How to Verify Google reCAPTCHA v3 on the Server Side in PHP?
Oct 31, 2024 pm 01:18 PM
How to Verify Google reCAPTCHA v3 on the Server Side in PHP
Problem: You've implemented Google reCAPTCHA v3 with a checkbox on the front end, but you're facing difficulties validating it on the server side. The form is being submitted even when the captcha is invalid.
Solution:
To effectively handle Google reCAPTCHA v3 validation on the server side, it's crucial to use POST requests. Here's a solution:
<code class="php">function isValid()
{
try
{
$url = 'https://www.google.com/recaptcha/api/siteverify';
$data = [
'secret' => '[YOUR SECRET KEY]',
'response' => $_POST['g-recaptcha-response'],
'remoteip' => $_SERVER['REMOTE_ADDR']
];
$options = [
'http' => [
'header' => "Content-type: application/x-www-form-urlencoded\r\n",
'method' => 'POST',
'content' => http_build_query($data)
]
];
$context = stream_context_create($options);
$result = file_get_contents($url, false, $context);
return json_decode($result)->success;
}
catch (Exception $e)
{
return null;
}
}</code>
Explanation:
- The isValid() function is crafted to verify reCAPTCHA v3 using a POST request.
- It sends the secret key, captcha response, and user's IP address to Google's API.
- The function parses the API's response and returns true if the captcha is valid, false if it's invalid, and null if an error occurs during the request.
Usage:
In your code, simply write:
if (isValid()) {
// The user has passed the captcha validation.
} else {
// The user has failed the captcha validation.
}
Note: Ensure to replace [YOUR SECRET KEY] with your actual reCAPTCHA secret key in the provided code snippet.
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