Create custom welcome email without a plugin

3 comments

1. I’m afraid you’ll have to use the pluggable functions feature – there’s no filter or hook inside those functions (as you can see from the code below). And what’s worse, for you, it’s better to use pluggable function in a plugin.

   This is because defining new pluggable function in your theme’s functions.php requests you to use a definition of a new function in a function (in order to call it as soon as all plugins are fully loaded), which may be bad (see comments below this post), but on the other hand, it works – see code below the first one.

   For those who are not against plugins, here’s one which rewrites a pluggable function – just save it into my_plugin.php (or anything else) to you plugins directory and activate from your admin:

   <?php
   /*
   Plugin Name: Name Of The Plugin
   Plugin URI: http://URI_Of_Page_Describing_Plugin_and_Updates
   Description: A brief description of the Plugin.
   Version: The Plugin's Version Number, e.g.: 1.0
   Author: Name Of The Plugin Author
   Author URI: http://URI_Of_The_Plugin_Author
   License: A "Slug" license name e.g. GPL2
   */
   if( !function_exists('new_user_notification') ){
   function new_user_notifiaction(){
           /**
            * Notify the blog admin of a new user, normally via email.
            *
            * @since 2.0
            *
            * @param int $user_id User ID
            * @param string $plaintext_pass Optional. The user's plaintext password
            */
           function wp_new_user_notification($user_id, $plaintext_pass = '') {
               $user = get_userdata( $user_id );
   
               $user_login = stripslashes($user->user_login);
               $user_email = stripslashes($user->user_email);
   
               // 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);
   
               $message  = sprintf(__('New user registration on your site %s:'), $blogname) . "rnrn";
               $message .= sprintf(__('Username: %s'), $user_login) . "rnrn";
               $message .= sprintf(__('E-mail: %s'), $user_email) . "rn";
   
               @wp_mail(get_option('admin_email'), sprintf(__('[%s] New User Registration'), $blogname), $message);
   
               if ( empty($plaintext_pass) )
                   return;
   
               $message  = sprintf(__('Username: %s'), $user_login) . "rn";
               $message .= sprintf(__('Password: %s'), $plaintext_pass) . "rn";
               $message .= wp_login_url() . "rn";
   
               wp_mail($user_email, sprintf(__('[%s] Your username and password'), $blogname), $message);
   
           }
       }
   }
   

   Just if you’re curious, here a the same efect managed from functions.php with a new function defined inside another function:

   //redefine wp_new_user_notification as soon as all plugins are loaded
   add_action( 'plugins_loaded', 'new_user_notifiaction' );
   
   function new_user_notifiaction(){
       /**
        * Notify the blog admin of a new user, normally via email.
        *
        * @since 2.0
        *
        * @param int $user_id User ID
        * @param string $plaintext_pass Optional. The user's plaintext password
        */
       function wp_new_user_notification($user_id, $plaintext_pass = '') {
           $user = get_userdata( $user_id );
   
           $user_login = stripslashes($user->user_login);
           $user_email = stripslashes($user->user_email);
   
           // 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);
   
           $message  = sprintf(__('New user registration on your site %s:'), $blogname) . "rnrn";
           $message .= sprintf(__('Username: %s'), $user_login) . "rnrn";
           $message .= sprintf(__('E-mail: %s'), $user_email) . "rn";
   
           @wp_mail(get_option('admin_email'), sprintf(__('[%s] New User Registration'), $blogname), $message);
   
           if ( empty($plaintext_pass) )
               return;
   
           $message  = sprintf(__('Username: %s'), $user_login) . "rn";
           $message .= sprintf(__('Password: %s'), $plaintext_pass) . "rn";
           $message .= wp_login_url() . "rn";
   
           wp_mail($user_email, sprintf(__('[%s] Your username and password'), $blogname), $message);
   
       }
   }
   

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2. So I think the answer is no, you aren’t able to do this in a safe manner.

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3. This seems like a nice idea, which would also work in functions.php:

   // Add filter for registration email body
   add_filter('wp_mail','handle_wp_mail');
   
   function handle_wp_mail($atts) {
       /*"Your username and password" is the subject of the Email WordPress send from "function wp_new_user_notification" in file "wp-includes/pluggable.php"*/
   
       if (isset ($atts ['subject']) && substr_count($atts ['subject'],'Your username and password')>0 ) {
       if (isset($atts['message'])) {
          $atts['message'] = 'new body';
       }
       }
       return ($atts);
   }
   

   Just watch out for the language to get the right subject string.
   (Source: http://wordpress.org/support/topic/how-to-change-registration-email-content?replies=3)

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