Calculate the total number of comments posted last year from Diqus exported XML file.

sum.php

<?php
/**
 * @Author: printempw
 * @Date:   2017-01-10 22:44:20
 * @Last Modified by:   printempw
 * @Last Modified time: 2017-01-10 23:09:35
 */

$xmlString = file_get_contents('./blessing-studio-2017-01-10T14_38_39.483395-all.xml');

$xml = new SimpleXMLElement($xmlString);

$sum = 0;

foreach ($xml->post as $post) {
    // do not add my comments in
    if (strtotime($post->createdAt) > 1451631600 && $post->author->name != 'printempw') {
        // print_r($post);
        $sum++;
    }
}

exit("Total comments number of last year: $sum \n");