WebhookをHeroku PHPで受け取る！

<?php

$accessToken = 'ここだけ置き換えて！';

$jsonString = file_get_contents('php://input');

error_log($jsonString);

$jsonObj = json_decode($jsonString);

$message = $jsonObj->{"events"}[0]->{"message"};

$replyToken = $jsonObj->{"events"}[0]->{"replyToken"};

//受信メッセージを解析//

if ($message->{"type"} == 'text') {

              $textmessage = $message->{"text"};

              $replymessage = 'Receiving Message : '.$message->{"text"};

} else {

              $textmessage = 'Messege Receiving Error! invalid message type';

              $replymessage = 'Messege Receiving Error! invalid message type';

}

    $messageData = [

        'type' => 'text',

        'text' => $replymessage

    ];

//Salesforceに書き込み//

              $url = parse_url(getenv('DATABASE_URL'));

              $dsn = sprintf('pgsql:host=%s;dbname=%s', $url['host'], substr($url['path'], 1));

              $dbh = new PDO($dsn, $url['user'], $url['pass']);

              $dbh->setAttribute(PDO::ATTR_EMULATE_PREPARES, false);

              $dbh->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);

              $sql = "INSERT INTO salesforce.linemessage__c (message__c) VALUES (?)";

              $stmt = $dbh -> prepare($sql);

              $stmt->bindvalue(1, $textmessage, PDO::PARAM_STR);

              $stmt->execute();                                         

              $dbh = null;

//LINEにリプライ//

$response = [

    'replyToken' => $replyToken,

    'messages' => [$messageData]

];

error_log(json_encode($response));

$ch = curl_init('https://api.line.me/v2/bot/message/reply');

curl_setopt($ch, CURLOPT_POST, true);

curl_setopt($ch, CURLOPT_CUSTOMREQUEST, 'POST');

curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);

curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode($response));

curl_setopt($ch, CURLOPT_HTTPHEADER, array(

    'Content-Type: application/json; charser=UTF-8',

    'Authorization: Bearer ' . $accessToken

));

$result = curl_exec($ch);

error_log($result);

curl_close($ch);