php: pixiv login get ranking html

ranking.php

<?php

/***********************************/
define('TEMP_DIR', sys_get_temp_dir());
/***********************************/
define('APP_NAME', 'pixiv');
define('APP_COOKIE_FILE', TEMP_DIR . '/cookie_' . APP_NAME . '.txt');
/***********************************/
define('PIXIV_LOGIN_URL', 'https://www.secure.pixiv.net/login.php');
define('PIXIV_BASE_URL', 'http://www.pixiv.net/');
define('PIXIV_RANKING_URL', PIXIV_BASE_URL . 'ranking.php');
/***********************************/
define('PIXIV_ID', 'USER_ID');
define('PIXIV_PW', 'PASSWORD');
/***********************************/


function login()
{
	$request = array('pixiv_id' => PIXIV_ID, 'pass' => PIXIV_PW, 'mode' => 'login');

	$ch = curl_init();
	curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);
	curl_setopt($ch, CURLOPT_FOLLOWLOCATION, TRUE);
	curl_setopt($ch, CURLOPT_URL, PIXIV_LOGIN_URL);
	curl_setopt($ch, CURLOPT_POST, TRUE);
	curl_setopt($ch, CURLOPT_POSTFIELDS, $request);
	curl_setopt($ch, CURLOPT_COOKIEJAR, APP_COOKIE_FILE);
	curl_exec($ch);
	curl_close($ch);
}

function ranking()
{
	$ch = curl_init();
	curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);
	curl_setopt($ch, CURLOPT_URL, PIXIV_RANKING_URL);
	curl_setopt($ch, CURLOPT_COOKIEFILE, APP_COOKIE_FILE);
	$html = curl_exec($ch);
	curl_close($ch);
	return $html;
}

login(); // 最初だけ
$html = ranking();
echo $html;