Resources I use regularly for Web and iOS development. It is by no means complete but I visit most of these on a regular basis. Hope it helps and feel free to share (and share your own!):

General Development Resources

Objecive C
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http://www.objc.io/ - Objective C periodical about best practice with understandable guides and samples

https://www.cocoacontrols.com/ - A wealth of open source iOS controls ready to use in your apps

http://benscheirman.com/2013/08/the-ios-developers-toolbelt/ - A nice reference post to make sure you are using the right iOS tool for the job.

http://reddit.com/r/ios - All things iOS (not just development)

http://reddit.com/r/iOSProgramming/ - Sometimes some useful iOS programming hints in here

http://cocoapods.org/ - A wealth of open source libraries and frameworks ready to use in your apps

http://cocoadocs.org/ - Documentation for all of the above

http://bpoplauschi.wordpress.com/2013/11/06/worthy-ios-libraries/ - List of useful iOS libraries

Web and PHP
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http://devdocs.io/ - A unified development doc set for just about every web related language - need a function definition - look here!

https://github.com/ziadoz/awesome-php - A nice GIT repo of the best PHP frameworks to use as part of your projects

http://phptrends.com/ - Follow trends for popular PHP frameworks to know the latest and greatest tool for the job.

http://reddit.com/r/php - A nice subreddit dedicated to PHP development

http://felixniklas.com/dimensions/ - A tool to help measure elements on web pages.

General
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http://stackoverflow.com/ - No explanation required.

http://news.ycombinator.com/ - Hacker news - a good resource for learning about new technologies and frameworks