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Agile PHP Development Bookshelf
Extreme Programming Explained: Embrace ChangeExtreme Programming Explained: Embrace Change by Kent Beck
Buy new: £16.19 / Used from: £11.95
An essential starting point.
Agile Software Development with SCRUM (Agile Software Development)Agile Software Development with SCRUM (Agile Software Development) by Ken Schwaber
Buy used from: £21.38
Useful introduction to the basics of agile projects.
Essential PHP SecurityEssential PHP Security by Chris Shiflett
Buy new: £13.59 / Used from: £11.34
An essential, if lightweight, security primer that all PHP developers should read.
Advanced PHP Programming (Developer's Library)Advanced PHP Programming (Developer's Library) by George Schlossnagle
Buy new: £21.90 / Used from: £7.99
One of too few good advanced PHP books that get into the technical details.
Working Effectively with Legacy Code (Robert C Martin)Working Effectively with Legacy Code (Robert C Martin) by Michael Feathers
Buy new: £17.99 / Used from: £41.08
Clearly explains the use and usefulness of advanced development techniques.
Agile Estimating and Planning (Robert C. Martin)Agile Estimating and Planning (Robert C. Martin) by Mike Cohn
Buy new: £14.49 / Used from: £13.75
Well written and well-referenced guide that helps demistify one of the trickiest. aspects of software development
JavaScript: The Definitive GuideJavaScript: The Definitive Guide by David Flanagan
Buy new: £23.08 / Used from: £12.18
The only Javascript book that Crockford recommends, an absolute essential for any web2.0 developer.
Test Driven Development (The Addison-Wesley signature series)Test Driven Development (The Addison-Wesley signature series) by Kent Beck
Buy new: £11.49 / Used from: £10.00
Jumps between languages in a somewhat confusing fashion, but still a very good book for TDD.
PHP 5 Objects, Patterns, and PracticePHP 5 Objects, Patterns, and Practice by Matt Zandstra
Buy used from: £11.50
Useful intro to objects & patterns - critically, it's PHP5 only rather than a confusing mix.
The Pragmatic ProgrammerThe Pragmatic Programmer by Andrew Hunt
Buy new: £18.84 / Used from: £12.99
The seminal guide to modern software development. Another good starting point.
Peopleware: Productive Projects and TeamsPeopleware: Productive Projects and Teams by Tom DeMarco
Buy new: £20.99 / Used from: £13.48
Highly authoritative guide to the principles and psychology of development projects and teams.
Joel on Software: And on Diverse and Occasionally Related Matters That Will Prove of Interest to Software Developers, Designers, and Managers, and to Those ... or Ill-Luck, Work with Them in Some CapacityJoel on Software: And on Diverse and Occasionally Related Matters That Will Prove of Interest to Software Developers, Designers, and Managers, and to Those ... or Ill-Luck, Work with Them in Some Capacity by Joel Spolsky
Buy new: £15.50 / Used from: £12.99
Background rather than critical reading, but well worth it.
Smart and Gets Things Done: Joel Spolsky's Concise Guide to Finding the Best Technical Talent, Hardback: Joel Spolsky's Concise Guide to Finding the Best Technical TalentSmart and Gets Things Done: Joel Spolsky's Concise Guide to Finding the Best Technical Talent, Hardback: Joel Spolsky's Concise Guide to Finding the Best Technical Talent by Joel Spolsky
Buy new: £12.34 / Used from: £8.27
Read this before you hire another developer. Sound advice as ever from Joel.
Php|architect's Zend PHP 5 Certification Study GuidePhp|architect's Zend PHP 5 Certification Study Guide by Davey Shafik
Buy new: £18.99 / Used from: £22.11
The only guide to the rather tricky ZCE/5 certification. Proofreading is poor but the exam helps you round out your skills.
PHP|architect's Guide to PHP Design PatternsPHP|architect's Guide to PHP Design Patterns by Jason E. Sweat
Buy new: £18.99 / Used from: £12.26
A useful companion to the ZCE guide, although it also covers outdated PHP4 code.
JavaScript: The Good PartsJavaScript: The Good Parts by Douglas Crockford
Buy new: £18.50 / Used from: £15.12
Crockford has finally written his own Javascript book, and it looks to be excellent