Migrating from PHP 5.0.x to PHP 5.1.x
Table of Contents
- Changes in reference handling
 - Reading []
 - Integer values in function parameters
 - Class and object changes
 - Extensions
 - Date/time support
 - Changes in database support
 - Checking for E_STRICT
 
Key PHP 5.1.x features
Some of the key features of PHP 5.1.x include:
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A complete rewrite of date handling code, with improved timezone support.
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Significant performance improvements compared to PHP 5.0.X.
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PDO extension is now enabled by default.
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Over 30 new functions in various extensions and built-in functionality.
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Over 400 various bug fixes.