Upgrade

An upgrade refers to the process of updating or replacing an existing installation of PHP or any library or component with a newer version. Major upgrade refers to a change in the first digit of the version, while minor upgrades are for the other numbers in the version.

An upgrade often requires a migration: the current code has to be made compatible with the current version, but also with the upcoming version.

Documentation

See Also

• Deal with major upgrades in PHP
• The Quiet Shift Reshaping PHP Security

Related

• Version
• Semantic Versioning
• Forward Compatible
• Legacy
• Maintenance
• Migration