add captcha html
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<head>
<script src="https://www.google.com/recaptcha/api.js" async="" defer=""></script>
</head>
<body>
<form id="some-id" action="PHP-FILE-URL-!!!" method="POST">
<input type="text" name="name" id="name" class="form-control" placeholder="Name">
<div class="g-recaptcha" data-sitekey="YOUR-KEY-FOR-HTML-!!!!"></div>
<button type="Submit">Send Message</button>
</form>
</body>
SECOND PART OF CODE search with "add captcha php"