Php useful Links

PLinks

The following links/websites are ones that i have found useful in development websits and understanding new standards. 

1. HTML

• The Web Robots Pages
• W3C Markup Validation Service
• WDG HTML Validator
• World Wide Web Consortium (W3C)

2. CSS

• A List Apart
• CSS3.info
• css Zen Garden: The Beauty in CSS Design
• Meyerweb
• W3C: Cascading Style Sheets
• W3C CSS Validation Service
• When can I use... Support tables for HTML5, CSS3, etc

3. Web Fonts

• Font Squirrel
• Google Web Fonts

4. Colours

• Color Scheme Designer

5. Screenshots

• Capture Full Page
• thumbalizer

6. JavaScript

• Core JavaScript 1.5 Reference - MDC

7. PHP

• PHP: Hypertext Preprocessor
• Top 25 Most Dangerous Programming Errors

8. SQL

• MySQL: The world's most popular open source database
• PostgreSQL: The world's most advanced open source database

9. System

• Apache HTTP Server Version 1.3 Documentation
• Apache HTTP Server Version 2.0 Documentation
• Debian GNU/Linux
• Fail2Ban
• ImageMagick: Convert, Edit, and Compose Images
• The Webalizer

10. Optimization

• Cacheability Query
• GTmetrix: Website Speed and Performance Optimization
• mod_pagespeed Apache module
• Resource Expert Droid (REDbot)

11. Useful Links

• Assigned Port Numbers
• DNSstuff: DNS tools
• Down for everyone or just me?
• Google Keyword Tool
• IntoDNS: DNS and mail servers report
• Lynx Viewer: text-only browser
• Netcraft Uptime Survey
• Rex Swain's HTTP Viewer
• View HTTP Request and Response Header