有时Google Recaptcha不会显示图片（但我们只会自动获得刻度线）

<form class="form-horizontal" id="ajax-contact-form1" action="" method="post" autocomplete="on" onsubmit="return myFunction()">
         <?php 
        require_once "recaptchalib.php";
        // your secret key
$secret = "xxxxxx";
 
// empty response
$response = null;

// check secret key
$reCaptcha = new ReCaptcha($secret);

// if submitted check response
 
if ($_POST["g-recaptcha-response"]) {
    $response = $reCaptcha->verifyResponse(
        $_SERVER["REMOTE_ADDR"],
        $_POST["g-recaptcha-response"]
    );
}
if ($response != null && $response->success) {
        
 
    // EDIT THE 2 LINES BELOW AS REQUIRED
 
    $email_to = "xxxx@gmail.com";
    $email_to2 = "xxxx@gmail.com";
    $email_to3 = "xxxx@outlook.com"; 
    $email_subject = "Play Of Paints Response";
 
    $success = false; 
 
  
  
    $first_name = $_POST['name']; // required
 
    
 
    $email_from = $_POST['email']; // required
 
    $telephone = $_POST['phone']; // not required
 
    $comments = $_POST['message']; // required
 
     
 
    $error_message = "";
 

 
    $email_message = "Devour...

";
 
     
 
    function clean_string($string) {
 
      $bad = array("content-type","bcc:","to:","cc:","href");
 
      return str_replace($bad,"",$string);
 
    }
 
     
 
    $email_message .= "Name: ".clean_string($first_name)."
";
 
     
    $email_message .= "Email: ".clean_string($email_from)."
";
 
    $email_message .= "Telephone: ".clean_string($telephone)."
";
 
    $email_message .= "Message: ".clean_string($comments)."
";
 
          
 
// create email headers
 
$headers = 'From: Play Of Paints<www.playofpaints.com>'.$email_to3."
".
 
'Reply-To: '.$email_to3."
" .
 
'X-Mailer: PHP/' . phpversion();
 
  @mail($email_to2, $email_subject, $email_message, $headers); 
  $success = mail($email_to, $email_subject, $email_message, $headers);

    echo nl2br("Hello " . $_POST["name"] . " (" . $_POST["email"] . "), thanks for submitting the form! 

<strong>You will be contacted shortly!</strong>");
    
  } else { echo "Please enter your details below";

}
?>

        <div class="control-group">
<br>
            <label class="control-label" for="inputName">Your full name:</label>
            <div class="controls">                      
             <input class="" type="text" id="contact_name" name="name" placeholder="Your full name:"  >
            </div>
        </div>

        <div class="control-group">
            <label class="control-label" for="inputEmail">Your email:</label>
            <div class="controls">                      
              <input class="" type="email" id="inputEmail" name="email" placeholder="Your email:" onBlur="if(this.value=='') this.value='Your email:'" onFocus="if(this.value =='Your email:' ) this.value=''" >
            </div>
        </div>

        <div class="control-group">
            <label class="control-label" for="inputPhone">Phone number:</label>
            <div class="controls">                      
              <input class="contact_phone" type="tel" id="inputPhone" name="phone" placeholder="Phone number:" onBlur="if(this.value=='') this.value='Phone number:'" onFocus="if(this.value =='Phone number:' ) this.value=''" >
            </div>
        </div>
<div class="control-group">
            <label class="control-label" for="inputPhone">City</label>
            <div class="controls">                      
              <input type="text" name="firstname" value="Bangalore" readonly>
            </div>
        </div>
        <div class="control-group">
            <label class="control-label" for="inputMessage">Message:</label>
            <div class="controls">                                          
              <textarea class="" id="contact_message" name="message" placeholder="Message:" ></textarea>
            </div>
        </div>

        <div class="g-recaptcha" data-sitekey="6LfaGhETAAAAAMtEMP_dYoU-AbgaHLedpMWGiQ-7"></div>
                 <br>
                
        <button type="submit" class="submit">submit</button>
    </form>