PHP
Captcha Demo
Since we Know Captcha is very
Important for our site to prevent our site from misuse or spamming
then we will use captcha then attackers or bots not spam in our
site.Lets start Creating PHP Captcha for our site.
First : form.php
Code
:
<html>
<head>
<title>Check
It</title></head>
<body>
<form
action="val.php"
method="post">
<img
src="captcha.php">
</br>
Enter Image Text
<input
type="text" name="cap">
</br>
<input
type="submit" name="s"
value="Submit">
</form>
</body>
</html>
This is
simple html form where we print our captcha and input box for captcha
value input then we validate its true or false.
Second
: captcha.php
Code
:
<?php
session_start();
//Starting Session
$code=rand(100000,999999);
//Random Number
$_SESSION['code']=$code;
//Storing Captcha vallue in session
$im=imagecreatetruecolor(100,40);
$bg=imagecolorallocate($im,80,60,165);
$fg=imagecolorallocate($im,50,255,255);
imagefill($im,5,5,$bg);
imagestring($im,20,30,10,$code,$fg);
//Creating
Image in Png fomat
header('content-type:image/png');
imagepng($im);
imagedestroy($im);
//Destroying
Image
?>
This is
Captcha generating page it generates captcha in png image format and
store captcha value in session then we check the session captcha
value and user captcha value are same or not.
Third
: val.php
Code:
<?php
session_start();
$a=$_POST['cap'];
//receiving cap value from form
$b=$_SESSION['code'];
//Getting
Captcha Value from Session
//Comparing
User Captcha value and Session Value
if(isset($a)
&& $a !="" && $b==$a)
{
echo
"correct code enter"; //True
Captcha
}
else
{
die
("wrong code entered");
//False
Captcha
}
?>
In The
Last Page val.php we check captcha is true or false.
Thank
You
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