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Editing: featured-image.php

<?php
/**
 * Featured image meta checkbox to inline SVG
 *
 * Allow users to select whether featured images should contain the SVG Support class
 * Check if the featured image is SVG first, then display meta box for SVG only.
 */
if ( ! defined( 'ABSPATH' ) ) {
	exit; // Exit if accessed directly
}

/**
 * Add checkbox to the featured image metabox
 */
function bodhi_svgs_featured_image_meta( $content ) {

global $post;

// check if featured image is set and has extension of .svg or .svgz
	// need to make this check on the moment that the thumbnail shows up in the meta box.
	if ( strpos( get_the_post_thumbnail(), '.svg' ) ) {

$text 	= __( 'Render this SVG inline (advanced)', 'svg-support' );
		$id 	= 'inline_featured_image';
		$value 	= esc_attr( get_post_meta( $post->ID, $id, true ) );
		$label 	= '<label for="' . $id . '" class="selectit"><input name="' . $id . '" type="checkbox" id="' . $id . '" value="' . $value . ' "'. checked( $value, 1, false) .'> ' . $text .'</label>';

return $content .= $label;

} else {

return $content;

}

}
if ( bodhi_svgs_advanced_mode() ) {
	add_filter( 'admin_post_thumbnail_html', 'bodhi_svgs_featured_image_meta' );
}

/**
 * Save featured image meta data when saved
 */

function bodhi_svgs_save_featured_image_meta( $post_id, $post, $update ) {

// if gutenberg is active, disable the classic editor checkbox
	if( isset($_REQUEST['hidden_post_status']) ){

$value = 0;
		if ( isset( $_REQUEST['inline_featured_image'] ) ) {
			$value = 1;
		}

// Check if post type supports 'thumbnail' (Featured Image)
		if ( post_type_supports( get_post_type( $post_id ), 'thumbnail' ) ) {

// set meta value to either 1 or 0
			update_post_meta( $post_id, 'inline_featured_image', $value );

}

add_action( 'save_post', 'bodhi_svgs_save_featured_image_meta', 10, 3 );

/*
*	Save featured image meta for Gutenberg Editor
*/

function bodhi_svgs_register_meta() {

register_meta( 'post', 'inline_featured_image', array(
        'show_in_rest' => true,
        'single' => true,
        'type' => 'boolean',
		'auth_callback' => '__return_true'
    ) );

}

add_action( 'init', 'bodhi_svgs_register_meta' );

/**
 * Add class to the featured image output on front end
 */
function bodhi_svgs_add_class_to_thumbnail( $thumb ) {

$inline_featured_image = get_post_meta( get_the_ID(), 'inline_featured_image' );

if ( is_array( $inline_featured_image ) && in_array( 1, $inline_featured_image ) ) {

global $bodhi_svgs_options;

if ( ! empty( $bodhi_svgs_options['css_target'] ) ) {

$target_class = $bodhi_svgs_options['css_target'];

} else {

$target_class = 'style-svg';

}

if ( is_singular() ) {

$thumb = str_replace( 'attachment-', $target_class . ' attachment-', $thumb );

}

return $thumb;

}
if ( bodhi_svgs_advanced_mode() ) {
	add_filter( 'post_thumbnail_html', 'bodhi_svgs_add_class_to_thumbnail' );
}

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