wp_new_user_notification() WP 2.0.0

Notifies by email the site administrator about new user registration, and sends the user an email with a login and password.

This is a pluggable function, and it can be replaced by a plugin. It means that this function is defined (works) only after all plugins are loaded (included), but before this moment this function has not defined. Therefore, you cannot call this and all functions depended on this function directly from a plugin code. They need to be called on plugins_loaded hook or later, for example on init hook.

Function replacement (override) — in a plugin you can create a function with the same name, then it replace this function.

Works based on: wp_mail()

Hooks from the function

wp_new_user_notification_email_admin

retrieve_password_key

wp_new_user_notification_email

Return

Null. Nothing.

Usage

wp_new_user_notification( $user_id, $deprecated, $notify );

$user_id(int) (required): User ID.
$deprecated(null): Not used (argument deprecated).
Default: null
$notify(string): Type of notification that should happen. Accepts 'admin' or an empty string (admin only), 'user', or 'both' (admin and user).
Default: ''

Examples

#1 Notify an administrator and the user.

Suppose, when registering a user, you need to notify yourself (you are the admin) and send an email to the new user by email with a link to set a new password:

$new_user_id = 8;

wp_new_user_notification( $new_user_id, 'both' );

In the result, the admin will get an email:

New user registration on your site Example:

Username: user

Email: user@user.user

The user will get:

Username: user

To set your password, visit the following address:

<http://example.com/wp-login.php?action=rp&key=1ORsgCiUtZdwDw3tss4U&login=user>

http://example.com/wp-login.php

Notes

Global. wpdb. $wpdb WordPress database object for queries.
Global. PasswordHash. $wp_hasher Portable PHP password hashing framework instance.

Changelog

Since 2.0.0	Introduced.
Since 4.3.0	The `$plaintext_pass` parameter was changed to `$notify`.
Since 4.3.1	The `$plaintext_pass` parameter was deprecated. `$notify` added as a third parameter.
Since 4.6.0	The `$notify` parameter accepts `'user'` for sending notification only to the user created.

Code of wp new user notification: `wp-includes/pluggable.php` ^{WP 5.2.2}

<?php
function wp_new_user_notification( $user_id, $deprecated = null, $notify = '' ) {
	if ( $deprecated !== null ) {
		_deprecated_argument( __FUNCTION__, '4.3.1' );
	}

	// Accepts only 'user', 'admin' , 'both' or default '' as $notify
	if ( ! in_array( $notify, array( 'user', 'admin', 'both', '' ), true ) ) {
		return;
	}

	global $wpdb, $wp_hasher;
	$user = get_userdata( $user_id );

	// The blogname option is escaped with esc_html on the way into the database in sanitize_option
	// we want to reverse this for the plain text arena of emails.
	$blogname = wp_specialchars_decode( get_option( 'blogname' ), ENT_QUOTES );

	if ( 'user' !== $notify ) {
		$switched_locale = switch_to_locale( get_locale() );

		/* translators: %s: site title */
		$message = sprintf( __( 'New user registration on your site %s:' ), $blogname ) . "\r\n\r\n";
		/* translators: %s: user login */
		$message .= sprintf( __( 'Username: %s' ), $user->user_login ) . "\r\n\r\n";
		/* translators: %s: user email address */
		$message .= sprintf( __( 'Email: %s' ), $user->user_email ) . "\r\n";

		$wp_new_user_notification_email_admin = array(
			'to'      => get_option( 'admin_email' ),
			/* translators: New user registration notification email subject. %s: Site title */
			'subject' => __( '[%s] New User Registration' ),
			'message' => $message,
			'headers' => '',
		);

		/**
		 * Filters the contents of the new user notification email sent to the site admin.
		 *
		 * @since 4.9.0
		 *
		 * @param array   $wp_new_user_notification_email {
		 *     Used to build wp_mail().
		 *
		 *     @type string $to      The intended recipient - site admin email address.
		 *     @type string $subject The subject of the email.
		 *     @type string $message The body of the email.
		 *     @type string $headers The headers of the email.
		 * }
		 * @param WP_User $user     User object for new user.
		 * @param string  $blogname The site title.
		 */
		$wp_new_user_notification_email_admin = apply_filters( 'wp_new_user_notification_email_admin', $wp_new_user_notification_email_admin, $user, $blogname );

		@wp_mail(
			$wp_new_user_notification_email_admin['to'],
			wp_specialchars_decode( sprintf( $wp_new_user_notification_email_admin['subject'], $blogname ) ),
			$wp_new_user_notification_email_admin['message'],
			$wp_new_user_notification_email_admin['headers']
		);

		if ( $switched_locale ) {
			restore_previous_locale();
		}
	}

	// `$deprecated was pre-4.3 `$plaintext_pass`. An empty `$plaintext_pass` didn't sent a user notification.
	if ( 'admin' === $notify || ( empty( $deprecated ) && empty( $notify ) ) ) {
		return;
	}

	// Generate something random for a password reset key.
	$key = wp_generate_password( 20, false );

	/** This action is documented in wp-login.php */
	do_action( 'retrieve_password_key', $user->user_login, $key );

	// Now insert the key, hashed, into the DB.
	if ( empty( $wp_hasher ) ) {
		require_once ABSPATH . WPINC . '/class-phpass.php';
		$wp_hasher = new PasswordHash( 8, true );
	}
	$hashed = time() . ':' . $wp_hasher->HashPassword( $key );
	$wpdb->update( $wpdb->users, array( 'user_activation_key' => $hashed ), array( 'user_login' => $user->user_login ) );

	$switched_locale = switch_to_locale( get_user_locale( $user ) );

	/* translators: %s: user login */
	$message  = sprintf( __( 'Username: %s' ), $user->user_login ) . "\r\n\r\n";
	$message .= __( 'To set your password, visit the following address:' ) . "\r\n\r\n";
	$message .= '<' . network_site_url( "wp-login.php?action=rp&key=$key&login=" . rawurlencode( $user->user_login ), 'login' ) . ">\r\n\r\n";

	$message .= wp_login_url() . "\r\n";

	$wp_new_user_notification_email = array(
		'to'      => $user->user_email,
		/* translators: Login details notification email subject. %s: Site title */
		'subject' => __( '[%s] Login Details' ),
		'message' => $message,
		'headers' => '',
	);

	/**
	 * Filters the contents of the new user notification email sent to the new user.
	 *
	 * @since 4.9.0
	 *
	 * @param array   $wp_new_user_notification_email {
	 *     Used to build wp_mail().
	 *
	 *     @type string $to      The intended recipient - New user email address.
	 *     @type string $subject The subject of the email.
	 *     @type string $message The body of the email.
	 *     @type string $headers The headers of the email.
	 * }
	 * @param WP_User $user     User object for new user.
	 * @param string  $blogname The site title.
	 */
	$wp_new_user_notification_email = apply_filters( 'wp_new_user_notification_email', $wp_new_user_notification_email, $user, $blogname );

	wp_mail(
		$wp_new_user_notification_email['to'],
		wp_specialchars_decode( sprintf( $wp_new_user_notification_email['subject'], $blogname ) ),
		$wp_new_user_notification_email['message'],
		$wp_new_user_notification_email['headers']
	);

	if ( $switched_locale ) {
		restore_previous_locale();
	}
}