force-first-last.php

<?php
/*
Plugin Name: Force First and Last Name as Display Name
Description: Force the user field display_name to be set as the user's first and last name.
Version: 1.2.2
Author: Contributors
Text Domain: force-first-last
Domain Path: /languages
*/
define( 'FFL_BASENAME', plugin_basename( __FILE__ ) );

/**
 * Load text domain
 */
function ffl_load_plugin_text_domain() {
	load_plugin_textdomain( 'force-first-last', false, basename( dirname( __FILE__ ) ) . '/languages' ); 
}
add_action( 'plugins_loaded', 'ffl_load_plugin_text_domain' );

/**
 * Generate the Display Name
 *
 */
function ffl_generate_display_name( $first_name, $last_name ) {
	if ( empty( $first_name ) || empty( $last_name ) ) {
		return;
	}

	/**
	 * Adjust the display name order to be first last or last first depending on location.
	 *
	 * @param $display_name_order array An array of name parts.
	 * @return $display_name A formatted display name.
	 *
	 */
	$display_name_order = apply_filters( 'ffl_display_name_order', array( $first_name, $last_name ), $first_name, $last_name );
	$display_name = trim( $display_name_order[0] . ' ' . $display_name_order[1] );
	return $display_name;
}

/**
 * Hide Display Name field on profile page.
 *
 */
function ffl_show_user_profile( $user ) {
	$hide_display_name = apply_filters( 'pmpro_ffl_hide_display_name_profile', true, $user );

	if( $hide_display_name ){
		?>
		<script>
			jQuery(document).ready(function() {
				jQuery('#display_name').parent().parent().hide();
			});
		</script>
		<?php
	}
}
add_action( 'show_user_profile', 'ffl_show_user_profile' );
add_action( 'edit_user_profile', 'ffl_show_user_profile' );

/**
 * Fix first last on profile saves.
 *
 */
function ffl_save_extra_profile_fields( $user_id ) {
	if ( ! current_user_can( 'edit_user', $user_id ) ) {
		return false;
	}

	if ( isset( $_POST['first_name'] ) && isset( $_POST['last_name'] ) ) {
		$first_name = sanitize_text_field( trim( $_POST['first_name'] ) );
		$last_name = sanitize_text_field( trim( $_POST['last_name'] ) );
		$display_name = ffl_generate_display_name( $first_name, $last_name );
	} else {
		$info = get_userdata( $user_id );
		$display_name = ffl_generate_display_name( $info->first_name, $info->last_name );
		if ( ! $display_name ) {
			$display_name = $info->user_login;
		}
	}
		
	$_POST['display_name'] = $display_name;
	
	$args = array(
		'ID' => $user_id,
		'display_name' => $display_name
	);   
	wp_update_user( $args );
}
add_action( 'personal_options_update', 'ffl_save_extra_profile_fields' );
add_action( 'edit_user_profile_update', 'ffl_save_extra_profile_fields' );
add_action( 'pmpro_personal_options_update', 'ffl_save_extra_profile_fields' );

/**
 * Removes the "Display Name" field on the Paid Memberships Pro frontned profile.
 *
 */
function ffl_pmpro_member_profile_edit_user_object_fields( $user_fields ) {
	unset( $user_fields['display_name'] );
	return $user_fields;
}
add_filter( 'pmpro_member_profile_edit_user_object_fields', 'ffl_pmpro_member_profile_edit_user_object_fields' );

/**
 * Fix first last on register.
 *
 */
function ffl_fix_user_display_name( $user_id ) {
	// Get the user's first and last name.
	$info = get_userdata( $user_id );
	$display_name = ffl_generate_display_name( $info->first_name, $info->last_name );
	if ( ! $display_name ) {
		$display_name = $info->user_login;
	}

	$args = array(
		'ID' => $user_id,
		'display_name' => $display_name
	);
	wp_update_user( $args );
}
add_action( 'user_register', 'ffl_fix_user_display_name', 20 );

/**
 * Add Settings Page
 *
 */
function ffl_settings_menu_item() {
	add_options_page('Force First Last', __( 'Force First Last', 'force-first-last' ), 'manage_options', 'ffl_settings', 'ffl_settings_page');
}
add_action( 'admin_menu', 'ffl_settings_menu_item', 20 );

/**
 * Settings Page Content
 *
 */
function ffl_settings_page() { ?>
	<style>
		/* Admin Header */
		.ffl_admin {
			padding: 20px;
		}
	</style>
	<div class="wrap">
		<div class="ffl_admin">
			<h1 class="wp-heading-inline"><?php esc_html_e( 'Force First and Last Name', 'force-first-last') ;?></h1>
			<?php if ( ! empty($_REQUEST['updateusers']) && current_user_can( 'manage_options' ) ) {
				// Check the nonce.
				check_admin_referer( 'ffl_update_users', 'ffl_update_users_nonce' );

				global $wpdb;
				$user_ids = $wpdb->get_col("SELECT ID FROM $wpdb->users");

				foreach ( $user_ids as $user_id ) {
					ffl_fix_user_display_name($user_id);
					set_time_limit(30);
				} ?>
				<div class="notice inline updated"><p><?php printf( __( '%s users updated', 'force-first-last' ), count( $user_ids ) ); ?></p></div>
			<?php } ?>
			<p><?php
				$allowed_ffl_admin_text_strings_html = array (
					'a' => array (
						'href' => array(),
						'target' => array(),
						'title' => array(),
					),
					'strong' => array(),
					'em' => array(),
				);
				echo wp_kses( __( 'The <em>Force First and Last Name as Display Name</em> plugin will only fix display names at registration or when a profile is updated. If you just activated this plugin, please click on the button below to update the display names of your existing users.', 'force-first-last' ), $allowed_ffl_admin_text_strings_html ); ?>
			</p>
			<form method="post" action="">
			<input type="hidden" name="updateusers" value="1" />
			<?php wp_nonce_field( 'ffl_update_users', 'ffl_update_users_nonce' ); ?>
			<input type="submit" class="button button-hero button-primary" value="<?php esc_attr_e( 'Update Existing Users', 'force-first-last' ); ?>" />
			</form>
			<p><?php echo wp_kses( __( '<strong>WARNING:</strong> This process may take a long time for sites with many users or hosted on a slow server. <strong>Running this script may hang up or cause other issues with your site.</strong> Use at your own risk.', 'force-first-last' ), $allowed_ffl_admin_text_strings_html ); ?></p>
		</div>
	</div> <!-- end ffl_admin -->
	<?php
}