Fixes ugly default mail when post field is of type array

Send prettier email in case <input type="radio" name="foo[]">

Author: Niq1982

inc/wplf-form-actions.php

@@ -25,6 +25,9 @@ function wplf_send_email_copy( $return ) {
       if( '_' === $key[0] ) {
         continue;
       }
+      if( is_array( $value ) ) { // in case input type="radio" submits an array
+        $value = implode( ', ', $value );
+      }
       $content .= esc_html( $key ) . ': ' . esc_html( print_r( $value, true ) ) . "\n";
     }