PHP_VERSION (string) 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) 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 __COMPILER_HALT_OFFSET__ (integer) Available since PHP 5.1.0