86 lines
2.7 KiB
PHP
86 lines
2.7 KiB
PHP
<?php
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require_once('include/db_info.inc.php');
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//ob_clean()清除缓存区,否则有可能不显示gif
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ob_clean();
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/****************************************
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* 验证码 v0.9
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* Powerd by awaysoft.com
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* 本组件采用GPLv3发布
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* 2011-07-15
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****************************************/
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/* $len 为随机字符串长度，$type为类型，a为字符数字，c为字符,n为数字， 已经去除可能误导的字符 */
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function get_rand_string($len=4, $type="n"){
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if ($len < 0) $len = 4;
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if ($type == 'a') $chars = 'ABCDEFGHJKMNPQRSTUVWXYZabcdefghijkmnpqrstuvwxyz023456789';
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else if ($type == 'c') $chars = 'ABCDEFGHJKMNPQRSTUVWXYZabcdefghijkmnpqrstuvwxyz';
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else if ($type == 'n') $chars = '0123456789';
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else $chars = '0123456789';
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$result = '';
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for ($i = 0; $i < $len; $i ++){
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$index = mt_rand(0, strlen($chars) - 1);
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$result .= substr($chars, $index, 1);
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}
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return $result;
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}
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header("Expires: Mon, 26 Jul 1997 05:00:00 GMT");
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header("Last-Modified: ".gmdate("D, d M Y H:i:s")." GMT");
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header("Cache-Control: no-cache, must-revalidate");
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header("Pramga: no-cache");
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/* 输出图片类型，字符长度，类型 */
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$imgtype = 'gif';
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$len = 4;
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$vcodetype = 'n';
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if(isset($_SESSION[ $OJ_NAME . '_' . "vfail" ]) && $_SESSION[ $OJ_NAME . '_' . "vfail" ]){
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$len = 8;
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$vcodetype = 'c';
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}
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$width = 15 * $len;
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$height = 24;
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/* 生成随机字符串并写入SESSION */
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$vcode = get_rand_string($len, $vcodetype);
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$_SESSION[$OJ_NAME.'_'.'vcode'] = $vcode;
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header("Content-type: image/".$imgtype);
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if($imgtype != 'gif' && function_exists('imagecreatetruecolor')){
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$im = imagecreatetruecolor($width, $height);
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}else{
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$im = imagecreate($width, $height);
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}
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$r = mt_rand(0, 255);
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$g = mt_rand(0, 255);
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$b = mt_rand(0, 255);
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/* 生成背景颜色 */
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$backColor = ImageColorAllocate($im, $r, $g, $b);
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/* 生成边框颜色 */
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$borderColor = ImageColorAllocate($im, 0, 0, 0);
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/* 生成干扰点颜色 */
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$pointColor = ImageColorAllocate($im, mt_rand(0, 255), mt_rand(0, 255), mt_rand(0, 255));
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/* 背景位置 */
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imagefilledrectangle($im, 0, 0, $width - 1, $height - 1, $backColor);
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/* 边框位置 */
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imagerectangle($im, 0, 0, $width - 1, $height - 1, $borderColor);
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/* 字符串颜色(背景反色) */
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$stringColor = ImageColorAllocate($im, 255 - $r, 255 - $g, 255 - $b);
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/* 产生干扰点 */
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$pointNumber = mt_rand($len * 25, $len * 50);
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for($i=0; $i<=$pointNumber; $i++){
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$pointX = mt_rand(2,$width-2);
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$pointY = mt_rand(2,$height-2);
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imagesetpixel($im, $pointX, $pointY, $pointColor);
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}
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imagettftext($im, 15, 0, 4, 20, $stringColor, "include/Vera.ttf", $vcode);
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$image_out = 'Image' . $imgtype;
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$image_out($im);
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@ImageDestroy($im);
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?>
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