【LINE Messaging API】以 user id 查詢 user name

 
<php?
date_default_timezone_set('Asia/Taipei');
$sRootDir = $_SERVER['DOCUMENT_ROOT'];
$channelAccessToken = '您的 channel Access Token';
$bodyMsg = file_get_contents('php://input');

// LINE 不會幫我們記錄, 所以要自己寫 log
// 這段不是必要, 只是方便自己除錯
$sLogfile = 'log_'.date('Ymd').'.log';    // 指定 log 檔名, 一天一個檔, 檔名格式為: log_yyyymmdd.log
$fp = fopen($sLogfile, "a+");
fwrite($fp , print_r(date('Y-m-d H:i:s').', Recive: '.$bodyMsg."\n", true));
fclose($fp);

$obj = json_decode($bodyMsg, true);
$payload = null;
$event = null;

foreach ($obj['events'] as &$event)
{
    switch($event['type'])
    {
        // 如果您有在 LINE 官方帳號後台設定 歡迎詞, 
        // user 加入好友後也會收到
        case 'follow':
            // user 加入好友後, 程式自己要做的事
            $userId = $event['source']['userId'];
            $sUsername = getUsername($sUser);
            break;
            
        ...
        ...
    }        
}

function getUsername($user_id) {
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, "https://api.line.me/v2/bot/profile/$user_id");
    curl_setopt($ch, CURLOPT_HTTPHEADER, [  'Content-Type: application/json',
                                            'Authorization: Bearer ' . $GLOBALS['channelAccessToken']
                                        ]);
    curl_setopt($ch, CURLOPT_CUSTOMREQUEST, 'GET');
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
    $result = curl_exec($ch);
    curl_close($ch);

    if ($result===false) {
		// 查詢失敗, 
        return 'NG';
    }

    $data = json_decode($result, true);
    return $data["displayName"];
}
?>