Why Wi-Fi is getting turned-on automatically in iOS 11 [duplicate]

I am using iOS 11 in iPhone 5S but its wi-fi is getting turned-on automatically, is there any way to stop it.

Solution 1:

Source:

Beginning in iOS 11, the system will automatically try and reconnect to known devices using Bluetooth and Wi-Fi at 5am every morning (local time) if they have only been toggled off using the Control Center.

You 'fix' this behaviour by turning both radios off inside of `Settings' (depending on your device locale and language, "Wi-Fi" might also be named "WLAN" as in the pictures below):

1. Open Settings -> Wi-Fi.
2. Switch the Wi-Fi radio button to off.