note 104662 added to function.imagegd
| From: | rohitkumar at cftechno dot com | Date: | Wed, 29 Jun 2011 11:25:06 +0000 |
| Subject: | note 104662 added to function.imagegd | ||
| Groups: | php.notes | ||
| Request: | Send a blank email to php-notes+get-181034@lists.php.net to get a copy of this message | ||
<?php
/*
* Captcha image for security
*/
session_start();
class CaptchaSecurityImages {
var $font = 'monofont.ttf';
function generateCode($characters) {
/* list all possible characters, similar looking characters and vowels have been removed */
$possible = '23456789bcdfghjkmnpqrstvwxyz';
$code = '';
$i = 0;
while ($i < $characters) {
$code .= substr($possible, mt_rand(0, strlen($possible)-1), 1);
$i++;
}
return $code;
}
function
CaptchaSecurityImages($width='120',$height='40',$characters='6') {
$code = $this->generateCode($characters);
/* font size will be 75% of the image height */
$font_size = $height * 0.75;
$image = imagecreate($width, $height) or die('Cannot initialize new GD image
stream');
/* set the colours */
$background_color = imagecolorallocate($image, 255, 255, 255);
$text_color = imagecolorallocate($image, 20, 40, 100);
$noise_color = imagecolorallocate($image, 100, 120, 180);
/* generate random dots in background */
for( $i=0; $i<($width*$height)/3; $i++ ) {
imagefilledellipse($image, mt_rand(0,$width), mt_rand(0,$height), 1, 1, $noise_color);
}
/* generate random lines in background */
for( $i=0; $i<($width*$height)/150; $i++ ) {
imageline($image, mt_rand(0,$width), mt_rand(0,$height), mt_rand(0,$width),
mt_rand(0,$height), $noise_color);
}
/* create textbox and add text */
$textbox = imagettfbbox($font_size, 0, $this->font, $code) or die('Error in
imagettfbbox function');
$x = ($width - $textbox[4])/2;
$y = ($height - $textbox[5])/2;
imagettftext($image, $font_size, 0, $x, $y, $text_color, $this->font , $code) or
die('Error in imagettftext function');
/* output captcha image to browser */
header('Content-Type: image/jpeg');
imagejpeg($image);
imagedestroy($image);
$_SESSION['security_code'] = $code;
}
}
$width = isset($_GET['width']) && $_GET['width'] < 600 ?
$_GET['width'] : '120';
$height = isset($_GET['height']) && $_GET['height'] < 200 ?
$_GET['height'] : '40';
$characters = isset($_GET['characters']) && $_GET['characters'] > 2 ?
$_GET['characters'] : '6';
$captcha = new CaptchaSecurityImages($width,$height,$characters);
?>
----
Server IP: 202.65.157.132
Probable Submitter: 122.162.1.1
----
Manual Page -- http://www.php.net/manual/en/function.imagegd.php
Edit -- https://master.php.net/note/edit/104662
Del: integrated -- https://master.php.net/note/delete/104662/integrated
Del: useless -- https://master.php.net/note/delete/104662/useless
Del: bad code -- https://master.php.net/note/delete/104662/bad+code
Del: spam -- https://master.php.net/note/delete/104662/spam
Del: non-english -- https://master.php.net/note/delete/104662/non-english
Del: in docs -- https://master.php.net/note/delete/104662/in+docs
Del: other reasons-- https://master.php.net/note/delete/104662
Reject -- https://master.php.net/note/reject/104662
Search -- https://master.php.net/manage/user-notes.php