1. Conditional Feature Loading
Let’s say you have a plugin that provides extra features specifically for WooCommerce users. Instead of loading this functionality for everyone, you can target WooCommerce sites only:
php
if ( ! function_exists( ‘is_plugin_active’ ) ) {
include_once( ABSPATH . ‘wp-admin/includes/plugin.php’ );
}
if ( is_plugin_active( ‘woocommerce/woocommerce.php’ ) ) {
// Load WooCommerce-specific functionality
add_action( ‘woocommerce_after_cart’, ‘my_custom_cart_message’ );
function my_custom_cart_message() {
echo ‘<p>Enjoy a 10% discount on your next purchase!</p>’;
}
}
2. Preventing Plugin Conflicts
Some plugins don’t play well together. You can detect if a known conflicting plugin is active and adjust your plugin accordingly:
php
if ( ! function_exists( ‘is_plugin_active’ ) ) {
include_once( ABSPATH . ‘wp-admin/includes/plugin.php’ );
}
if ( is_plugin_active( ‘conflicting-plugin/conflict.php’ ) ) {
// Disable specific functionality or warn the user
add_action( ‘admin_notices’, function() {
echo ‘<div class=”notice notice-warning”><p>Warning: Conflicting Plugin Detected. Please deactivate “Conflicting Plugin” to ensure compatibility.</p></div>’;
});
}
3. Encouraging Plugin Installation
If your plugin or theme works better with another plugin, you can check its status and suggest installation:
php
if ( ! function_exists( ‘is_plugin_active’ ) ) {
include_once( ABSPATH . ‘wp-admin/includes/plugin.php’ );
}
if ( ! is_plugin_active( ‘contact-form-7/wp-contact-form-7.php’ ) ) {
add_action( ‘admin_notices’, function() {
echo ‘<div class=”notice notice-info”><p>To unlock form features, please install and activate Contact Form 7.</p></div>’;
});
}
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