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CAPTCHA class

cromine87

By cromine87
in PHP Coding Help

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cromine87 Newbie

cromine87

Posted
Posted (edited)

I have been trying to create this captcha class and then display a captcha image to a webpage. My code has lots of issues I'm sure, but I was wondering if anyone could help me figure out what I am doing wrong. My current code is as follows:

 

 

<?php
 
class Captcha
{
private $teststring = '';
private $strlength = 0;
private $backcolor = 0;
private $textcolor = 0;
private $image = null;
 
function __construct($w=200,$l=50)
{
$this->image = imageCreate($w,$l);
}
 
private function defineCaptcha()
{
$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));
}
}
}
 
private function textToImage()
{
$randcolR = rand(100,230);
$randcolG = rand(100,230);
$randcolB = rand(100,230);
 
//initialize image $captcha is handle dimensions 200,50
$captcha = imageCreate(200,50);
$backcolor = imageColorAllocate($captcha, $randcolR, $randcolG, $randcolB);
$textcolor = imageColorAllocate($captcha, ($randcolR - 20), ($randcolG - 20), ($randcolB - 20));
 
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,$textcolor,FONT,substr($captchastr,($i-1),1));
}
 
}
 
private function drawEllipses()
{
for($i=1; $i<=4;$i++)
{
imageellipse($captcha,rand(1,200),rand(1,50),rand(50,100),rand(12,25),$textcolor);
}
 
for($i=1; $i<=4;$i++)
{
imageellipse($captcha,rand(1,200),rand(1,50),rand(50,100),rand(12,25),$backcolor);
}
}
 
private function finishingTouch()
{
$_SESSION['testString'] = $this->testString;
//Send the headers (at last possible time)
ob_start();
//header('Content-type: image/png');
//Output the image as a PNG 
 
//Delete the image from memory
//imageDestroy($this->image);
imagePNG($this->image);
$output = ob_get_contents();
ob_end_clean();
return  $output;
}
 
public function makeImage()
{
$this->defineCaptcha();
$this->textToImage();
$this->drawEllipses();
$this->finishIt();
}
}
?>
<?
session_start();
 
$myCaptcha = new Captcha();
 
//sentinal variable
$continue = true;
 
if(isset($_POST['submit']))
{
if($_POST['code'] == $_SESSION['captchastr'])
{
echo "Success!!";
$continue = false;
}
else
{
echo "Please try again!!";
$continue = true;
}
}
 
?>
<?
if($continue == true)
{
//this is the code to produce the image in the HTML
// calls the public method that creates validation image
$image = $myCaptcha->makeImage();
$image = base64_encode($image);
//heredoc to hold html output
//$image = $_SESSION['image'];
$outString = <<<EOF
<html>
<head>
<title>Reverse Turing Test</title>
</head>
<body>
<img src="data:image/png;base64, {$image}">
<form name="myform" action="" method="POST">
<input type="text" name="userInput" value="" /><br />
<input type="submit" name="submit" value="submit" />
</form>
</body>
</html>
EOF;
echo $outString;
}
?>
Edited by cromine87
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Hall of Famer Regular Member

Hall of Famer

Posted
Posted

Well if you are very new to PHP, congratulations, you are able to write decent OOPHP in just a short period of time. Keep up the excellent work, you will improve from an amateur to professional coder soon.

 

A friendly advice though, use netbeans or eclipse to load your script and it can detect syntax errors immediately for you. In most cases the blank page is caused by syntax errors, in a large program it may not be easily detectable. If there is no syntax error, you will have to enable error reporting and track the problem deep down.

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