Alexa Poruch

<?
        $secret = 'DquEn!lw4j3k98SMS#sfud'; // придумываем ключ
        $key1 = microtime(true);
        $key2 = md5($key1.$secret);
        
        $sendData = array(
            'name' => $sUserName,
            'phone' => $sUserPhone,
            'station' => $sStationName,
            'key1' => $key1,
            'key2' => $key2,  
        );
        
        $oCurl = curl_init();
        curl_setopt($oCurl, CURLOPT_URL, "https://site.ru/request.php");
        curl_setopt($oCurl, CURLOPT_POST, true);
        curl_setopt($oCurl, CURLOPT_HEADER, false);
        curl_setopt($oCurl, CURLOPT_RETURNTRANSFER, false);
        curl_setopt($oCurl, CURLOPT_POSTFIELDS, $sendData);
        $result = curl_exec($oCurl);
        curl_close($oCurl);
?>

<?
$secret = 'DquEn!lw4j3k98SMS#sfud';

$key1 = $_POST['key1'];
$key2 = $_POST['key2'];

if(microtime(true) - $key1 > 300) die('Неверные ключи');
if($key2 != md5($key1.$secret)) die('Неверные ключи');

$name = strip_tags($_POST['name']);
$name = str_replace("\n", '', $name);
$name = str_replace(";", '', $name);
$name = trim($name); 

$phone = strip_tags($_POST['phone']);
$phone = str_replace("\n", '', $phone);
$phone = str_replace(";", '', $phone);
$phone = trim($phone);

$station = strip_tags($_POST['station']);
$station = str_replace("\n", '', $station);
$station = str_replace(";", '', $station);
$station = trim($station);

Замените это:
<img src="путь/к/картинке/картинка.png">
На это:
<img src-js="путь/к/картинке/картинка.png">

window.onload = () => {
   let images = document.querySelectorAll("img");
   for (let img of images) {
       img.src = img.getAttribute("src-js");
       img.removeAttribute("src-js");
   }
}