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✏️ Editing: class-custom-body-class.php

<?php

namespace ASENHA\Classes;

/**
 * Class for Custom Body Class module
 *
 * @since 6.9.5
 */
class Custom_Body_Class {
    
    /**
     * Add Custom Body Class meta box for enabled post types
     * 
     * @since 3.9.0
     */
    public function add_custom_body_class_meta_box( $post_type, $post ) {

$options = get_option( ASENHA_SLUG_U, array() );
        $enable_custom_body_class_for = $options['enable_custom_body_class_for'];

foreach ( $enable_custom_body_class_for as $post_type_slug => $is_custom_body_class_enabled ) {
            if ( ( get_post_type() == $post_type_slug ) && $is_custom_body_class_enabled ) {

// Skip adding meta box for post types where Gutenberg is enabled
                // if ( 
                //  function_exists( 'use_block_editor_for_post_type' ) 
                //  && use_block_editor_for_post_type( $post_type_slug ) 
                // ) {
                //  continue; // go to the beginning of next iteration
                // }

add_meta_box(
                    'asenha-custom-body-class', // ID of meta box
                    'Custom &lt;body&gt; Class', // Title of meta box
                    [ $this, 'output_custom_body_class_meta_box' ], // Callback function
                    $post_type_slug, // The screen on which the meta box should be output to
                    'normal', // context
                    'high' // priority
                    // array(), // $args to pass to callback function. Ref: https://developer.wordpress.org/reference/functions/add_meta_box/#comment-342
                );

}
        }

}

/**
     * Render External Permalink meta box
     *
     * @since 3.9.0
     */
    public function output_custom_body_class_meta_box( $post ) {
        ?>
        <div class="custom-body-class-input">
            <input name="<?php echo esc_attr( 'custom_body_class' ); ?>" class="large-text" id="<?php echo esc_attr( 'custom_body_class' ); ?>" type="text" value="<?php echo esc_attr( get_post_meta( $post->ID, '_custom_body_class', true ) ); ?>" placeholder="e.g. light-theme new-year-promo" />
            <div class="custom-body-class-input-description">Use blank space to separate multiple classes, e.g. first-class second-class</div>
            <?php wp_nonce_field( 'custom_body_class_' . $post->ID, 'custom_body_class_nonce', false, true ); ?>
        </div>
        <?php
    }

/**
     * Save custom body class input
     *
     * @since 3.9.0
     */
    public function save_custom_body_class( $post_id ) {

// Only proceed if nonce is verified
        if ( isset( $_POST['custom_body_class_nonce'] ) && wp_verify_nonce( $_POST['custom_body_class_nonce'], 'custom_body_class_' . $post_id ) ) {

// Get the value of external permalink from input field
            $custom_body_class = isset( $_POST['custom_body_class'] ) ? sanitize_text_field( trim( $_POST['custom_body_class'] ) ) : '';

// Update or delete external permalink post meta
            if ( ! empty( $custom_body_class ) ) {
                update_post_meta( $post_id, '_custom_body_class', $custom_body_class );
            } else {
                delete_post_meta( $post_id, '_custom_body_class' );
            }

}

}
    
    /**
     * Append custom body classes to the frontend <body> tag
     *
     * @since 4.4.0
     */
    public function append_custom_body_class( $classes ) {

// Only add custom body classes to the singular view of enabled post types
        if ( is_singular() ) {

global $post;
            $custom_body_classes = get_post_meta( $post->ID, '_custom_body_class', true );

if ( ! empty( $custom_body_classes ) ) {

$custom_body_classes = explode( ' ', $custom_body_classes );

foreach( $custom_body_classes as $custom_body_class ) {
                    $classes[] = sanitize_html_class( $custom_body_class );
                }

}

return $classes;

}
    
}

MR SKB