定義済み定数
PHP Manual

Win32Service サービスエラー制御定数
定数 説明
WIN32_SERVICE_ERROR_IGNORE 0x00000000 The startup program ignores the error and continues the startup operation.
WIN32_SERVICE_ERROR_NORMAL 0x00000001 The startup program logs the error in the event log but continues the startup operation.

定義済み定数
PHP Manual