GravityView: Add multiple og:image tags on the single entry view

gv-snippet.php

<?php

/**
 * Displays multiple "og:image" opengraph meta tags according to the single entry available gallery images
 */ 
function my_gv_add_opengraph_multi_image() {
    if( ! function_exists('gravityview_is_single_entry') || ! function_exists( 'gravityview_get_entry') ) {
        return;
    }
    // get single entry id
    $entry_id = gravityview_is_single_entry();
    if( empty( $entry_id ) ) {
    	return;
    }
    $entry = gravityview_get_entry( $entry_id );
    $form_id = empty( $entry['form_id'] ) ? '' : $entry['form_id'];
	switch ( $form_id ) {
		// Customise to your own case FORM ID
		case '3':
			// Customise to your own FIELD ID
			$img_field = '9';
			break;
	}

    if( !empty( $img_field ) && isset( $entry[ $img_field ] ) ) {
     	$imgs = json_decode( $entry[ $img_field ] );
    	if( is_array( $imgs  ) ) :
    		foreach( $imgs as $img ) : ?>
				<meta property="og:image" content="<?php echo esc_url( $img ); ?>" />
    		<?php endforeach;
    	else: ?>
    		<meta property="og:image" content="<?php echo esc_url( $imgs ); ?>" />
    	<?php endif;
    }
}

add_filter( 'wp_head', 'my_gv_add_opengraph_multi_image', 10 );