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Well-Handled Function Reference

Well-Handled includes wrappers to handle the heavy lifting. All you need to do is drop the right functions into the right places to make the magic happen.


See Also: Hooks & FiltersTemplates

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Sending Emails

The following functions exist to make sending Well-Handled emails a breeze.


Process a template and email it!

$response = wh_mail_template($template_slug, $data, $options);


  • (string|array) (required) $template_slug: the unique identifier for your template. A/B testing is baked in; just pass an array and the template will be randomly selected.
  • (array) (optional) $data: the data that should be used in key=>value format. If omitted or invalid, handlebar processing will be skipped (leaving {{these}} in place).
  • (array) (optional) $options: function parameters to override.


The following template processing options are available.

  • (bool) 'collapse_whitespace': contiguous whitespace shall be collapsed to a single horizontal space. Default: FALSE
  • (bool) 'css_inline': CSS found in <style> tags shall be copied to qualifying elements via their style attributes. Default: FALSE
  • (bool) 'debug': append a comment to the end of the document with details about its compilation. Default: WP_DEBUG
  • (string) 'link_target': all <a> elements shall use this target. Default: "_blank"
  • (bool) 'linkify': convert plain-text URLs, email addresses, and phone numbers to HTML links. Default: FALSE
  • (bool) 'snippet': process as an HTML snippet rather than a full document. This will prevent DOCTYPE and <html> tags from being added. Default: FALSE
  • (bool) 'strip_comments': Comments shall be removed. Default TRUE
  • (bool) 'strip_style_tags': All <style> tags shall be removed from the document. With css_inline enabled, <style> tags are mostly just bloat. Default TRUE
  • (bool) 'utm': append Google Urchin tracking tags defined in 'utm_data' to link URLs. Default FALSE
  • (array) 'utm_data': the UTM tracking data to append if 'utm' is TRUE. NULL or otherwise empty values are ignored. Default:
    • 'utm_campaign'=>$template_slug
    • 'utm_content'=>NULL
    • 'utm_medium'=>"email"
    • 'utm_source'=>"transactional"
    • 'utm_term'=>NULL
  • (bool) 'utm_local_only': UTM tracking tags shall only be added to links pointing to the local site. Default: TRUE
  • (bool) 'validate_html': Attempt to fix syntax errors and strip inappropriate content from the document, such as Javascript. It is strongly suggested this always be enabled. Default TRUE

The following options relate to the eventual email. They all work exactly like wp_mail(). The only wp_mail() argument that is not present is $message, as that is built automatically in this case.

  • (string|array) 'to': the e-mail recipient(s). The argument can be a string, an array, or a pretend array (comma-separated string). Recipients should follow RFC 2822 guidelines, e.g. john@doe.com or John Doe <john@doe.com>. Default: ``
  • (string) 'subject': the e-mail subject. Default: [Your Site Name] Your Template Name
  • (string|array) 'headers': additional headers, if any, to include with the email. The argument can be a CRLF-separated string or an array. Default NULL
  • (string|array) 'attachments': file(s) to attach. The argument accepts full file path(s). Default NULL
  • (bool) 'testmode': for WH Pro users, a value of TRUE will prevent the message from being logged. This only applies if data collection is enabled via the Settings page. Default: FALSE


  • (bool) TRUE if at least one recipient email was successfully sent. Note: this does indicate ultimate deliverability, just that the message was accepted by the sending server.
  • (bool) FALSE if the template could not be parsed or no valid recipients were included.


$data = array('firstname'=>'Anne');
$options = array(

if(false !== wh_mail_template('welcome-letter', $data, $options)) {
    echo 'Yay!';
else {
    echo 'Oops. Something went wrong.';


You can also use Well-Handled to send miscellaneous HTML emails or even template-derived messages that were precompiled. To make things easy, this function takes exactly the same arguments as wp_mail(), with one additional variable ($testmode) at the end for Pro users. See the documentation for wp_mail() or wh_mail_template() for more details.

if(false !== wh_mail($to, $subject, $message, $headers=null, $attachments=null, $testmode=false)) {
    echo 'Yay!';
else {
    echo 'Oops. Something went wrong.';


Take and email address and/or a name and smoosh it into a single "to" string that can be used as the recipient value when sending an email.

$email = 'john@doe.com';
$name = 'John Doe';
$to = wh_recipient($email, $name); // "John Doe" <john@doe.com>


  • (string) (required) $email: an email address.
  • (array) (optional) $name: a name.

Template Processing

You can render a template independently of sending an email with the following function.


Use this function to process the HTML from a Well-Handled template. It works exactly like wh_mail_template(), except you do not need to pass any email-related options.

$html = wh_get_template($template_slug, $data, $options);
{{ status.message }}