How-to : https://blog.thrsh.net/328-clear-cloudflare-cache-api.html

cloudflare_yod.class.php

<?php
/*
Clear Cloudflare cache API
@cecekpawon - Fri Aug 14 10:16:39 2015
*/

class cloudflare_yod {
  private $api = "https://www.cloudflare.com/api_json.html";
  private $params = array("tkn"=>"", "email"=>"", "z"=>"");
  private $token;
  private $email;

  public function __construct()
  {
    $params = func_get_args();

    foreach ($params[0] as $key => $value) {
      if (array_key_exists($key, $this->params) && $value) {
        $this->params[$key] = $value;
      }
    }
  }

  private function seek($fields=array())
  {
    $fields = array_merge($this->params, $fields);

    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, $this->api);
    curl_setopt($ch, CURLOPT_POST, true);
    curl_setopt($ch, CURLOPT_POSTFIELDS, $fields);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    $result = curl_exec($ch);
    //$info = curl_getinfo($ch);
    curl_close($ch);

    return json_decode($result, true);
  }

  public function purge_file($url)
  {
    return $this->seek(
      array(
        "a" => "zone_file_purge",
        "url" => $url
      )
    );
  }

  public function purge_all()
  {
    return $this->seek(
      array(
        "a" => "fpurge_ts",
        "v" => 1
      )
    );
  }
}

?>