A refactoring challenge for Adam Wathan at Laracon 2016

Foreach-refactor.php

//this function returns entrymessage objects only if the entrymessage is a mesaage, and the internal message object isText.
//From Facebook messenger api
//Got parts refractories but couldn't work out how to return a collection of valid entrymessages with the double foreach. 
//Tried lots of combos of each/map/ and filter.

 public function textMessages()
    {
        $result = [];
        foreach ($this->entries as $entry) {
            foreach ($entry->messages as $entryMessage) {
                if ($entryMessage->isMessage) {
                    if ($entryMessage->message->isText)
                        $result[] = $entryMessage;
                }
            }
        }
        return collect($result);
    }