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Migrating from PHP 8.0.x to PHP 8.1.x

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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.

Seealso 7.1.x, 7.2.x, 7.3.x, 7.4.x, 8.0.x.

New-features New-classes New-functions Constants Incompatible Deprecated Other-changes

In this section

Backward Incompatible Changes

Access to the $GLOBALS array is now subject to a number of restrictions. Read and write ac...

Deprecated Features

Either only the new methods should be implemented, if no support for PHP prior to version...

New Classes and Interfaces

CURLStringFile

New Features

It is now possible to specify named arguments after an argument unpack. e.g. foo(...$args,...

New Functions

array_is_list

New Global Constants

CURLOPT_DOH_URL

Other Changes

Using -a without the readline extension will now result in an error. Previously, -a withou...

Source: appendices/migration81.xml · from the official PHP manual (php/doc-en)