Update from 1.6.1 to 2.1.4 : necessary code changes?

[eluser]Unknown[/eluser]
Hello,

I am using an application written on CI 1.6.1 and it partially stopped working since my hosting provider upgraded to PHP 5.3.26 (generates 500 or 503 server errors).

searching around the net, I realized in addition to the library itself, some parts of application code need to be changed as well. for example:

Code:

parent::Controller();  --->  parent::__construct();

Can you please provide a full list of these necessary changes that I need to make in order to get the app running again?

the application I'm talking about can be found here:
https://github.com/yongfook/sweetcron

Thanks for your time.

[eluser]Syllean[/eluser]
http://ellislab.com/codeigniter/user-gui...ading.html

[eluser]Unknown[/eluser]
[quote author="Syllean" date="1375664085"]http://ellislab.com/codeigniter/user-guide/installation/upgrading.html[/quote]

thanks Syllean, but I already have read that articles. they only talk about upgrading the CI Core, nothing is mentioned about application code, or deprecated and replaced functions... any other suggestions?