Contact Form 7: use hook created using wpcf7_before_send_mail for only one contact form by id

Question

I am working on a site with several forms created using Contact Form 7. For one of these forms, I am passing variables that I collected using a hidden input field in the fo

Answer 1

The methods for retrieving the form ID and submitted fields have changed in this plugin since 2015.

To get the form ID, you should use this:

$form_id = $contact_form->id();

To get the submission data you should use this (instead of $_POST):

$submission = WPCF7_Submission::get_instance();
$posted_data = $submission->get_posted_data();

To put it all together, your snippet would look like this:

add_action( 'wpcf7_before_send_mail', 'wpcf7_add_text_to_mail_body' );
function wpcf7_add_text_to_mail_body( $contact_form ) {

    //Get the form ID
    $form_id = $contact_form->id();

    //Do something specifically for form with the ID "123"
    if( $form_id == 123 ) {
        $submission = WPCF7_Submission::get_instance();
        $posted_data = $submission->get_posted_data();
        $values_list = $posted_data['valsitems'];
        $values_str = implode(", ", $values_list);

        // get mail property
        $mail = $contact_form->prop( 'mail' ); // returns array 

        // add content to email body
        $mail['body'] .= 'INDUSTRIES SELECTED';
        $mail['body'] .= $values_list;

        // set mail property with changed value(s)
        $contact_form->set_properties( array( 'mail' => $mail ) );
    }
}