An image CAPTCHA

Submitted by:Jhon Brain

Date added:15 April, 2012

Category:PHP

PHP code example for an image CAPTCHA.

Tags: captcha

Code Snippet:

<?php
header("Content-type: image/png");
$string = "abcdefghijklmnopqrstuvwxyz0123456789";
for($i=0;$i<6;$i++){
$pos = rand(0,36);
$str .= $string{$pos};
}

$img_handle = ImageCreate (60, 20) or die ("Cannot Create image");
//Image size (x,y)
$back_color = ImageColorAllocate($img_handle, 255, 255, 255);
//Background color RBG
$txt_color = ImageColorAllocate($img_handle, 0, 0, 0);
//Text Color RBG
ImageString($img_handle, 31, 5, 0, $str, $txt_color);
Imagepng($img_handle);

session_start();
$_SESSION['img_number'] = $str;
?>
 
 

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