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- <?php
- session_start();
- function randomText($length) {
- $pattern = "1234567890abcdefghijklmnopqrstuvwxyz";
- for($i=0;$i<$length;$i++) {
- $key .= $pattern{rand(0,35)};
- }
- return $key;
- }
- $_SESSION['tmptxt'] = randomText(8);
- $captcha = imagecreatefromgif("bgcaptcha.gif");
- $colText = imagecolorallocate($captcha, 0, 0, 0);
- imagestring($captcha, 5, 16, 7, $_SESSION['tmptxt'], $colText);
- header("Content-type: image/gif");
- imagegif($captcha);
- ?>
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