Principles are general ideas. They explain why you do things a certain way, that is, they explain patterns. Take the sewing and woodworking pattern "measure twice, cut once." Why do that? Because of the principle "materials are expensive, and shouldn't be wasted." (OK, that's a pretty obvious principle.)
Here are principles on this website.
|Confirm destructive actions||
People make mistakes. If there's a destructive action, like deleting a record, then confirm it with users.
|Don't trust user data||
Validate and sanitize user data.
|Validation||Validation library, Log files|
|Get requirements right||
Make sure you know what a program is supposed to do, before you write it.
|Never store plain text passwords||
Store hashes instead.
|Security||A user table|
|Plan then zoom||
Write a program as a broad plan first, leaving the deets for functions. Then work on the functions separately.
|Reduce cognitive complexity||
Make your program easy to think about. You'll spend less time wrestling with bugs.
|More conditions, Editing relationships|
Reuse your code across programs, using functions and page components.
|Page components, Code library, One add/edit page, M:N, Goats, clubs, and comedians, Validation basics, Validation functions|
|Security by obscurity doesn't work||
Keep your code secret, and nobody can hack it, right? Well... it's not that easy.
|Security||Where to put log files|