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预定义常量

内核预定义常量

这些常量在 PHP 的内核中定义。它包含 PHP、Zend 引擎和 SAPI 模块。

PHP_VERSION (string)
PHP_OS (string)
PHP_SAPI (string)
自 PHP 4.2.0 起可用。参见 php_sapi_name()
PHP_EOL (string)
自 PHP 4.3.10 和 PHP 5.0.2 起可用
PHP_INT_MAX (integer)
自 PHP 4.4.0 和 PHP 5.0.5 起可用
PHP_INT_SIZE (integer)
自 PHP 4.4.0 和 PHP 5.0.5 起可用
DEFAULT_INCLUDE_PATH (string)
PEAR_INSTALL_DIR (string)
PEAR_EXTENSION_DIR (string)
PHP_EXTENSION_DIR (string)
PHP_PREFIX (string)
自 PHP 4.3.0 起可用
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)
自 PHP 4.3.0 起可用
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)
从 PHP 5.0.0 起有效
__COMPILER_HALT_OFFSET__ (integer)
自 PHP 5.1.0 起有效

参见魔术常量

标准预定义常量

这些常量是 PHP 默认定义的。

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)

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用户评论:

Volker (2013-06-28 14:08:33)

simple check for current OS:

<?php

class System {

    const 
OS_UNKNWON 1;
    const 
OS_WIN 2;
    const 
OS_LINUX 3;
    const 
OS_OSX 4;

    
/**
     * @return int
     */
    
static public function getOS() {
        switch (
true) {
            case 
stristr(PHP_OS'WIN'): return self::OS_WIN;
            case 
stristr(PHP_OS'DAR'): return self::OS_OSX;
            case 
stristr(PHP_OS'LINUX'): return self::OS_LINUX;
            default : return 
self::OS_UNKNWON;
        }
    }

}

?>

j dot westfield at pmtsolutions dot eu (2013-06-14 10:38:44)

I am using PHP version 5.2.14, and PHP_OS is empty on my Windows / Apache - Setup.
Any notes on this? Many thanks.

Yousha dot A at Hotmail dot com (2013-02-01 18:44:39)

PHP_EOL replacement for PHP < 5.0.2 :

<?php

# PHP < 5.0.2
if(!defined('PHP_EOL'))
{
    if(
stristr(PHP_OS'WIN')) define('PHP_EOL'"\r\n");
    elseif(
stristr(PHP_OS'DAR')) define('PHP_EOL'"\r");
    else 
define('PHP_EOL'"\n");
}

?>

soywiz at gmail dot com (2009-01-19 03:32:39)

Another way to determine PHP_INT_MIN:

<?php
define
('PHP_INT_MIN', ~PHP_INT_MAX);
?>

It should work always:

MAX for 8bit-signed: 01111111
MIN for 8bit-signed: 10000000

In 32 bits:
php -r"echo (int)base_convert(str_repeat('1', 31), 2, 10) - PHP_INT_MAX;"
0
<?php echo ~(int)base_convert(str_repeat('1'31), 210); ?>
-2147483648

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