Forminator - custom logo/image upload and shortcode display on multisite

forminator-upload-display-shortcode-multisite.php

<?php 

/* tested with Forminator 1.18
use as MU plugin */

add_shortcode('custom-site-logo', 'my_custom_site_logo' );

function my_custom_site_logo() {
	
	$logo_url = get_option( 'frmt_site_custom_logo' );
	$html = '<img class="fl-photo-img size-full frmt-custom-logo" src="' . $logo_url . '"itemprop="image" height="68" width="300">';
	
	return $html;
	
}


# get uploaded logo URL and site ID
# and save them in subsites _options table

add_action( 'forminator_custom_form_submit_before_set_fields', 'my_custom_logo_setfile', 10, 3 );
function my_custom_logo_setfile( $entry, $form_id, $fields_data ) {
	
	
	$site_id = 'hidden-1'; // set ID of hidden field for site ID here
	$upload_form_id = 1245; // set ID of the form here
	$upload_field = 'upload-1'; // set ID of upload field
	
	#########################

	if ( $form_id<>$upload_form_id ) {
		return;
	}
		
	// get site ID and URL from form
	$blog_id = 0;
	$logo_url = '';
	foreach ( $fields_data as $field_data ) {
		if ( $field_data['name'] == $site_id ) {
			$blog_id = $field_data['value'];
		}
		if ( $field_data['name'] == $upload_field ) {
			$logo_url = $field_data['value']['file']['file_url'];
		}
		
	}
	
	// if site ID set: get file URL, switch to blog, save option, switch back
	if ($blog_id > 0) {
		
		if ( is_multisite() ) {
			switch_to_blog( $blog_id );
		}
		
		
		// set option
		update_option( 'frmt_site_custom_logo', $logo_url, false);
		
		if ( is_multisite() ) {
			restore_current_blog();
		}
		
	}
	
}