Get Ultimate member Search Term or keyword

gistfile1.php

<?php
/**
 * Gets the search term from the member directory search query.
 *
 * @return void
 */
function um_member_directory_search_term() {
    // Only execute on the members page.
    if ( ! um_is_core_page( 'members' ) ) {
        return;
    }

    // Get the URL of the current request.
    $search_url = parse_url( $_SERVER['REQUEST_URI'] );

    // Check if the query string contains search parameters.
    if ( isset( $search_url['query'] ) ) {
        // Split the query string into an array.
        $array = explode( '&', $search_url['query'] );

        // Create an array of search parameters.
        $search_array = array();
        foreach ( $array as $value ) {
            if ( strpos( $value, 'search_' ) === 0 ) {
                $search_array[] = $value;
            }
        }

        // Get the first search parameter.
        $search_term_array = explode( '=', $search_array[0] );

        // Get the search term and sanitize it.
        $search_term = sanitize_text_field( $search_term_array[1] );

        // Echo the search term.
        return $search_term;
    }
}