wpmem_email_filter advanced example

/**
 * While this may seem a little complex as an example, it
 * is intended to give you an idea of the values that are
 * passed to this filter.  Since some of the data pieces
 * are dependent on the custom fields you have created
 * in your installation, the values may differ from
 * site to site based on your settings.
 *
 * What this example does is take the three arrays that come
 * through the filter (one required, two optional), puts the 
 * data in those arrays into a readable format, and replaces
 * the default email body with the values in these arrays.
 *
 * If you test register with this filter in place, you should
 * receive an email containing the values in these arrays
 * when you completed the registration - that will give you an
 * idea of what data is available to you to be used in
 * your own filter functions.
 */
add_filter( 'wpmem_email_filter', 'my_email_filter', 10, 3 );
function my_email_filter( $email, $wpmem_fields, $field_data ){

    /*
     * Use some of the settings in $email to turn off some
     * things we don't need for this:
     * * do_shortcodes = false (otherwise when display the
     *   keys for the last array, the key values would be
     *   parsed by the shortcode parser.
     * * add_footer = false (we don't need it for the 
     *   example; besides, this is a good example of
     *   toggleing one of the settings.
     */
    $email['do_shortcodes'] = false;
    $email['add_footer']    = false;

    // Give our email a new subject.
    $email['subj'] = 'Test Registration Email (arrays)';
    
    // Start with an empty variable for our new body content.
    $body = '';
    
    /*
     * This parses through the main $arr array and puts the contents
     * into a format for reading in the resulting email.
     */
    $body .= 'MAIN $arr CONTAINS THE FOLLOWING: ' . "\r\n\r\n";
    foreach ( $email as $key => $val ) {
        $body .= '[' . $key . '] => ' . $val . "\r\n";
    }
    
    /*
     * This parses through the contents of the $wpmem_fields array 
     * and adds this content to the email body. Each of the values
     * is also an array, so this loops though those as well.
     *
     * Note that this array is passed optionally to the filter. It
     * is only there to provide possible data you may want to have 
     * when filtering the main email array $arr.
     */
    $body .= "\r\n\r\n" 
        . 'WP-Members FIELDS $wpmem_fields CONTAINS THE FOLLOWING: ' 
        . "\r\n\r\n";
    foreach ( $wpmem_fields as $key => $val ) {
        $body .= '[' . $key . '] => array(' . "\r\n";
        foreach ( $val as $sub_key => $sub_val ) {
            $body .= "\t" . '[' . $sub_key . '] => ' . $sub_val . "\r\n";
        }
        $body .= ')' . "\r\n";
    }
    
    /*
     * This parses through the contents of the $field_data array 
     * and adds it to the new email body in a readable way.
     *
     * Note that this array is passed optionally to the filter. It
     * is only there to provide possible data you may want to have 
     * when filtering the main email array $arr.  This example tests
     * to see if this a new registration email and only adds this
     * if it is.
     */
    if ( 'newreg' == $email['tag'] ) {
        $body .= "\r\n\r\n" 
            . 'FIELD DATA ARRAY $field_data CONTAINS THE FOLLOWING: ' 
            . "\r\n\r\n";
        foreach ( $field_data as $key => $val ) {
            $body.= '[' . $key . '] => ' . $val . "\r\n";
        }
    }
    
    // Make the body of the email our new body that we just built out of all the arrays.
    $email['body'] = $body;
    

    // Return our filtered results.
    return $email;
}