Migrating from PHP 8.3.x to PHP 8.4.x

Table of Contents

• New Features
• New Classes, Enums, and Interfaces
• New Functions
• New Global Constants
• Backward Incompatible Changes
• Deprecated Features
• Removed Extensions
• Other Changes
• Windows Support

This new minor version brings with it a number of new features and a few incompatibilities that should be tested for before switching PHP versions in production environments.

See also the migration guides for PHP versions 7.1.x, 7.2.x, 7.3.x, 7.4.x, 8.0.x, 8.1.x, 8.2.x, 8.3.x.