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How to use the PHP filter

Use css_class_manager_filtered_class_names filter to add class names from a PHP file.

Example:

<?php
function plugin_prefix_add_css_classes( $class_names ) {
    $additional_css_names =  [
        [
            'name'        => 'flex',
        ],
        [
            'name'        => 'hidden',
            'description' => __( 'Hide element', 'textdomain' ),
        ],
    ];
    return array_merge( $class_names, $additional_css_names );
}
add_filter( 'css_class_manager_filtered_class_names', 'plugin_prefix_add_css_classes' );