mirror of
https://github.com/WhatCD/Gazelle.git
synced 2024-12-13 19:06:27 +00:00
55 lines
1.6 KiB
PHP
55 lines
1.6 KiB
PHP
<?
|
|
if (!function_exists('imagettftext')) {
|
|
die('Captcha requires both the GD library and the FreeType library.');
|
|
}
|
|
|
|
function get_font() {
|
|
global $CaptchaFonts;
|
|
return SERVER_ROOT.'/classes/fonts/'.$CaptchaFonts[mt_rand(0, count($CaptchaFonts) - 1)];
|
|
}
|
|
|
|
function make_captcha_img() {
|
|
global $CaptchaBGs;
|
|
|
|
$Length = 6;
|
|
$ImageHeight = 75;
|
|
$ImageWidth = 300;
|
|
|
|
$Chars = 'abcdefghjkmprstuvwxyzABCDEFGHJKLMPQRSTUVWXY23456789';
|
|
$CaptchaString = '';
|
|
|
|
for ($i = 0; $i < $Length; $i++) {
|
|
$CaptchaString .= $Chars[mt_rand(0,strlen($Chars) - 1)];
|
|
}
|
|
|
|
for ($x = 0; $x < $Length; $x++) {
|
|
$FontDisplay[$x]['size'] = mt_rand(24, 32);
|
|
$FontDisplay[$x]['top'] = mt_rand($FontDisplay[$x]['size'] + 5, $ImageHeight - ($FontDisplay[$x]['size'] / 2));
|
|
$FontDisplay[$x]['angle'] = mt_rand(-30, 30);
|
|
$FontDisplay[$x]['font'] = get_font();
|
|
}
|
|
|
|
$Img = imagecreatetruecolor($ImageWidth, $ImageHeight);
|
|
$BGImg = imagecreatefrompng(SERVER_ROOT.'/captcha/'.$CaptchaBGs[mt_rand(0, count($CaptchaBGs) - 1)]);
|
|
imagecopymerge($Img, $BGImg, 0, 0, 0, 0, 300, 75, 50);
|
|
|
|
$ForeColor = imagecolorallocatealpha($Img, 255, 255, 255, 65);
|
|
|
|
for ($i = 0; $i < strlen($CaptchaString); $i++) {
|
|
$CharX = (($ImageWidth / $Length) * ($i + 1)) - (($ImageWidth / $Length) * 0.75);
|
|
imagettftext($Img,$FontDisplay[$i]['size'], $FontDisplay[$i]['angle'], $CharX,
|
|
$FontDisplay[$i]['top'], $ForeColor,
|
|
$FontDisplay[$i]['font'], $CaptchaString[$i]
|
|
);
|
|
}
|
|
|
|
header('Content-type: image/png');
|
|
imagepng($Img);
|
|
imagedestroy($Img);
|
|
|
|
return $CaptchaString;
|
|
}
|
|
|
|
$_SESSION['captcha'] = make_captcha_img();
|
|
?>
|