English string gets 'escaped'

[Beee4life]

I have a cron job which sends a email when certain conditions are met.
For some reason the string in Dutch (which is the default language) shows 'normally', while the English string is escaped/transformed in some way, making it unreadable/not showing.

The cron job works without issues, which is the function below. SHown for reference.

function sd_cron_remind_user_eot() {

    $users = [ 59, 73 ]; // just some random user ids for example

    foreach ( $users as $user ) {
        // stored preferred language for user. Can be NL | EN (is always set)
        $preferred_language = get_user_meta( $user_id, 'sd8_preferred_language', true );

        if ( ICL_LANGUAGE_CODE != $preferred_language ) {
            if ( 'nl' == ICL_LANGUAGE_CODE ) {
                add_filter( 'acf/settings/current_language', function() {
                    return $preferred_language;
                } );
            } elseif ( $preferred_language == ICL_LANGUAGE_CODE ) {
                add_filter( 'acf/settings/current_language', function() {
                    return 'nl';
                } );
            }
        }

        // get subject from ACF fields
        $email_subject = get_field( 'sd_eot_reminder_email_subject', 'option' );
        $email_message = get_field( 'sd_eot_reminder_email_company', 'option' );

        // switch back to default language
        add_filter( 'acf/settings/current_language', function () {
            global $sitepress;
            return $sitepress->get_default_language();
        } );

        // if user has not been informed yet
        if ( false == get_user_meta( $user_id, 'sd8_informed_eot', true ) ) {
            // if user has not set the setting to not receive email
            if ( false == get_user_meta( $user_id, 'no_emails', true ) ) {
                error_log($email_subject);
                // This outputs correctly every time (in both languages)

                do_action( 'sd_email_user', $user_id, false, $email_subject, $email_message, $preferred_language );
                // hook to trigger email function (see below)
            }
        }
    }
}
add_action( 'sd_orders_eot_reminder', 'sd_cron_remind_user_eot' );

do_action( 'sd_email_user' ) triggers the function below.

function sd_email_user_hook( $user_id, $post_id = 0, $email_subject, $email_message, $language = false ) {

    // needed to get the permalink in the correct language
    if ( false != $language ) {
        if ( ICL_LANGUAGE_CODE != $language ) {
            if ( 'nl' == ICL_LANGUAGE_CODE ) {
                add_filter( 'acf/settings/current_language', function() {
                    return 'en';
                } );
            } elseif ( 'en' == ICL_LANGUAGE_CODE ) {
                add_filter( 'acf/settings/current_language', function() {
                    return 'nl';
                } );
            }
        }
    }

    $post_author_data = get_userdata( $user_id );
    $to               = $post_author_data->user_email;
    $custom_message   = b3_replace_template_styling( $email_message );
    $custom_message   = strtr( $custom_message, b3_replace_email_vars( [] ) );
    $custom_message   = htmlspecialchars_decode( stripslashes( $custom_message ) );
    $from_email       = ( false != get_field( 'sd_support_email', 'option' ) ) ? get_field( 'sd_support_email', 'option' ) : 'support@email.com';
    $headers[]        = 'From: Site name <' . $from_email . '>' . "\r\n";
    $headers[]        = 'Content-Type: text/html; charset=UTF-8';

    $replace_vars = array(
        '%account_page%'  => b3_get_account_url(),
        '%profile_url%'   => get_permalink( $post_id ),
    );
    $custom_message = strtr( $custom_message, $replace_vars );

    add_filter( 'acf/settings/current_language', function () {
        global $sitepress;
        return $sitepress->get_default_language();
    } );

    // send email to user
    if ( false == get_user_meta( $user_id, 'no_emails', true ) ) {
        error_log($email_subject); // always outputs the correct string
        wp_mail( $to, $email_subject, $custom_message, $headers );
    }
}
add_action( 'sd_email_user', 'sd_email_user_hook', 10, 5 );

Site lang: NL/EN + User lang: NL
Correct subject in correct language

See image below.

Site lang: NL/EN + User lang: EN
Escaped subject

See image below.

My setup

• Docker container with Mailhog installed
• Wordpress with (relevant) plugins ACF and WPML (both latest pro versions)

EDIT: not sure if this is actually caused by Mailhog or by Phpmailer. Will also raise it as ticket there.

[Beee4life]

After more research I learned the ENTIRE string, including encoding/charset shouldn't be more than 85 characters, not the raw subject.

Mine is 86, so that explains it.

[dregad]

@Beee4life you are probably hitting the same bug I reported earlier, see #282

[Beee4life]

@dregad my subject was 1 character to long, so I trimmed it now it works.