WordPress Plugin - Dynamically Generate Password and send in email Notification to Admin and New user

email_notification_customize.php

<?php
/*
Plugin Name: New Register Email Customizer
Description: Changes the copy in the email sent out to new users
Author: Mohammad Mursaleen
*/

// Redefine user notification function
if ( !function_exists('wp_new_user_notification') ) {

    function wp_new_user_notification( $user_id, $deprecated = null, $notify = '' ) {

        if ( $deprecated !== null ) {
            _deprecated_argument( __FUNCTION__, '4.3.1' );
        }

        $user = get_userdata( $user_id );

        // Generate password
        $password = wp_generate_password( 12, false );
        wp_set_password( $password, $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() );
            $message  = sprintf( __( 'New user registration on your site %s:' ), $blogname ) . "\r\n\r\n";
            $message .= sprintf( __( 'Username: %s' ), $user->user_login ) . "\r\n\r\n";
            $message .= sprintf( __( 'Email: %s' ), $user->user_email ) . "\r\n";
            $message .= sprintf( __( 'Password: %s' ), $password ) . "\r\n";
            @wp_mail( get_option( 'admin_email' ), sprintf( __( '[%s] New User Registration' ), $blogname ), $message );
            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;
        }

        $switched_locale = switch_to_locale( get_user_locale( $user ) );
        $message = sprintf(__('Username: %s'), $user->user_login) . "\r\n\r\n";
        $message .= get_home_url(). '/wp-login.php/' . "\n";
        $message .= sprintf(__('Username: %s'), $user->user_login) . "\n";
        $message .= sprintf(__('Password: %s'), $password ) . "\n\n";
        $message .= sprintf(__('If you have any problems, please contact us at %s.'), get_option('admin_email')) . "\n\n";

        wp_mail($user->user_email, sprintf(__('[%s] Your username and password info'), $blogname), $message);

        if ( $switched_locale ) {
            restore_previous_locale();
        }

    }
    
}