Step 1 Generate a String of ramdom cheractors
Step 2 Store the generated String in a secession variable.
Step 3 Display generated string as an image in html forum.
function for image generation.
Over all usage
Step 4 Do some verification in form action.
function random_string()
{
$string="";
$c="";//Random char buffer
$i=0;
for($i=0;$i<=4;$i++)
{
$s = rand(65,90);//generates a random cheractor and store in $s
$string=$string.sprintf("%c",$s);//Can-cads random character to $string.
}
return $string;
} Step 2 Store the generated String in a secession variable.
session_start(); $_SESSION["key"]=random_string();
Step 3 Display generated string as an image in html forum.
function for image generation.
function generate_textimage($string)
{
$myImage = imagecreate(200, 50);
$myGray = imagecolorallocate($myImage, 250, 255, 255);
$black = imagecolorallocate($myImage, 0, 0, 0);
putenv('GDFONTPATH=' . realpath('.'));
$font='pirulen.ttf';
imagettftext($myImage, 25, 0, 20, 30, $black, $font, $string);
imagefilter($myImage, IMG_FILTER_GAUSSIAN_BLUR);
ob_start();
imagepng($myImage);
printf('<img src="data:image/png;base64,%s"/>',
base64_encode(ob_get_clean()));
imagedestroy($myImage);
}
Over all usage
<pre class="brush:[php];"><html>
<head>
<title></title>
</head>
<body>
<?php
require_once("huveri.php");
session_start();
//Generate Random String
$string = random_string();
$_SESSION["key"]=$string;
?>
<?php generate_textimage($string); ?>
<form action="vali.php" method="post">
<input type="text" name="key" />
<input type="submit" value="Submit" />
</form>
</body>
</html>
Step 4 Do some verification in form action.
<?php
session_start();
if($_SESSION["key"]==$_POST["key"])
{
echo "Wellcome Human";
}else {
echo "Your not Human";
}
session_destroy();
?>
