PHP获取微信通用Access token

官方文档
https://developers.weixin.qq.com/doc/offiaccount/Basic_Information/Get_access_token.html
https://developers.weixin.qq.com/doc/offiaccount/Basic_Information/getStableAccessToken.html

获取 Access token

$data['grant_type'] = 'client_credential';
$data['appid'] = $appid;
$data['secret'] = $appsecret;
$url = 'https://api.weixin.qq.com/cgi-bin/token?' . http_build_query($data);
$res = json_decode(file_get_contents($url), true);

$access_token_str = Db::name('config')->value('access_token');
$access_token_arr = json_decode($access_token_str, true);
$access_token = $access_token_arr['access_token'];
if ($access_token_arr['expires_in'] < time()) {
	$url = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=***&secret=***";
	$response = json_decode(file_get_contents($url), true);
	$access_token = $response['access_token'];
	$data['access_token'] = $access_token;
	$data['expires_in'] = time() + 7000;
	Db::name('config')
		->where('id', 1)
		->setField('access_token', json_encode($data));
}
return json(['code' => 200, 'token' => $access_token]);

获取 Stable Access token

/**
 * 发送post请求
 * @param string $url 请求地址
 * @param array $post_data post键值对数据
 * @return string
 */
function send_post($url, $post_data) {
    $postData = http_build_query($post_data);
    $options = array(
        'http' => array(
            'method' => 'POST',
            'header' => 'Content-type:application/x-www-form-urlencoded',
            'content' => $postData,
            'timeout' => 15 * 60 // 超时时间（单位:s）
        )
    );
    $context = stream_context_create($options);
    $result = file_get_contents($url, false, $context);

    return $result;
}

//使用方法
$data['grant_type'] = 'client_credential';
$data['appid'] = $appid;
$data['secret'] = $appsecret;
$url = 'https://api.weixin.qq.com/cgi-bin/stable_token';
$response = json_decode(send_post($url, json_encode($data)), true);
$access_token = $res['access_token'];