PHP 8.4 - What Is New and Why It Matters for Your Site

PHP 8.4 has arrived and brings significant improvements in performance, security, and language capabilities. If your site uses the WordPress platform, Joomla, Drupal, or any PHP-based CMS, this version directly affects the speed and security of your site. In this article we explain what's new and why it matters.

Performance - faster than ever

Every new PHP version brings improvements in speed, and PHP 8.4 continues that trend. The JIT (Just-In-Time) compiler is further optimized, with better support for complex applications and reduced memory consumption. In practice, this means your pages load faster with no code changes.

Benchmarks show PHP 8.4 is 5-15% faster than PHP 8.3 in typical web applications. For WordPress sites, this translates to measurably faster page loading, especially on pages with lots of dynamic content like WooCommerce stores or sites with many plugins.

Optimized memory management means your site can handle more simultaneous visitors on the same server resources. For shared hosting users, this is especially important because every megabyte of memory has a direct impact on performance.

Property Hooks - a revolution in OOP

One of the most significant new features in PHP 8.4 is Property Hooks. This feature allows defining get and set behavior directly on the property declaration, eliminating the need for traditional getter and setter methods.

For developers, this means cleaner and shorter code. For end users and site owners, it means plugins and themes written for PHP 8.4 will be more efficient and easier to maintain, which ultimately means fewer bugs and security flaws.

Asymmetric property visibility

PHP 8.4 introduces the ability to separately define visibility for reading and writing properties. For example, a property can be public for reading but protected for writing. This simplifies class design and reduces the need for boilerplate code.

This change may not seem revolutionary for end users, but for WordPress and plugin developers it means the ability to write more robust and safer code with less boilerplate.

New functions and improvements

PHP 8.4 also brings a number of new functions that simplify everyday work with strings, arrays, and dates. The new array_find() function allows finding the first element that satisfies a condition without writing loops. The array_find_key(), array_any(), and array_all() functions follow the same logic and make working with arrays more intuitive.

Improved multibyte string support is particularly important for sites in languages with non-Latin or accented characters. Working with such text is more efficient and reliable, with fewer edge-case issues that could previously cause unexpected behavior.

A new HTML5 parser class (Dom\HTMLDocument) properly parses HTML5 documents, which is important for tools that work with HTML content - from SEO plugins to email template generators.

Security improvements

Every new PHP version includes security fixes and improvements. PHP 8.4 brings enhanced cryptographic support, better validation of input data, and stronger protection against typical web attacks.

It's particularly important to emphasize that older PHP versions (7.x and earlier) no longer receive security patches. If your site uses PHP 7.4 or older, not only are you missing performance improvements, you are also exposed to known security vulnerabilities. Moving to PHP 8.4 is one of the most important things you can do for your site's security.

Compatibility with WordPress

WordPress 6.7+ has full support for PHP 8.4. However, compatibility depends not just on the WordPress core - plugins and themes must also be compatible. Before switching to PHP 8.4, check whether all your plugins and theme support this version.

Most popular plugins (WooCommerce, Yoast SEO, Elementor, Contact Form 7) already have PHP 8.4 compatibility. Problems most often occur with older, unmaintained plugins that use deprecated functions.

We recommend first testing the site with PHP 8.4 on a staging environment before changing the version on production. On BeoHosting you can create a staging copy of the site for safe testing.

Compatibility with other CMS platforms

Joomla 5.x fully supports PHP 8.4. Drupal 10 and 11 also have support, although it's advisable to check compatibility of all installed modules. PrestaShop 8 and Magento 2.4.7+ are also compatible with PHP 8.4.

For custom PHP applications, watch out for deprecated functions and behavior changes. The PHP migration guide on the official site provides a detailed overview of all changes that may affect your code.

How to change the PHP version on BeoHosting

Changing the PHP version on BeoHosting is simple and takes less than a minute. Log into the intuitive hosting panel, find the "Software" section, and click on "Select PHP Version". Choose PHP 8.4 from the dropdown and click "Apply". The change is applied immediately, without restarting the server or interrupting the site.

You can set the PHP version separately for each domain on your account. That means you can have one site on PHP 8.4 while another stays on PHP 8.3, which is ideal for gradual testing and transition.

Recommendations for the transition

First of all, make a full backup of the site, including the database. Then update WordPress, all plugins, and the theme to the latest versions. Remove inactive plugins and themes because they can also cause compatibility issues.

After changing the PHP version, thoroughly test the site - check all pages, forms, e-commerce functionality, and admin panel. Pay attention to the PHP error log in cPanel for any warnings or errors.

Conclusion

PHP 8.4 brings better performance, new language features, and important security improvements. For most sites, the transition to PHP 8.4 is simple and brings measurable benefits. On BeoHosting you can change the PHP version in one click. If you're not sure whether your site is compatible, contact our support - we'll be happy to help with testing and the transition.