PHP - Hypertext Preprocessor

PHP is a widely-used general-purpose scripting language that is especially suited for Web development and can be embedded into HTML.

Working with text and HTML

• Truncating Text
• Word Wrapping
• Formatting Data as HTML

Data manipulation

• Sorting Arrays of Arrays
• Exporting Data to Excel
• Passing variables to JavaScript
• Generating an XML Response for Ajax Applications
• Useful Functions

File system functions

• Directory Listing
• Directory Listing: Images
• Using Output Buffering to Cache PHP Files

Parsing external data sources

• Parsing HTML to find Links
• Parsing robots.txt
• RSS and Atom Feed Reader - demonstration
• RSS Feed Reader Source Code
• RSS Feed Reader Code Example
• Atom Feed Reader Source Code
• YouTube API Feed Reader: Source Code
• PHP: Displaying Twitter Search Results in HTML

Image manipulation

• Protecting forms using a CAPTCHA
• Creating on-the-fly 'broken' images

Date functions

• Calculating past and future dates

Security

• Preventing X-PHP-Script Exposure of Variables