<div class="popup-form-field">
<script src='https://www.google.com/recaptcha/api.js'></script>
<div class="captha-block" id="captcha"></div>
</div>
<html>
<head>
<title>reCAPTCHA demo: Explicit render after an onload callback</title>
<script type="text/javascript">
var onloadCallback = function() {
grecaptcha.render('html_element', {
'sitekey' : 'your_site_key'
});
};
</script>
</head>
<body>
<form action="?" method="POST">
<div id="html_element"></div>
<br>
<input type="submit" value="Submit">
</form>
<script src="https://www.google.com/recaptcha/api.js?onload=onloadCallback&render=explicit"
async defer>
</script>
</body>
</html>
$current_time = urlEncode(date("Y-m-d")."T".date("H:i:s")."Z");
Например) Расширьте сознание. Костыль, Но вполне себе рабочий