cloudflare-purgecache.php

<?php
  $email = "youremail@example.com";
  $apikey = yourkey;
  $zoneid = yourzone;

  $ch = curl_init( 'https://api.cloudflare.com/client/v4/zones/' . $zoneid . '/purge_cache' );

  curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode(array('purge_everything' => true)) );
  curl_setopt($ch, CURLOPT_CUSTOMREQUEST, "DELETE");
  curl_setopt($ch, CURLOPT_HTTPHEADER, array(
    'Content-Type: application/json',
    'X-Auth-Email: ' . $email,
    'X-Auth-Key: ' . $apikey
  ));

  $result = curl_exec($ch);

  if (curl_errno($ch) != 0) {
    echo curl_errno($ch);
  }

  echo $result;

  curl_close($ch);