wcfm-store-name-as-slug

add_action( 'wcfmmp_new_store_created', function( $vendor_id, $wcfmmp_settings ) {
    global $wpdb;
    if ( !empty( $wcfmmp_settings['store_name'] ) ) {
        $store_name = trim( $wcfmmp_settings['store_name'] );
        $store_slug = sanitize_title( wc_clean( $store_name ) );
        $wpdb->query( "UPDATE {$wpdb->prefix}users SET user_nicename = '{$store_slug}' WHERE ID =  $vendor_id" );
    }
}, 50, 2 );

add_action('wcfm_vendor_settings_update', function($vendor_id, $wcfm_settings_form) {
    global $wpdb;
    if(!empty($wcfm_settings_form['store_name'])) {
        $store_name = trim( $wcfm_settings_form['store_name'] );
        $store_slug = sanitize_title( wc_clean( $store_name ) );
        $wpdb->query( "UPDATE {$wpdb->prefix}users SET user_nicename = '{$store_slug}' WHERE ID =  $vendor_id" );
    }
}, 10, 2);

add_filter( 'wcfm_is_allow_store_slug', '__return_false' );
add_filter('wcfm_form_custom_validation', function($wcfm_vendor_form_data, $form_type) {
    $error = false;
    if($form_type==='vendor_manage') {
        if(!empty($wcfm_vendor_form_data['store_name'])) {
            $store_name = trim( $wcfm_vendor_form_data['store_name'] );
            $store_slug = sanitize_title( wc_clean( $store_name ) );
            $store_user = get_user_by( 'slug', $store_slug );
            if ( $store_user ) {
                $error = true;
            }
        }
    } elseif($form_type === 'vendor_setting_manage') {
        if(!empty($wcfm_vendor_form_data['store_name'])) {
            $store_name = trim( $wcfm_vendor_form_data['store_name'] );
            $store_slug = sanitize_title( wc_clean( $store_name ) );
            $store_user = get_user_by( 'slug', $store_slug );
            if($store_user) {
                $store_id = $store_user->ID;
                if( wcfm_is_vendor() ) {
                    $user_id = apply_filters( 'wcfm_current_vendor_id', get_current_user_id() );
                } else  {
                    $user_id = absint( $wcfm_vendor_form_data['vendor_id'] );
                }
                if ( $store_id && $store_id != $user_id) {
                    $error = true;
                }
            }
        }
    }
    if($error){
        return array(
            'has_error' => true,
            'message' => __( 'Store name already exists - Please use a different name.' ),
        );
    }
    return array('has_error' => false,);
}, 10, 2);