markdown Recaptcha v3

Posted 2021-05-05

# Recaptcha v3
https://www.google.com/recaptcha/intro/v3.html

## PHP
### Define Keys
```php
define( 'SITE_KEY', '' );
define( 'SECRET_KEY', '' );
```

### Create Function
```php
function getCaptcha( $secret_key ) {
	$response = file_get_contents( "https://www.google.com/recaptcha/api/siteverify?secret=${SECRET_KEY}&response=${$secret_key}" );
	$return = json_decode( $response );
	return $return;
}

$captcha = getCaptcha($_POST['g-recaptcha-response']);
```

## HTML
```html
<input type="hidden" id="g-recaptcha-response" name="g-recaptcha-response">
```

## JavaScript
```js
<script src="https://www.google.com/recaptcha/api.js?render=<?php echo SITE_KEY; ?>"></script>
<script>
grecaptcha.ready(function() {
	grecaptcha.execute('<?php echo SITE_KEY; ?>', {action: 'homepage'}).then(function(token) {
		document.querySelector('#g-recaptcha-response').value = token;
	});
});
</script>
```