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<?php
echo "<pre>";
print_r($_POST);
echo "</pre>";

$captcha=$_POST['g-recaptcha-response'];

//$secretKey = "6LfkzgoUAAAAAEkTzHmO_Bsu2UFI8vQPNajAKtdH"; // checkbox
$secretKey = "6LdKQsoUAAAAAKwFbiUziGNAU5XFmwAGjxf5WbHk"; // invi
$ip = $_SERVER['REMOTE_ADDR'];

$response = file_get_contents("https://www.google.com/recaptcha/api/siteverify?secret=".$secretKey."&response=".$captcha."&remoteip=".$ip);
print_r("https://www.google.com/recaptcha/api/siteverify?secret=".$secretKey."&response=".$captcha."&remoteip=".$ip);
$responseKeys = json_decode($response,true);

if(intval($responseKeys["success"]) !== 1) {
    echo '°ËÁõÀ» Åë°úÇÏÁö ¸øÇß½À´Ï´Ù.';
} else {
    echo $responseKeys;
    echo '°ËÁõÀ» Åë°ú Çß½À´Ï´Ù.';
}
?>