X（旧Twitter）の埋め込み用ポストをoEmbed APIで取得しWebサイトに半自動で表示する

<?php
require_once "../../blog/wp-config.php";
require_once "../../func_db.php";

$vars_db = get_db();
$touroku_ok = '';

if(strpos($_POST['in_x_url'],'?') !== false){
    $x_url_tmp = explode('?', $_POST['in_x_url']);
    $x_url = $x_url_tmp[0];
}else{
    $x_url = $_POST['in_x_url'];
}

$url = "https://publish.twitter.com/oembed?url=".$x_url."&maxwidth=300&lang=ja";

//cURLセッション初期化
$ch = curl_init();

//URL、オプション指定
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);

//情報取得
$res =  curl_exec($ch);

//結果
$x_post = json_decode($res);

//セッションを終了する
curl_close($ch);

if($x_post->author_url == "https://twitter.com/vars_axisent"){
    $kbn = 'VARS';
}elseif($x_post->author_url == "https://twitter.com/MikaVasofatum"){
    $kbn = 'MIKA';
}

$x_html = $x_post->html;

$sql = "UPDATE dt_x SET x_post = ? WHERE kbn = '{$kbn}'";
$stmt = $vars_db->prepare($sql);
$flag = $stmt->execute(array($x_html));
if ($flag){
    $touroku_ok = '登録ok';
}else{
    $touroku_ok = '登録失敗';
}

$vars_db = null;

echo $touroku_ok;

<?php
function get_db(){
    $dsn = "mysql:host=".DB_HOST.";dbname=".DB_NAME.";charset=".DB_CHARSET;
    try{
        // DB接続
        $db = new PDO($dsn, DB_USER, DB_PASSWORD);
    }catch (PDOException $e){
        echo "Error:".$e->getMessage();
        die();
    }
    return $db;
}