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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) -
PHP_OS(string) -
PHP_SAPI(string) - Available since PHP 4.2.0. See also php_sapi_name().
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PHP_EOL(string) - Available since PHP 4.3.10 and PHP 5.0.2
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PHP_INT_MAX(integer) - Available since PHP 4.4.0 and PHP 5.0.5
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PHP_INT_SIZE(integer) - Available since PHP 4.4.0 and PHP 5.0.5
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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
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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
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PHP_OUTPUT_HANDLER_START(integer) -
PHP_OUTPUT_HANDLER_CONT(integer) -
PHP_OUTPUT_HANDLER_END(integer) -
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_ALL(integer) -
E_STRICT(integer) - Available since PHP 5.0.0
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__COMPILER_HALT_OFFSET__(integer) - Available since PHP 5.1.0
See also: Magic constants.
These constants are defined in PHP by default.
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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)