The Official source of PHP:
PHP.net http://php.net
PHP Manual http://php.net/manual/en in English
ex. Date function http://php.net/manual/en/function.date.php
Developing in the Cloud http://cloudspring.com/11-things-every-developer-should-know-about-the-cloud/?utm_medium=email&utm_campaign=CloudSpring+10th+Jan&utm_content=CloudSpring+10th+Jan+CID_ae978119f98d5098291389f2480b8e9f&utm_source=Newsletter&utm_term=11+Things+Every+Developer+Should+Know+About+The+Cloud
Conferences:
Northeast PHP 2013 Videos from Day 1 - Saturday
"Keynote: Looking to the Past, to Predict the Future" (by Eli White): http://www.youtube.com/watch?v=JDm2HwJDR7g
"Keynote: Looking to the Past, to Predict the Future: Audience Questions" (by Eli White): http://www.youtube.com/watch?v=k0te8YLLDOw
"You Can UX Too: Avoiding the Programmer's User Interface" (by Eryn O'Neil): http://www.youtube.com/watch?v=xm9AdMJgMfA
"How To Get There" (by Larry Ullman): http://www.youtube.com/watch?v=rIMT0Itzrfg
"How and use regular expressions in PHP and why use them" (by Joel Lord): http://www.youtube.com/watch?v=5M1VTOgfiRk
"Mobile-First Design" (by Katelyn Sessions): http://www.youtube.com/watch?v=dVEF2fwHelc
"Agile in the Workplace" (by Michael Stowe): http://www.youtube.com/watch?v=ubDCyyPyJfY
"Don't Be STUPID, Grasp SOLID" (by Anthony Ferrara): http://www.youtube.com/watch?v=z_LxkB-Pgf0
"UI Patterns: A Practical Toolkit" (by Jim O'Neill): http://www.youtube.com/watch?v=h5LpyjMBj_o
"Ajax: You Can Do It Too" (by Larry Ullman): http://www.youtube.com/watch?v=tiHDJg59WvY
"Magic Methods: Spilling the secret" (by Matthew Barlocker): http://www.youtube.com/watch?v=EOVQt4mOFk4
"jQuery Mobile: Sites That Feel Like Apps" (by Anna Filina): http://www.youtube.com/watch?v=QbXuDwwgjlE
"Testing UX Design with Reverse Card Sorting" (by David Kelleher): http://www.youtube.com/watch?v=ffXfXtlQ46U
"Scaling PHP to 40 Million Uniques" (by Jonathan Klein): http://www.youtube.com/watch?v=PEdgo7mcE68
"Designing software for the Agile generation" (by Martin Kemp): http://www.youtube.com/watch?v=Dj9VWJlRdz0
"Team Plaatjes: Building JS Applications with Vector Graphics" (by Ross Tuck): http://www.youtube.com/watch?v=AEFQQvDtZtk
Videos from Day 2 - Sunday
"Package Management in PHP: Better Late than Never!" (by Sequoia McDowell): http://www.youtube.com/watch?v=Lm7K6AbV8SQ
"Cracking the Code of Web Content Development" (by Jason Rubin): http://www.youtube.com/watch?v=F8fM2ZiKsIE
"How to Hire Good Engineers" (by Bryan Healey): http://www.youtube.com/watch?v=hL5lgDYIOZE
"Teaching PHP & Web Development" (by Larry Ullman): http://www.youtube.com/watch?v=ClBoLHnhp14
"Coding the Semantic Web with HTML5" (by David Kelleher): http://www.youtube.com/watch?v=SOnWncxJX6k
"Practical Responsive Web Design" (by Jonathan Klein): http://www.youtube.com/watch?v=S2-pYh2jpjM
"Developing For the Cloud, In The Cloud" (by David Duggins): http://www.youtube.com/watch?v=siO05y8AZ1I
"The UX of URLs" (by Ryan Freebern): http://www.youtube.com/watch?v=pQ811q16x98
"Git Essentials" (by Matthew Barlocker): http://www.youtube.com/watch?v=oSheuUztt58
"Layout on the web" (by Brian Del Giudice): http://www.youtube.com/watch?v=A0SZKMr5X2A
"Berserk for Responsive Design Frameworks!" (by Jen Kramer): http://www.youtube.com/watch?v=ZJdEGoPw0ko
"Building a REST API" (by Michael Stowe): http://www.youtube.com/watch?v=AEEmXWxba2E
"Introduction to User Experience (UX) Design" (by Meghan Reilly): http://www.youtube.com/watch?v=n5ZGB-JhzUg
"Keynote: Ten Evil Things - Features Engineering at Wikipedia" (by Terry Chay): http://www.youtube.com/watch?v=_ToEe6wOG0c
PHP Tutorial Sites:
PHP Master: http://phpmaster.com - has tutorials for Beginning, Intermediate, Advanced & Expert.
PHP can't do everything - sometimes for speed, standards, etc. you need to use another Server Side Language:
NOTE: you have to have this language installed on the server and have it accessible, to the web.
Java
Python
Python Editor - TKinter - Graphical User Interface for Pythom
Perl
C++
Cobol
Assembler