I had a call last week with a client who was excited about adding AI features to their content workflow. Automatic post summaries, suggested tags, that kind of thing. My team jumped on it and prototyped something using PHP 7.4, feeling pretty confident about future-proofing their setup. Solid piece of work, latest syntax, clean as a whistle.
Then we pushed it to staging and it broke. Not a syntax error on our end, but a PHP version incompatibility. Their server could run PHP 7.4, but the site itself was still on 7.2 for various legacy reasons. My first instinct was to just bump their PHP version, and yeah, that would fix their problem then and there. But what about the next client? Or a plugin we wanted to release to the wider WordPress community?
This goes beyond one client. It is a recurring problem in WordPress development: the tension between using newer language features and keeping wide compatibility. WordPress core has to run across a huge range of hosting setups, so the minimum PHP version for core features tends to trail what most of us think of as modern. As of WordPress 6.9, the minimum is still PHP 7.2, even though many hosts now push 8.0 and up. That gap forces a decision for anyone building new features, especially something moving as fast as AI.
WordPress PHP compatibility in AI features
This is exactly what the WordPress Core AI team is working through right now. I was reading their latest contributor check-in (the summary is at make.wordpress.org/ai), and the discussion about PHP versions for the new Abilities API sounded very familiar. That API is slated for WordPress 6.9, so in practice it has to be compatible with PHP 7.2. They decided to go with 7.2 for the core Abilities API and let related components, like the main AI Client, target PHP 7.4. That is a sensible split: keep the foundational pieces widely usable, and leave room for more advanced work where the environment allows it.
So what does this mean for your own WordPress AI features, or plugin work in general? You have to build for it. Account for different PHP environments and provide fallbacks when a feature cannot run. Ignore that and you will spend your time answering support tickets instead.
Conditional logic for PHP versions
Here is a basic example of how you might handle this in your own code, so your features only load when the server meets the PHP version you need. It will not cover every scenario, but it is a start.
<?php
/**
* Plugin Name: BBioon AI Features
* Description: Demonstrates conditional AI features based on PHP version.
* Version: 1.0.0
* Author: BBioon
* Text Domain: bbioon-ai
*/
if ( ! defined( 'ABSPATH' ) ) {
exit; // Exit if accessed directly.
}
/**
* Check PHP version for advanced AI features.
*/
function bbioon_check_php_for_advanced_ai() {
// Current WordPress core minimum PHP version.
// Always check the official WordPress requirements for the latest.
$min_php_for_core = '7.2';
// Our desired PHP version for advanced AI features.
$min_php_for_advanced_ai = '7.4';
if ( version_compare( PHP_VERSION, $min_php_for_advanced_ai, '>=' ) ) {
// PHP 7.4 or higher is available. Load advanced AI features.
add_action( 'init', 'bbioon_register_advanced_ai_features' );
} elseif ( version_compare( PHP_VERSION, $min_php_for_core, '>=' ) ) {
// PHP 7.2 or higher, but less than 7.4. Load basic AI features.
add_action( 'init', 'bbioon_register_basic_ai_features' );
} else {
// PHP version is too old for even basic AI. Show admin notice.
add_action( 'admin_notices', 'bbioon_php_version_notice' );
}
}
add_action( 'plugins_loaded', 'bbioon_check_php_for_advanced_ai' );
function bbioon_register_advanced_ai_features() {
// Code for advanced AI features using PHP 7.4+ syntax
error_log( 'BBioon: Advanced AI features loaded.' );
// Example: New arrow functions, typed properties etc.
}
function bbioon_register_basic_ai_features() {
// Code for basic AI features compatible with PHP 7.2+
error_log( 'BBioon: Basic AI features loaded.' );
}
function bbioon_php_version_notice() {
?><div class="notice notice-error"><p><strong>BBioon AI Features:</strong> This plugin requires PHP version 7.2 or higher. Please update your PHP version to enable AI features.</p></div><?php
}
This snippet (and yes, remember to escape special characters like <, >, and & in code blocks) uses version_compare() to check the server’s PHP version and load different sets of features accordingly. It is a straightforward way to build plugins that will not break on older setups while still giving modern environments the newer code. This is the same split the Core AI team used between the Abilities API and its separate client.
The practical takeaway
The takeaway is simple: do not assume. If you want wide adoption, especially on core WordPress, build for the lowest common denominator. If you are building something on the newer end, split it out or give it fallbacks. The Core AI team chose to focus on “integrated AI” for quick wins in the AI Experiments plugin rather than a full “chat AI” experience at the start, which is the same kind of thinking. Get a solid foundation in place first.
This stuff gets complicated fast. If you are tired of debugging someone else’s mess and just want your site to work, drop my team a line. We have probably seen it before.
