写一个php代码接收第三方推送的component_verify_ticket后返回字符串 success，然后获取component_access_token并储存到一个新建文件加

<?php
$component_verify_ticket = $_REQUEST['component_verify_ticket'];
$component_access_token = getComponentAccessToken($component_verify_ticket);
file_put_contents('component_access_token.txt', $component_access_token);
echo 'success';function getComponentAccessToken($component_verify_ticket){
//TODO: 获取component_access_token
}
?>