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POHow can I make my CAPTCHA script have a refresh link?
 

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  1. POHow can I make my CAPTCHA script have a refresh link?
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    <p>I have a captcha script and it works good. But, I don't know how to make it refresh. </p> <p>Here's <code>verificationimage.php</code>: </p> <pre><code>&lt;?php header('Content-type: image/jpeg'); $width = 50; $height = 24; $my_image = imagecreatetruecolor($width, $height); imagefill($my_image, 0, 0, 0xFFFFFF); // add noise for ($c = 0; $c &lt; 40; $c++){ $x = rand(0,$width-1); $y = rand(0,$height-1); imagesetpixel($my_image, $x, $y, 0x000000); } $x = rand(1,10); $y = rand(1,10); $rand_string = rand(1000,9999); imagestring($my_image, 5, $x, $y, $rand_string, 0x000000); setcookie('tntcon',(md5($rand_string).'a4xn')); imagejpeg($my_image); imagedestroy($my_image); ?&gt; </code></pre> <p>And, the page with the form:</p> <pre><code>&lt;label for="verif_box" style="margin-top:10px;"&gt;Image Verification:&lt;/label&gt; &lt;input name="verif_box" type="text" id="verif_box" autocomplete="off" minlength="4" maxlength="5" class="text" /&gt; &lt;img id="captcha" src="verificationimage.php?&lt;?php echo rand(0,9999);?&gt;" alt="This form can't be submitted because images aren't displayed" title="Verification image, type it in the box" width="50" height="24" align="absbottom" onclick="$('#verif_box').focus();" style="cursor:pointer;" /&gt; &amp;nbsp; (&lt;a href="#captcha" class="fancybox"&gt;what's this?&lt;/a&gt;) &lt;br /&gt; &lt;br /&gt; &lt;?php //if the variable "wrong_code" is sent from previous page then display the error field if(isset($_GET['wrong_code'])){?&gt; &lt;div style="border:1px solid #990000; background-color:#D70000; color:#FFFFFF; padding:4px; padding-left:6px;width:295px;"&gt;The code you entered does not match the image. Please try typing what you see in the image to the right again.&lt;/div&gt;&lt;br /&gt; &lt;?php ;} ?&gt; </code></pre> <p>Here is what happens in <code>mailer.php</code>: </p> <pre><code>// check to see if verificaton code was correct if(md5($verif_box).'a4xn' == $_COOKIE['tntcon']){ // if verification code was correct send the message and show this page mail("email@domain.com", 'New WeeBuild Support Ticket: '.$subject, $emailContent, $headers); mail($email, 'Thank you for contacting WeeBuild Support! (#'.$ticket.')', $emailContents, $headers2); // add to database $today = getdate(); $theDate = $today["weekday"].", ".$today["month"]." ".$today["mday"].", ".$today["year"]; mysql_select_db("database_name", $con); $sql="INSERT INTO table_name (name, email, subject, message, ticket, ip_address, created) VALUES ('$_POST[name]','$_POST[email]','$_POST[subject]','$_POST[message]','$ticket','$_SERVER[REMOTE_ADDR]','$theDate')"; if (!mysql_query($sql,$con)) { die('Error: ' . mysql_error()); } //close the database connection mysql_close($con); // delete the cookie so it cannot sent again by refreshing this page setcookie('tntcon',''); } else if(isset($message) and $message!=""){ // if verification code was incorrect then return to contact page and show error header("Location: index.php?name=$name&amp;subject=$subject&amp;email=".urlencode($email)."&amp;message=".urlencode($message)."&amp;wrong_code=true"); exit; } </code></pre> <p>It all currently works great, but how can I make the captcha refresh? I tried doing this:</p> <pre><code>&lt;script&gt; $(document).ready(function() { $('#refresh').click(function() { $('img#captcha').attr('src','verificationimage.php?&lt;?php echo rand(0,9999);?&gt;'); }); }); &lt;/script&gt; &lt;a href="#" id="refresh"&gt;refresh&lt;/a&gt; </code></pre> <p>But, it doesn't work. </p> <p>By the way, I don't want to use reCaptcha, I just rather do it this way because reCaptcha, to me, looks hard to set up with my stuff. </p>
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    1. COFrom a quick reading - you'll need to replace the `<?php echo rand` part with a javascript `Math.random`. The php random number is evaluated before the page even gets sent to the user; every time they click it, it'll give them the same number.
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      1. POHow can I make my CAPTCHA script have a refresh link?
      1. USSam Dufel
    2. CO@Sam Oh, thanks. I will try using `Math.random`. Hopefully it will work :)
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      1. USNathan
    3. CO@Sam Hmm, for some reason it wont work, you can see it here: http://weebuild.heliohost.org/
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      1. POHow can I make my CAPTCHA script have a refresh link?
      1. USNathan
 

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