need easy to use captcha script

rhock_95 · September 9, 2007

I hope someone can help me..,

I am looking for a complete captcha script that actually works...I have tried just about every one I can by searching and none of them work out of the box...

I either get "header already sent..."errors OR the ones that "seem" to work DO NOT display the text (font) over top of the background image...

GD Support  enabled  
GD Version  bundled (2.0.15 compatible)  
FreeType Support  enabled  
FreeType Linkage  with TTF library  
GIF Read Support  enabled  
JPG Support  enabled  
PNG Support  enabled  
WBMP Support  enabled  
XBM Support  enabled

can anyond suggest a foolproof script?

AndyB · September 9, 2007

You're welcome to try mine - www.digitalmidget.com/php_noob/captcha.php

rhock_95 · September 9, 2007

no text appears over the background image ???

AndyB · September 9, 2007

no text appears over the background image ???

It actually works perfectly installed on my server - it looks as though your's is misconfigured or you were not able to install the script properly.

rhock_95 · September 9, 2007

what is it that you are suggesting may be "misconfigured? I don't have any problems with many other php scripts that access many different databases etc with out any errors or problems

I installed the scrip as directed by your document

rhock_95 · September 9, 2007

I think the previously mentioned problem is du to an older version of PHP...

I installed the script on a newer server (PHP 5.04) and the test page seems to work

however I need some advice on how to implement the security function on an existing form

here is the test page:

<?php
//error_reporting(E_ALL);
session_start();
if (isset($_POST['submit'])) {
// clean and check form inputs including the secure image code
    $name = trim(strip_tags($_POST['name']));
    $email = trim(strip_tags($_POST['email']));
    $comments = trim(strip_tags($_POST['comments']));
    $secure = strtoupper(trim(strip_tags($_POST['secure'])));
    $match = $_SESSION['captcha']; // the code on the image

// input error checking
    if ($name=="") {
        $err.= "Please provide your name<br/>";
    }
    if (!$email) {
        $err.= "Please provide your email address<br>";
    }
    if ($email) {
        if (!eregi("^[_a-z0-9-]+(\.[_a-z0-9-]+)*@[a-z0-9-]+(\.[a-z0-9-]+)*(\.[a-z]{2,3})$", $email)) {
            $err.= $email. " is not a valid email address.<br/>";
        }
    } 
    if ($comments=="") {
        $err.= "Please provide comments<br/>";
    }
    if (!$secure) {
        $err.= "No security code entered<br/>";
    }
    if (($secure!=$match) && ($secure!="")) {
        $err.= "Security code mismatch<br/>";
    }
    if ($err=="") {
    // success - input passed all tests
    echo "What you do with success is up to you.";
    exit();
    }
}
?>
<head>
<title>Trolls go away</title>
<style type="text/css">
body,td {
font-family:arial, helvetica, sans-serif;
background:#fff;
color:#000;
font-size:12px;
}
input, textarea {
background:#eee;
color:#000;
font-size:12px;
border:1px solid #000;   
}
</style>
</head>
<body>
<?php
if ($err!="") {
    echo "<strong>Form Error(s)</strong><br/>";
    echo "<font color='#cc3300'>". nl2br($err). "</font><br/>";
}
?>

<form name="captcha" method="post" action="<?php echo $_SERVER['SCRIPT_NAME'];?>">
<table cellpadding="3" cellspacing="2" style="border:1px dotted #666;">
<tr>
<td>Name:</td><td><input type="text" name="name" value="<?php echo $_POST['name'];?>"/></td>
</tr>
<tr>
<td>Email:</td><td><input type="text" name="email" value="<?php echo $_POST['email'];?>"/></td>
</tr>
<tr>
<td valign="top">Comments:</td><td><textarea rows="5" columns="30" name="comments"><?php echo $_POST['comments'];?></textarea></td>
</tr>
<tr>
<td>Security Code</td><td><input type="text" name="secure"/></td>
</tr>
<tr>
<td><img src="captcha_image.php" alt="security image" border="0"/></td><td><input type="submit" name="submit" value="Send"/></td>
</tr>
</table>
</form>
</body>
</html>

I need to use the security function on an existing form that calls a different php script (that searches a database)

AdRock · September 10, 2007

Here is the code for my capthca image I use saved as captcha .php

<?php
session_start();
$strlength = rand(4,7);
$captchastr = "";
for($i=1;$i<=$strlength;$i++)
{
$textornumber = rand(1,3);
if($textornumber == 1)
{
$captchastr .= chr(rand(49,57));
}
if($textornumber == 2)
{
$captchastr .= chr(rand(65,78));
}
if($textornumber == 3)
{
$captchastr .= chr(rand(80,90));
}
}
$randcolR = rand(100,230);
$randcolG = rand(100,230);
$randcolB = rand(100,230);

//initialize image $captcha is handle dimensions 200,50
$captcha = imageCreate(190,50);
$backcolor = imageColorAllocate($captcha, $randcolR, $randcolG, $randcolB);

$txtcolor = imageColorAllocate($captcha, ($randcolR - 60), ($randcolG - 60), ($randcolB - 60));
for($i=1;$i<=$strlength;$i++)
{

$clockorcounter = rand(1,2);
if ($clockorcounter == 1)
{
$rotangle = rand(0,45);
}
if ($clockorcounter == 2)
{
$rotangle = rand(315,360);
}

//$i*25 spaces the characters 25 pixels apart
imagettftext($captcha,rand(14,20),$rotangle,($i*25),30,$txtcolor,"/arial.ttf",substr($captchastr,($i-1),1));
}
for($i=1; $i<=4;$i++)
{
imageellipse($captcha,rand(1,200),rand(1,50),rand(50,100),rand(12,25),$txtcolor);
}
for($i=1; $i<=4;$i++)
{
imageellipse($captcha,rand(1,200),rand(1,50),rand(50,100),rand(12,25),$backcolor);
}
//Send the headers (at last possible time)
header('Content-type: image/png');

//Output the image as a PNG
imagePNG($captcha);

//Delete the image from memory
imageDestroy($captcha);

$_SESSION["captchastr"] = $captchastr;
?>

You neeed <?php session_start(); ?> at the beginning of the page where you are calling the capthca image

to display the capthca image you use

<img src="captcha.php" alt="security image" />

and i use something like this to check to see if the text field is empty of if the text matches the image

if (empty($_POST['verify']) && $_POST['verify'] == $_SESSION['captchstr'])
{
    $errmsg.="Please enter Anti-Spam key:<br />";
    $valid=false;
}

Sign In

need easy to use captcha script

Recommended Posts

rhock_95

Link to comment

Share on other sites

AndyB

Link to comment

Share on other sites

rhock_95

Link to comment

Share on other sites

AndyB

Link to comment

Share on other sites

rhock_95

Link to comment

Share on other sites

rhock_95

Link to comment

Share on other sites

AdRock

Link to comment

Share on other sites

Join the conversation

Browse

Activity

Important Information