Migrating from PHP 5.0.x to PHP 5.1.x

Table of Contents

• Key PHP 5.1.x features
• 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

See also the migration guides for PHP versions 5.0.x, 5.2.x, 5.3.x, 5.4.x, 5.5.x and 5.6.x.