How to catch/what to do with a WP Error Object

3 comments

1. 1. Assign return of the function to the variable.

   2. Check the variable with is_wp_error().

   3. If true handle accordingly, for example trigger_error() with message from WP_Error->get_error_message() method.

   4. If false – proceed as usual.

   Usage:

   function create_custom_post() {
     $postarr = array();
     $post = wp_insert_post($postarr);
     return $post;
   }
   
   $result = create_custom_post();
   
   if ( is_wp_error($result) ){
      echo $result->get_error_message();
   }
   

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2. Hei,

   first, you check weather your result is a WP_Error object or not:

   $id = wp_insert_post(...);
   if (is_wp_error($id)) {
       $errors = $id->get_error_messages();
       foreach ($errors as $error) {
           echo $error; //this is just an example and generally not a good idea, you should implement means of processing the errors further down the track and using WP's error/message hooks to display them
       }
   }
   

   This is the usual way.

   But the WP_Error object can be instanciated without any error occuring, just to act as a general error store just in case. If you want to do so, you can check if there are any errors by using get_error_code():

   function my_func() {
       $errors = new WP_Error();
       ... //we do some stuff
       if (....) $errors->add('1', 'My custom error'); //under some condition we store an error
       .... //we do some more stuff
       if (...) $errors->add('5', 'My other custom error'); //under some condition we store another error
       .... //and we do more stuff
       if ($errors->get_error_code()) return $errors; //the following code is vital, so before continuing we need to check if there's been errors...if so, return the error object
       .... // do vital stuff
       return $my_func_result; // return the real result
   }
   

   If you do that, you can then check for an process the returned error just as in the wp_insert_post() example above.

   The Class is documented on the Codex.
   And there’s also a little article here.

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3. $wp_error = wp_insert_post( $new_post, true); 
                                 echo '<pre>';
                                 print_r ($wp_error);
                                 echo '</pre>';
   

   This will show you exactly what’s wrong with wordpress post insert function. just try it !

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