PHP: Migrating from PHP 8.3.x to PHP 8.4.x

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value='es/migration84.php'>Spanish</option> <option value='fr/migration84.php'>French</option> <option value='it/migration84.php'>Italian</option> <option value='ja/migration84.php'>Japanese</option> <option value='pt_BR/migration84.php'>Brazilian Portuguese</option> <option value='ru/migration84.php'>Russian</option> <option value='tr/migration84.php'>Turkish</option> <option value='uk/migration84.php'>Ukrainian</option> <option value='zh/migration84.php'>Chinese (Simplified)</option> <option value='help-translate.php'>Other</option> </select> </fieldset> </form> </div> </div><div id="migration84" class="appendix"> <h1 class="title">Migrating from PHP 8.3.x to PHP 8.4.x</h1> <h2>Table of Contents</h2><ul class="chunklist chunklist_appendix"><li><a href="migration84.new-features.php">New Features</a></li><li><a href="migration84.new-classes.php">New Classes, Enums, and Interfaces</a></li><li><a href="migration84.new-functions.php">New Functions</a></li><li><a href="migration84.constants.php">New Global Constants</a></li><li><a href="migration84.incompatible.php">Backward Incompatible Changes</a></li><li><a href="migration84.deprecated.php">Deprecated Features</a></li><li><a href="migration84.removed-extensions.php">Removed Extensions</a></li><li><a href="migration84.other-changes.php">Other Changes</a></li><li><a href="migration84.windows-support.php">Windows Support</a></li></ul> <p class="para"> This new minor version brings with it a number of <a href="migration84.new-features.php" class="link">new features</a> and a <a href="migration84.incompatible.php" class="link">few incompatibilities</a> that should be tested for before switching PHP versions in production environments. </p> <p class="para"> See also the migration guides for PHP versions <a href="migration71.php" class="link">7.1.x</a>, <a href="migration72.php" class="link">7.2.x</a>, <a href="migration73.php" class="link">7.3.x</a>, <a href="migration74.php" class="link">7.4.x</a>, <a href="migration80.php" class="link">8.0.x</a>, <a href="migration81.php" class="link">8.1.x</a>, <a href="migration82.php" class="link">8.2.x</a>, <a href="migration83.php" class="link">8.3.x</a>. </p> </div> <div class="contribute"> <h3 class="title">Improve This Page</h3> <div> </div> <div class="edit-bug"> <a href="https://github.com/php/doc-base/blob/master/README.md" title="This will take you to our contribution guidelines on GitHub" target="_blank" rel="noopener noreferrer">Learn How To Improve This Page</a> • <a href="https://github.com/php/doc-en/blob/master/appendices/migration84.xml">Submit a Pull Request</a> • <a href="https://github.com/php/doc-en/issues/new?body=From%20manual%20page:%20https:%2F%2Fphp.net%2Fmigration84%0A%0A---">Report a Bug</a> </div> </div><section id="usernotes"> <div class="head"> <span class="action"><a href="/manual/add-note.php?sect=migration84&repo=en&redirect=https://www.php.net/manual/en/migration84.php">＋<small>add a 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PHP: Migrating from PHP 8.3.x to PHP 8.4.x - Manual