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 form. I am passing these variables into the email using the wpcf7_before_send_mail hook, but these values are passing into every email (I added dynamic variables as well as static text) Here's the code:

add_action( 'wpcf7_before_send_mail', 'wpcf7_add_text_to_mail_body' );

 function wpcf7_add_text_to_mail_body($contact_form){
     $values_list = $_POST['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 ) );

 }

I am trying to figure out how to only pass these values to one of the contact form email templates, probably via the form id.

Answer 1

Contact Form 7 uses hidden input type to store form id. It uses hidden field name _wpcf7. You can get the form Id like this way.

$form_id = $contact_form->posted_data['_wpcf7'];

So you final code should be

add_action( 'wpcf7_before_send_mail', 'wpcf7_add_text_to_mail_body' );

function wpcf7_add_text_to_mail_body($contact_form){
 $form_id = $contact_form->posted_data['_wpcf7'];
 if ($form_id == 123): // 123 => Your Form ID.
     $values_list = $_POST['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 ) );
 endif;

}

Hope this helps.

Answer 2

I was using Dinesh's answer, but it stopped working for me. Instead, I am now checking for a field that is unique to the form I'm submitting:

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

   $submission = WPCF7_Submission::get_instance();
   $posted_data = $submission->get_posted_data();
   if( !empty($posted_data["dealer_email"])){  //use a field unique to your form

       $email = trim($posted_data["dealer_email"]);
       // more custom stuff here
   }
}

Be sure to have at least one unique form name in each of your forms that you can use to do this. It might still be possible to get the form ID from $contact_form via a function, but this worked and I was content with the result.