<?php
// your code goes here
$d1=new DateTime("2018-07-08");
$d2=new DateTime("2018-10-08");
$diff=$d2->diff($d1);
echo $diff->days;
PD9waHAKCi8vIHlvdXIgY29kZSBnb2VzIGhlcmUKCiRkMT1uZXcgRGF0ZVRpbWUoIjIwMTgtMDctMDgiKTsgCiRkMj1uZXcgRGF0ZVRpbWUoIjIwMTgtMTAtMDgiKTsgCiRkaWZmPSRkMi0+ZGlmZigkZDEpOyAKCmVjaG8gJGRpZmYtPmRheXM7