Predefined Constants

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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.

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.
PHP_EXTRA_VERSION (string): 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)
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). 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
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.
PHP_MANDIR (string): Specifies where the manpages were installed into. Available since PHP 5.3.7.
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): The build-platform's shared library suffix, such as "so" (most Unixes) or "dll" (Windows).
E_ERROR (integer): Error reporting constant
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)
__COMPILER_HALT_OFFSET__ (integer): Available since PHP 5.1.0
TRUE (boolean): See Booleans.
FALSE (boolean): See Booleans.
NULL (null): See Null.

Standard Predefined Constants

All constants from core extensions are defined in PHP by default.

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User Contributed Notes 2 notes

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rdcapasso ¶

2 years ago


Volker's getOS() function needs to have the order of cases changed in the switch statement since "darwin" contains "win", which means that both "windows" and "darwin" will return self::OS_WIN. I've moved the 'dar' case above the 'win' case:

<?php
class System {

    const OS_UNKNOWN = 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, 'DAR'): return self::OS_OSX;
            case stristr(PHP_OS, 'WIN'): return self::OS_WIN;
            case stristr(PHP_OS, 'LINUX'): return self::OS_LINUX;
            default : return self::OS_UNKNOWN;
        }
    }

}
?>

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Anonymous ¶

1 year ago


PHP_EOL can be used like that:

<?php

$data = 'some data'.PHP_EOL;
$fp = fopen('somefile', 'a');
fwrite($fp, $data);

?>

Which is the same of \r\n or \n depending on the OS.
You can put those lines in a while for example, and create a log file.

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