Moving up the food chain, the next most helpful thing is online help for PHP - to be able to jump to a reference in the PHP manual in a click or two means you are never far from an answer. More advanced editors even let you select functions from within your code, and they'll jump straight to the manual entry for them.
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Writing PHP The design process Analysing the requirements Designing the solution Developing the code Implementing the application Maintenance and support Which IDEs are good Line numbering Syntax highlighting Online help Code insight Interactive debugging Profiling Popular IDEs Laying out your files Directory structuring Group development How to develop code Version control Documenting your project Testing Distributing your code Charging for your work PHP Encoders Cross-platform code 1: Loading extensions Cross-platform code 2: Using extensions Cross-platform code 3: Path and line separators Cross-platform code 4: Coping with php.ini differences Cross-platform code 5 Debugging What is a bug? The most basic debugging technique Making assertions Triggering your own errors Source highlighting Handling MySQL errors Exception handling Backtracing your code Debuggers Custom error handlers Custom exception handlers Using @ to disable errors phpinfo() Debugging practice Coding style Comments and whitespace Variable naming Functions Distinguishing code blocks Output style Options for Tidy Troubleshooting Error types Choosing what types of errors you see Common errors Getting Help The documentation Mailing lists Websites IRC Conferences User groups Submitting a bug Contacting the author Getting qualified Summary Exercises Further reading Next chapter
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