WeChat パブリック アカウント開発に PHP7.0 を使用するにはどうすればよいですか?

<?php
    $token = 'your_token';
    $signature = $_GET["signature"];
    $timestamp = $_GET["timestamp"];
    $nonce = $_GET["nonce"];
    $echostr = $_GET["echostr"];
    $tmpArr = array($token, $timestamp, $nonce);
    sort($tmpArr);
    $tmpStr = implode($tmpArr);
    $tmpStr = sha1($tmpStr);
    if($tmpStr == $signature){
        echo $echostr;
        exit;
    }
    $postStr = file_get_contents('php://input');
    if (!empty($postStr)){
        $postObj = simplexml_load_string($postStr, 'SimpleXMLElement', LIBXML_NOCDATA);
        $fromUsername = $postObj->FromUserName;
        $toUsername = $postObj->ToUserName;
        $msgType = $postObj->MsgType;
        $contentStr = $postObj->Content;
    }else{
        echo "";
        exit;
    }
?>

<?php
    if($msgType == 'text'){
            $contentStr = '你发送的消息内容是:' . $contentStr;
            $textTpl = '<xml>
            <ToUserName><![CDATA['.$fromUsername.']]></ToUserName>
            <FromUserName><![CDATA['.$toUsername.']]></FromUserName>
            <CreateTime>'.time().'</CreateTime>
            <MsgType><![CDATA[text]]></MsgType>
            <Content><![CDATA['.$contentStr.']]></Content>
            </xml>';
            echo $textTpl;
            exit;
        }
?>

<?php
    $template = array(
        'touser' => $openid,
        'template_id' => 'your_template_id',
        'url' => 'http://your_link',
        'data' => array(
            'first' => array('value' => 'first'),
            'keyword1' => array('value' => 'keyword1'),
            'keyword2' => array('value' => 'keyword2'),
            'keyword3' => array('value' => 'keyword3'),
            'remark' => array('value' => 'remark')
        )
    );
    $url = 'https://api.weixin.qq.com/cgi-bin/message/template/send?access_token=' . $access_token;
    $result = https_request($url,json_encode($template));