHP 5.2.7. PHP_RELEASE_VERSION (integer) Available since PHP 5.2.7. PHP_VERSION_ID (integer) Available since PHP 5.2.7. PHP_EXTRA_VERSION (string) 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) Available since PHP 5.3.0. PHP_OS (string) PHP_SAPI (string) Available since PHP 4.2.0. See also php_sapi_name(). PHP_EOL (string) Available since PHP 4.3.10 and PHP 5.0.2 PHP_INT_MAX (integer) 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) Available since PHP 4.3.0 PHP_BINDIR (string) 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) Available since PHP 4.3.0 PHP_OUTPUT_HANDLER_START (integer) PHP_OUTPUT_HANDLER_CONT (integer) PHP_OUTPUT_HANDLER_END (integer) PHP_WINDOWS_VERSION_MAJOR (integer) Available since PHP 5.3.0 PHP_WINDOWS_VERSION_MINOR (integer) Available since PHP 5.3.0 PHP_WINDOWS_VERSION_BUILD (integer) Available since PHP 5.3.0 PHP_WINDOWS_VERSION_PLATFORM (integer) Available since PHP 5.3.0 PHP_WINDOWS_VERSION_SP_MAJOR (integer) Available since PHP 5.3.0 PHP_WINDOWS_VERSION_SP_MINOR (integer) Available since PHP 5.3.0 PHP_WINDOWS_VERSION_SUITEMASK (integer) Available since PHP 5.3.0 PHP_WINDOWS_VERSION_PRODUCTTYPE (integer) Available since PHP 5.3.0 PHP_WINDOWS_NT_DOMAIN_CONTROLLER (integer) Available since PHP 5.3.0 PHP_WINDOWS_NT_SERVER (integer) Available since PHP 5.3.0 PHP_WINDOWS_NT_WORKSTATION (integer) Available since PHP 5.3.0 E_ERROR (integer) 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. See also: Magic constants.

Standard Predefined Constants
These constants are defined in PHP by default.
EXTR_OVERWRITE (integer) EXTR_SKIP (integer) EXTR_PREFIX_SAME (integer) EXTR_PREFIX_ALL (integer) EXTR_PREFIX_INVALID (integer) EXTR_PREFIX_IF_EXISTS (integer) EXTR_IF_EXISTS (integer) SORT_ASC (integer) SORT_DESC (integer) SORT_REGULAR (integer) SORT_NUMERIC (integer) SORT_STRING (integer) CASE_LOWER (integer) CASE_UPPER (integer) COUNT_NORMAL (integer) COUNT_RECURSIVE (integer) ASSERT_ACTIVE (integer) ASSERT_CALLBACK (integer) ASSERT_BAIL (integer) ASSERT_WARNING (integer) ASSERT_QUIET_EVAL (integer) CONNECTION_ABORTED (integer) CONNECTION_NORMAL (integer) CONNECTION_TIMEOUT (integer) INI_USER (integer) INI_PERDIR (integer) INI_SYSTEM (integer) INI_ALL (integer) M_E (float) M_LOG2E (float) M_LOG10E (float) M_LN2 (float) M_LN10 (float) M_PI (float) M_PI_2 (float) M_PI_4 (float) M_1_PI (float) M_2_PI (float) M_2_SQRTPI (float) M_SQRT2 (float) M_SQRT1_2 (float) CRYPT_SALT_LENGTH (integer) CRYPT_STD_DES (integer) CRYPT_EXT_DES (integer) CRYPT_MD5 (integer) CRYPT_BLOWFISH (integer) DIRECTORY_SEPARATOR (string) SEEK_SET (integer) SEEK_CUR (integer) SEEK_END (integer) LOCK_SH (integer) LOCK_EX (integer) LOCK_UN (integer) LOCK_NB (integer) HTML_SPECIALCHARS (integer) HTML_ENTITIES (integer) ENT_COMPAT (integer) ENT_QUOTES (integer) ENT_NOQUOTES (integer) INFO_GENERAL (integer) INFO_CREDITS (integer) INFO_CONFIGURATION (integer) INFO_MODULES (integer) INFO_ENVIRONMENT (integer) INFO_VARIABLES (integer) INFO_LICENSE (integer) INFO_ALL (integer) CREDITS_GROUP (integer) CREDITS_GENERAL (integer) CREDITS_SAPI (integer) CREDITS_MODULES (integer) CREDITS_DOCS (integer) CREDITS_FULLPAGE (integer) CREDITS_QA (integer) CREDITS_ALL (integer) STR_PAD_LEFT (integer) STR_PAD_RIGHT (integer) STR_PAD_BOTH (integer) PATHINFO_DIRNAME (integer) PATHINFO_BASENAME (integer) PATHINFO_EXTENSION (integer) PATH_SEPARATOR (string) CHAR_MAX (integer) LC_CTYPE (integer) LC_NUMERIC (integer) LC_TIME (integer) LC_COLLATE (integer) LC_MONETARY (integer) LC_ALL (integer) LC_MESSAGES (integer) ABDAY_1 (integer) ABDAY_2 (integer) ABDAY_3 (integer) ABDAY_4 (integer) ABDAY_5 (integer) ABDAY_6 (integer) ABDAY_7 (integer) DAY_1 (integer) DAY_2 (integer) DAY_3 (integer) DAY_4 (integer) DAY_5 (integer) DAY_6 (integer) DAY_7 (integer) ABMON_1 (integer) ABMON_2 (integer) ABMON_3 (integer) ABMON_4 (integer) ABMON_5 (integer) ABMON_6 (integer) ABMON_7 (integer) ABMON_8 (integer) ABMON_9 (integer) ABMON_10 (integer) ABMON_11 (integer) ABMON_12 (integer) MON_1 (integer) MON_2 (integer) MON_3 (integer) MON_4 (integer) MON_5 (integer) MON_6 (integer) MON_7 (integer) MON_8 (integer) MON_9 (integer) MON_10 (integer) MON_11 (integer) MON_12 (integer) AM_STR (integer) PM_STR (integer) D_T_FMT (integer) D_FMT (integer) T_FMT (integer) T_FMT_AMPM (integer) ERA (integer) ERA_YEAR (integer) ERA_D_T_FMT (integer) ERA_D_FMT (integer) ERA_T_FMT (integer) ALT_DIGITS (integer) INT_CURR_SYMBOL (integer) CURRENCY_SYMBOL (integer) CRNCYSTR (integer) MON_DECIMAL_POINT (integer) MON_THOUSANDS_SEP (integer) MON_GROUPING (integer) POSITIVE_SIGN (integer) NEGATIVE_SIGN (integer) INT_FRAC_DIGITS (integer) FRAC_DIGITS (integer) P_CS_PRECEDES (integer) P_SEP_BY_SPACE (integer) N_CS_PRECEDES (integer) N_SEP_BY_SPACE (integer) P_SIGN_POSN (integer) N_SIGN_POSN (integer) DECIMAL_POINT (integer) RADIXCHAR (integer) THOUSANDS_SEP (integer) THOUSEP (integer) GROUPING (integer) YESEXPR (integer) NOEXPR (integer) YESSTR (integer) NOSTR (integer) CODESET (integer) LOG_EMERG (integer) LOG_ALERT (integer) LOG_CRIT (integer) LOG_ERR (integer) LOG_WARNING (integer) LOG_NOTICE (integer) LOG_INFO (integer) LOG_DEBUG (integer) LOG_KERN (integer) LOG_USER (integer) LOG_MAIL (integer) LOG_DAEMON (integer) LOG_AUTH (integer) LOG_SYSLOG (integer) LOG_LPR (integer) LOG_NEWS (integer) LOG_UUCP (integer) LOG_CRON (integer) LOG_AUTHPRIV (integer) LOG_LOCAL0 (integer) LOG_LOCAL1 (integer) LOG_LOCAL2 (integer) LOG_LOCAL3 (integer) LOG_LOCAL4 (integer) LOG_LOCAL5 (integer) LOG_LOCAL6 (integer) LOG_LOCAL7 (integer) LOG_PID (integer) LOG_CONS (integer) LOG_ODELAY (integer) LOG_NDELAY (integer) LOG_NOWAIT (integer) LOG_PERROR (integer)