unhandy_data_functions.php

<?php

$data = ['likes' => 'Laravel'];
$object = new stdClass();
$object->name = 'Marcel';
$object->city = 'Hamburg';

if (property_exists($object, 'name')) {
   echo $object->name;
}

echo ' from ';

if (property_exists($object, 'city')) {
   echo $object->city;
}

echo ' likes ';

if (array_key_exists('likes', $data)) {
   echo $data['likes'];
}

if (!empty($data['not'])) {
   echo $data['not'];
} else {
   echo '!';
}

# Marcel from Hamburg likes Laravel!