- var_dump: documentation ( source)
- json_decode: documentation ( source)
<?php
$json = '{"ok":"1","result": [{"update_id": "123", "message":{"message_id":"123","date":"1512046846","contact":{"first_name":"Mike","phone_number":"111-111-11111"}}}]}';
$update = json_decode($json);
var_dump($update);
echo "Phone: " . $update->result[0]->message->contact->phone_number;