227 lines
6.7 KiB
PHP
227 lines
6.7 KiB
PHP
<?php
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//生成图像缩略图和生成验证码
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class Image {
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//生成图像验证码
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static public function buildImageVerify($width = 48, $height = 22, $randval = NULL, $verifyName = 'verify') {
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if (!isset($_SESSION)) {
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session_start();
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//如果没有开启，session，则开启session
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}
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$randval = empty($randval) ? ("" . rand(1000, 9999)) : $randval;
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$_SESSION[$verifyName] = $randval;
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$length = 4;
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$width = ($length * 10 + 10) > $width ? $length * 10 + 10 : $width;
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$im = imagecreate($width, $height);
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$r = array(225, 255, 255, 223);
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$g = array(225, 236, 237, 255);
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$b = array(225, 236, 166, 125);
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$key = mt_rand(0, 3);
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$backColor = imagecolorallocate($im, $r[$key], $g[$key], $b[$key]);
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//背景色（随机）
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$borderColor = imagecolorallocate($im, 100, 100, 100);
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//边框色
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$pointColor = imagecolorallocate($im, mt_rand(0, 255), mt_rand(0, 255), mt_rand(0, 255));
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//点颜色
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@imagefilledrectangle($im, 0, 0, $width - 1, $height - 1, $backColor);
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@imagerectangle($im, 0, 0, $width - 1, $height - 1, $borderColor);
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$stringColor = imagecolorallocate($im, mt_rand(0, 200), mt_rand(0, 120), mt_rand(0, 120));
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// 干扰
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for ($i = 0; $i < 10; $i++) {
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$fontcolor = imagecolorallocate($im, mt_rand(0, 255), mt_rand(0, 255), mt_rand(0, 255));
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imagearc($im, mt_rand(-10, $width), mt_rand(-10, $height), mt_rand(30, 300), mt_rand(20, 200), 55, 44, $fontcolor);
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}
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for ($i = 0; $i < 25; $i++) {
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$fontcolor = imagecolorallocate($im, mt_rand(0, 255), mt_rand(0, 255), mt_rand(0, 255));
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imagesetpixel($im, mt_rand(0, $width), mt_rand(0, $height), $pointColor);
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}
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for ($i = 0; $i < $length; $i++) {
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imagestring($im, 5, $i * 10 + 5, mt_rand(1, 8), $randval[$i], $stringColor);
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}
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self::output($im, 'png');
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}
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//生成缩略图
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static public function thumb($image, $thumbname, $domain = 'public', $maxWidth = 200, $maxHeight = 50, $interlace = true) {
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// 获取原图信息
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$info = self::getImageInfo($image);
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if ($info !== false) {
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$srcWidth = $info['width'];
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$srcHeight = $info['height'];
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$type = strtolower($info['type']);
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$interlace = $interlace ? 1 : 0;
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unset($info);
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$scale = min($maxWidth / $srcWidth, $maxHeight / $srcHeight);
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// 计算缩放比例
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if ($scale >= 1) {// 超过原图大小不再缩略
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$width = $srcWidth;
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$height = $srcHeight;
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} else {// 缩略图尺寸
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$width = (int)($srcWidth * $scale);
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$height = (int)($srcHeight * $scale);
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}
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// 载入原图
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$createFun = 'ImageCreateFrom' . ($type == 'jpg' ? 'jpeg' : $type);
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$srcImg = $createFun($image);
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//创建缩略图
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if ($type != 'gif' && function_exists('imagecreatetruecolor')) {
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$thumbImg = imagecreatetruecolor($width, $height);
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} else {
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$thumbImg = imagecreate($width, $height);
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}
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// 复制图片
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if (function_exists("ImageCopyResampled")) {
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imagecopyresampled($thumbImg, $srcImg, 0, 0, 0, 0, $width, $height, $srcWidth, $srcHeight);
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} else {
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imagecopyresized($thumbImg, $srcImg, 0, 0, 0, 0, $width, $height, $srcWidth, $srcHeight);
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}
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if ('gif' == $type || 'png' == $type) {
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$background_color = imagecolorallocate($thumbImg, 0, 255, 0);
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// 指派一个绿色
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imagecolortransparent($thumbImg, $background_color);
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// 设置为透明色，若注释掉该行则输出绿色的图
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}
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// 对jpeg图形设置隔行扫描
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if ('jpg' == $type || 'jpeg' == $type) {
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imageinterlace($thumbImg, $interlace);
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}
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$dir = dirname($thumbname);
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if (!is_dir($dir)) {
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@mkdir($dir, 0777, true);
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}
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// 生成图片
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$imageFun = 'image' . ($type == 'jpg' ? 'jpeg' : $type);
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$imageFun($thumbImg, $thumbname);
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imagedestroy($thumbImg);
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imagedestroy($srcImg);
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return $thumbname;
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}
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return false;
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}
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/**
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* 图片水印
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* @$image 原图
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* @$water 水印图片
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* @$$waterPos 水印位置(0-9) 0为随机，其他代表上中下9个部分位置
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*/
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static public function water($image, $water, $waterPos = 9) {
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//检查图片是否存在
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if (!file_exists($image) || !file_exists($water))
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return false;
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//读取原图像文件
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$imageInfo = self::getImageInfo($image);
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$image_w = $imageInfo['width'];
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//取得水印图片的宽
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$image_h = $imageInfo['height'];
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//取得水印图片的高
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$imageFun = "imagecreatefrom" . $imageInfo['type'];
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$image_im = $imageFun($image);
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//读取水印文件
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$waterInfo = self::getImageInfo($water);
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$w = $water_w = $waterInfo['width'];
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//取得水印图片的宽
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$h = $water_h = $waterInfo['height'];
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//取得水印图片的高
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$waterFun = "imagecreatefrom" . $waterInfo['type'];
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$water_im = $waterFun($water);
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switch ($waterPos) {
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case 0 :
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//随机
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$posX = rand(0, ($image_w - $w));
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$posY = rand(0, ($image_h - $h));
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break;
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case 1 :
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//1为顶端居左
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$posX = 0;
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$posY = 0;
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break;
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case 2 :
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//2为顶端居中
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$posX = ($image_w - $w) / 2;
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$posY = 0;
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break;
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case 3 :
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//3为顶端居右
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$posX = $image_w - $w;
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$posY = 0;
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break;
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case 4 :
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//4为中部居左
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$posX = 0;
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$posY = ($image_h - $h) / 2;
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break;
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case 5 :
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//5为中部居中
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$posX = ($image_w - $w) / 2;
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$posY = ($image_h - $h) / 2;
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break;
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case 6 :
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//6为中部居右
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$posX = $image_w - $w;
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$posY = ($image_h - $h) / 2;
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break;
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case 7 :
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//7为底端居左
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$posX = 0;
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$posY = $image_h - $h;
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break;
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case 8 :
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//8为底端居中
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$posX = ($image_w - $w) / 2;
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$posY = $image_h - $h;
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break;
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case 9 :
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//9为底端居右
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$posX = $image_w - $w;
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$posY = $image_h - $h;
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break;
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default :
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//随机
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$posX = rand(0, ($image_w - $w));
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$posY = rand(0, ($image_h - $h));
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break;
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}
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//设定图像的混色模式
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imagealphablending($image_im, true);
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imagecopy($image_im, $water_im, $posX, $posY, 0, 0, $water_w, $water_h);
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//拷贝水印到目标文件
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//生成水印后的图片
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$bulitImg = "image" . $imageInfo['type'];
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$bulitImg($image_im, $image);
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//释放内存
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$waterInfo = $imageInfo = null;
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imagedestroy($image_im);
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}
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static protected function getImageInfo($img) {
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$imageInfo = getimagesize($img);
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if ($imageInfo !== false) {
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$imageType = strtolower(substr(image_type_to_extension($imageInfo[2]), 1));
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$imageSize = filesize($img);
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$info = array("width" => $imageInfo[0], "height" => $imageInfo[1], "type" => $imageType, "size" => $imageSize, "mime" => $imageInfo['mime']);
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return $info;
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} else {
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return false;
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}
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}
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static protected function output($im, $type = 'png', $filename = '') {
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header("Content-type: image/" . $type);
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$ImageFun = 'image' . $type;
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if (empty($filename)) {
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$ImageFun($im);
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} else {
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$ImageFun($im, $filename);
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}
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imagedestroy($im);
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exit ;
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}
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}
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?>
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