该变量在发生错误并且track_errors选项打开(默认为关闭)后才有效。

该变量在发生错误并且track_errors选项打开(默认为关闭)后才有效。的英文翻译

基本释义

• This variable will only be available within the scope in which the error occurred, and only if the track_errors configuration option is turned on (it defaults to off).