RECAPTCHA

[j-tosi]

How do I integrate RECAPTCHA into my form?

[madriverweb]

Alternatively, I have used something like a honeypot for about 15 years. It works great and doesn't require connecting with Google. Right before the stop editing note, add:

if ( !empty( $_REQUEST['dummyField'] ) || $_REQUEST['dummyField'] != '' || !empty($_REQUEST['Reset']) || !empty($_REQUEST['reset']))
{
header( "Location: https://www.yourdomain.com" );
die( "Your submission wasn't sent." );
}

Then in your form, put the dummyField as a text field and hide it with CSS display: none;

If a bot fills out all fields, the form will not process.

If too many humans are spamming your forms, you may have to use the reCaptcha, but I have found this method VERY effective.