ThinkPHP
ThinkPHP系统常量和预定义常量汇总如下：
1.系统常量：
THINK_PATH // ThinkPHP系统目录：
APP_PATH // 当前项目目录
APP_NAME // 当前项目名称
MODULE_NAME //当前模块名称
ACTION_NAME // 当前操作名称
TMPL_PATH // 项目模版目录
LIB_PATH // 项目类库目录
CACHE_PATH // 项目模版缓存目录
CONFIG_PATH //项目配置文件目录
LOG_PATH // 项目日志文件目录
LANG_PATH // 项目语言文件目录
TEMP_PATH //项目临时文件目录
PLUGIN_PATH // 项目插件文件目录
VENDOR_PATH // 第三方类库目录
DATA_PATH // 项目数据文件目录
IS_APACHE // 是否属于 Apache
IS_IIS //是否属于IIS
IS_WIN //是否属于Windows 环境
IS_LINUX //是否属于 Linux 环境
IS_FREEBSD //是否属于 FreeBsd环境
NOW_TIME // 当前时间戳
MEMORY_LIMIT_ON // 是否有内存使用限制
MEMORY_LIMIT_ON // 是否有内存使用限制
OUTPUT_GZIP_ON //是否开启输出压缩
MAGIC_QUOTES_GPC // MAGIC_QUOTES_GPC
THINK_VERSION //ThinkPHP版本号
LANG_SET // 浏览器语言
TEMPLATE_NAME //当前模版名称
TEMPLATE_PATH //当前模版路径
__ROOT__ // 网站根目录地址
__APP__ // 当前项目（入口文件）地址
__URL__ // 当前模块地址
__ACTION__ // 当前操作地址
__SELF__ // 当前 URL 地址
TMPL_FILE_NAME //当前操作的默认模版名（含路径）
WEB_PUBLIC_URL //网站公共目录
APP_PUBLIC_URL //项目公共模版目录
2.预定义常量:
WEB_LOG_ERROR=0 // 错误日志类型
WEB_LOG_DEBUG=1 // 调试日志类型
SQL_LOG_DEBUG=2 // SQL日志类型
SYSTEM_LOG=0 // 系统方式记录日志
MAIL_LOG=1 // 邮件方式记录日志
TCP_LOG=2 // TCP 方式记录日志
FILE_LOG=3 // 文件方式记录日志
DATA_TYPE_OBJ=1 // 对象方式返回
DATA_TYPE_ARRAY=0 // 数组方式返回
URL_COMMON=0 // 普通模式 URL
URL_PATHINFO=1 // PATHINFO URL
URL_REWRITE=2 // REWRITE URL
HAS_ONE=1 // HAS_ONE 关联定义
BELONGS_TO=2 // BELONGS_TO关联定义
HAS_MANY=3 // HAS_MANY关联定义
MANY_TO_MANY=4 // MANY_TO_MANY关联定义
EXISTS_TO_VAILIDATE = 0 // 表单存在字段则验证
MUST_TO_VALIDATE = 1 // 必须验证
VALUE_TO_VAILIDATE = 2 // 表单值不为空则验证
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