Show the number of users with a tag

wpf-tag-count.php

<?php
//
// Tag Count shortcode, use like [wpf_tag_count tag="Tag Name"]
//

function wpf_tag_count( $atts ) {

	$tag    = wpf_get_tag_id( $atts['tag'] );
	$result = get_transient( 'wpf_tag_count_' . sanitize_key( $tag ) );

	if ( false !== $result ) {
		return $result;
	}

	$args = array(
		'fields'       => 'ids',
		'meta_key'     => wp_fusion()->crm->slug . '_tags',
		'meta_value'   => '"' . $tag . '"',
		'meta_compare' => 'LIKE',
	);

	$users = get_users( $args );

	// Cache the result for one day

	set_transient( 'wpf_tag_count_' . sanitize_key( $tag ), count( $users ), DAY_IN_SECONDS );

	return count( $users );

}

add_shortcode( 'wpf_tag_count', 'wpf_tag_count' );