Alerter middleman

middleman.php

<?php
    if ( isset($_POST['message']) ) {
        $url = 'https://api.pushover.net/1/messages.json';
        
        $data = array();
        $data['token'] = "YOUR PUSHOVER TOKEN";
        $data['user'] = "YOUR PUSHOVER USER ID";
        
        $data['message'] = $_POST['message'];
        if ( isset($_POST['title']) ) {
            $data['title'] = $_POST['title'];
        } else {
            $data['title'] = "Alert";
        }
        if ( isset($_POST['sound']) ) {
            $data['sound'] = $_POST['sound'];
        } else {
            $data['sound'] = "pushover";
        }
        $options = array(
            'http' => array(
                'header'  => "Content-type: application/x-www-form-urlencoded\r\n",
                'method'  => 'POST',
                'content' => http_build_query($data)
            )
        );
        
        $context  = stream_context_create($options);
        $result = file_get_contents($url, false, $context);
        
        echo "Done";
        
    } else {
        die("No data");
    }
?>