contacts.php

<?php 
   public function getContactByKey($key) {
        $collection = null;
        
        if($this->getContact()){
            $collection = $this->getContact()->filter(function($element) use($key) {return ($element->getKey() === $key) ? $element : null;});
            if($collection->current()) 
                return $collection->current()->getValue();
        }
        return null;
    }
    

    public function getContactByKey($key) {
        $collection = null;

        if($this->getContact()){
            foreach($this->getContact() as $contact) {
                if($contact->getKey() === $key)
                    return $contact->getValue();
            }
        }
        return null;
    }
?>