php图像处理类实例
发布:smiling 来源: PHP粉丝网 添加日期:2021-06-14 14:34:57 浏览: 评论:0
这篇文章主要介绍了php图像处理类,涉及php操作图片的大小修改、加水印、生成验证码、输出及保存图像的相关技巧,具有一定参考借鉴价值,需要的朋友可以参考下。
本文实例讲述了php图像处理类,分享给大家供大家参考,具体如下:
- <?php
- /**
- * Image 类
- */
- class Image {
- /**
- * @var string $fileName 文件名
- * @access private
- */
- private $fileName = '';
- /**
- * @var gd resource $imageResource 原图像
- * @access private
- */
- private $imageResource = NULL;
- /**
- * @var int $imageWidth 原图像宽
- * @access private
- */
- private $imageWidth = NULL;
- /**
- * @var int $imageHeight 原图像高
- * @access private
- */
- private $imageHeight = NULL;
- /**
- * @var int $imageType 原图像类型
- * @access private
- */
- private $imageType = NULL;
- /**
- * @var int $imageWidth 原图像宽
- * @access private
- */
- public $width = NULL;
- /**
- * @var int $imageHeight 原图像高
- * @access private
- */
- public $height = NULL;
- /**
- * @var int $imageType 原图像类型
- * @access private
- */
- public $type = NULL;
- /**
- * @var int $newResource 新图像
- * @access private
- */
- private $newResource = NULL;
- /**
- * @var int $newResType 新图像类型
- * @access private
- */
- private $newResType = NULL;
- /**
- * 构造函数
- * @param string $fileName 文件名
- */
- public function __construct($fileName = NULL) {
- $this->fileName = $fileName;
- if ($this->fileName) {
- $this->getSrcImageInfo();
- }
- }
- /**
- * 取源图像信息
- * @access private
- * @return void
- */
- private function getSrcImageInfo() {
- $info = $this->getImageInfo();
- $this->imageWidth = $info[0];
- $this->imageHeight = $info[1];
- $this->imageType = $info[2];
- $this->width = $info[0];
- $this->height = $info[1];
- $this->type = $info[2];
- }
- /**
- * 取图像信息
- * @param string $fileName 文件名
- * @access private
- * @return array
- */
- private function getImageInfo($fileName = NULL) {
- if ($fileName==NULL) {
- $fileName = $this->fileName;
- }
- $info = getimagesize($fileName);
- return $info;
- }
- /**
- * 创建源图像GD 资源
- * @access private
- * @return void
- */
- private function createSrcImage () {
- $this->imageResource = $this->createImageFromFile();
- }
- /**
- * 跟据文件创建图像GD 资源
- * @param string $fileName 文件名
- * @return gd resource
- */
- public function createImageFromFile($fileName = NULL)
- {
- if (!$fileName) {
- $fileName = $this->fileName;
- $imgType = $this->imageType;
- }
- if (!is_readable($fileName) || !file_exists($fileName)) {
- throw new Exception('Unable to open file "' . $fileName . '"');
- }
- if (!$imgType) {
- $imageInfo = $this->getImageInfo($fileName);
- $imgType = $imageInfo[2];
- }
- switch ($imgType) {
- case IMAGETYPE_GIF:
- $tempResource = imagecreatefromgif($fileName);
- break;
- case IMAGETYPE_JPEG:
- $tempResource = imagecreatefromjpeg($fileName);
- break;
- case IMAGETYPE_PNG:
- $tempResource = imagecreatefrompng($fileName);
- break;
- case IMAGETYPE_WBMP:
- $tempResource = imagecreatefromwbmp($fileName);
- break;
- case IMAGETYPE_XBM:
- $tempResource = imagecreatefromxbm($fileName);
- break;
- default:
- throw new Exception('Unsupport image type');
- }
- return $tempResource;
- }
- /**
- * 改变图像大小
- * @param int $width 宽
- * @param int $height 高
- * @param string $flag 一般而言,允许截图则用4,不允许截图则用1; 假设要求一个为4:3比例的图像,则:4=如果太长则自动刪除一部分 0=长宽转换成参数指定的 1=按比例缩放,自动判断太长还是太宽,长宽约束在参数指定内 2=以宽为约束缩放 3=以高为约束缩放
- * @param string $bgcolor 如果不为null,则用这个参数指定的颜色作为背景色,并且图像扩充到指定高宽,该参数应该是一个数组;
- * @return string
- */
- public function resizeImage($width, $height, $flag=1, $bgcolor=null) {
- $widthRatio = $width/$this->imageWidth;
- $heightRatio = $height/$this->imageHeight;
- switch ($flag) {
- case 1:
- if ($this->imageHeight < $height && $this->imageWidth < $width) {
- $endWidth = $this->imageWidth;
- $endHeight = $this->imageHeight;
- //return;
- } elseif (($this->imageHeight * $widthRatio)>$height) {
- $endWidth = ceil($this->imageWidth * $heightRatio);
- $endHeight = $height;
- } else {
- $endWidth = $width;
- $endHeight = ceil($this->imageHeight * $widthRatio);
- }
- break;
- case 2:
- $endWidth = $width;
- $endHeight = ceil($this->imageHeight * $widthRatio);
- break;
- case 3:
- $endWidth = ceil($this->imageWidth * $heightRatio);
- $endHeight = $height;
- break;
- case 4:
- $endWidth2 = $width;
- $endHeight2 = $height;
- if ($this->imageHeight < $height && $this->imageWidth < $width) {
- $endWidth = $this->imageWidth;
- $endHeight = $this->imageHeight;
- //return;
- } elseif (($this->imageHeight * $widthRatio)<$height) {
- $endWidth = ceil($this->imageWidth * $heightRatio);
- $endHeight = $height;
- } else {
- $endWidth = $width;
- $endHeight = ceil($this->imageHeight * $widthRatio);
- }
- break;
- default:
- $endWidth = $width;
- $endHeight = $height;
- break;
- }
- if ($this->imageResource==NULL) {
- $this->createSrcImage();
- }
- if($bgcolor){
- $this->newResource = imagecreatetruecolor($width,$height);
- $bg=ImageColorAllocate($this->newResource,$bgcolor[0],$bgcolor[1],$bgcolor[2]);
- ImageFilledRectangle($this->newResource,0,0,$width,$height,$bg);
- $tox=ceil(($width-$endWidth)/2);
- $toy=ceil(($height-$endHeight)/2);
- if($tox<0) $tox=0;
- if($toy<0) $toy=0;
- }else if ($flag==4) {
- $this->newResource = imagecreatetruecolor($endWidth2,$endHeight2);
- }else {
- $this->newResource = imagecreatetruecolor($endWidth,$endHeight);
- }
- $this->newResType = $this->imageType;
- imagecopyresampled($this->newResource, $this->imageResource, $tox, $toy, 0, 0, $endWidth, $endHeight,$this->imageWidth,$this->imageHeight);
- }
- /**
- * 给图像加水印
- * @param string $waterContent 水印内容可以是图像文件名,也可以是文字
- * @param int $pos 位置0-9可以是数组
- * @param int $textFont 字体大字,当水印内容是文字时有效
- * @param string $textColor 文字颜色,当水印内容是文字时有效
- * @return string
- */
- public function waterMark($waterContent, $pos = 0, $textFont=5, $textColor="#ffffff") {
- $isWaterImage = file_exists($waterContent);
- if ($isWaterImage) {
- $waterImgRes = $this->createImageFromFile($waterContent);
- $waterImgInfo = $this->getImageInfo($waterContent);
- $waterWidth = $waterImgInfo[0];
- $waterHeight = $waterImgInfo[1];
- } else {
- $waterText = $waterContent;
- //$temp = @imagettfbbox(ceil($textFont*2.5),0,"./cour.ttf",$waterContent);
- if ($temp) {
- $waterWidth = $temp[2]-$temp[6];
- $waterHeight = $temp[3]-$temp[7];
- } else {
- $waterWidth = 100;
- $waterHeight = 12;
- }
- }
- if ($this->imageResource==NULL) {
- $this->createSrcImage();
- }
- switch($pos)
- {
- case 0://随机
- $posX = rand(0,($this->imageWidth - $waterWidth));
- $posY = rand(0,($this->imageHeight - $waterHeight));
- break;
- case 1://1为顶端居左
- $posX = 0;
- $posY = 0;
- break;
- case 2://2为顶端居中
- $posX = ($this->imageWidth - $waterWidth) / 2;
- $posY = 0;
- break;
- case 3://3为顶端居右
- $posX = $this->imageWidth - $waterWidth;
- $posY = 0;
- break;
- case 4://4为中部居左
- $posX = 0;
- $posY = ($this->imageHeight - $waterHeight) / 2;
- break;
- case 5://5为中部居中
- $posX = ($this->imageWidth - $waterWidth) / 2;
- $posY = ($this->imageHeight - $waterHeight) / 2;
- break;
- case 6://6为中部居右
- $posX = $this->imageWidth - $waterWidth;
- $posY = ($this->imageHeight - $waterHeight) / 2;
- break;
- case 7://7为底端居左
- $posX = 0;
- $posY = $this->imageHeight - $waterHeight;
- break;
- case 8://8为底端居中
- $posX = ($this->imageWidth - $waterWidth) / 2;
- $posY = $this->imageHeight - $waterHeight;
- break;
- case 9://9为底端居右
- $posX = $this->imageWidth - $waterWidth-20;
- $posY = $this->imageHeight - $waterHeight-10;
- break;
- default://随机
- $posX = rand(0,($this->imageWidth - $waterWidth));
- $posY = rand(0,($this->imageHeight - $waterHeight));
- break;
- }
- imagealphablending($this->imageResource, true);
- if($isWaterImage) {
- imagecopy($this->imageResource, $waterImgRes, $posX, $posY, 0, 0, $waterWidth,$waterHeight);
- } else {
- $R = hexdec(substr($textColor,1,2));
- $G = hexdec(substr($textColor,3,2));
- $B = hexdec(substr($textColor,5));
- $textColor = imagecolorallocate($this->imageResource, $R, $G, $B);
- imagestring ($this->imageResource, $textFont, $posX, $posY, $waterText, $textColor);
- }
- $this->newResource = $this->imageResource;
- $this->newResType = $this->imageType;
- }
- /**
- * 生成验证码图片
- * @param int $width 宽
- * @param string $height 高
- * @param int $length 长度
- * @param int $validType 0=数字,1=字母,2=数字加字母
- * @param string $textColor 文字颜色
- * @param string $backgroundColor 背景颜色
- * @return void
- */
- public function imageValidate($width, $height, $length = 4, $validType = 1, $textColor = '#000000', $backgroundColor = '#ffffff') {
- if ($validType==1) {
- $validString = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
- $validLength = 52;
- } elseif ($validType==2) {
- $validString = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
- $validLength = 62;
- } else {
- $validString = '123456789';
- $validLength = 9;
- }
- srand((int)time());
- $valid = '';
- for ($i=0; $i<$length; $i++) {
- $valid .= $validString{rand(0, $validLength-1)};
- }
- $this->newResource = imagecreate($width,$height);
- $bgR = hexdec(substr($backgroundColor,1,2));
- $bgG = hexdec(substr($backgroundColor,3,2));
- $bgB = hexdec(substr($backgroundColor,5,2));
- $backgroundColor = imagecolorallocate($this->newResource, $bgR, $bgG, $bgB);
- $tR = hexdec(substr($textColor,1,2));
- $tG = hexdec(substr($textColor,3,2));
- $tB = hexdec(substr($textColor,5,2));
- $textColor = imagecolorallocate($this->newResource, $tR, $tG, $tB);
- for ($i=0;$i<strlen($valid);$i++){
- imagestring($this->newResource,5,$i*$width/$length+3,2, $valid[$i],$textColor);
- }
- $this->newResType = IMAGETYPE_JPEG;
- return $valid;
- }
- /**
- * 显示输出图像
- * @return void
- */
- public function display($fileName='', $quality=100) {
- $imgType = $this->newResType;
- $imageSrc = $this->newResource;
- switch ($imgType) {
- case IMAGETYPE_GIF:
- if ($fileName=='') {
- header('Content-type: image/gif');
- }
- imagegif($imageSrc, $fileName, $quality);
- break;
- case IMAGETYPE_JPEG:
- if ($fileName=='') {
- header('Content-type: image/jpeg');
- }
- imagejpeg($imageSrc, $fileName, $quality);
- break;
- case IMAGETYPE_PNG:
- if ($fileName=='') {
- header('Content-type: image/png');
- imagepng($imageSrc);
- } else {
- imagepng($imageSrc, $fileName);
- }
- break;
- case IMAGETYPE_WBMP:
- if ($fileName=='') {
- header('Content-type: image/wbmp');
- }
- imagewbmp($imageSrc, $fileName, $quality);
- break;
- case IMAGETYPE_XBM:
- if ($fileName=='') {
- header('Content-type: image/xbm');
- }
- imagexbm($imageSrc, $fileName, $quality);
- break;
- default:
- throw new Exception('Unsupport image type');
- }
- imagedestroy($imageSrc);
- }
- /**
- * 保存图像
- * @param int $fileNameType 文件名类型 0使用原文件名,1使用指定的文件名,2在原文件名加上后缀,3产生随机文件名
- * @param string $folder 文件夹路径 为空为与原文件相同
- * @param string $param 参数$fileNameType为1时为文件名2时为后缀
- * @return void
- */
- public function save($fileNameType = 0, $folder = NULL, $param = '_miniature') {
- if ($folder==NULL) {
- $folder = dirname($this->fileName).DIRECTORY_SEPARATOR;
- }
- $fileExtName = FileSystem::fileExt($this->fileName, true);
- $fileBesicName = FileSystem::getBasicName($this->fileName, false);
- switch ($fileNameType) {
- case 1:
- $newFileName = $folder.$param;
- break;
- case 2:
- $newFileName = $folder.$fileBesicName.$param.$fileExtName;
- break;
- case 3:
- $tmp = date('YmdHis');
- $fileBesicName = $tmp;
- $i = 0;
- while (file_exists($folder.$fileBesicName.$fileExtName)) {
- $fileBesicName = $tmp.$i;
- $i++;
- }
- $newFileName = $folder.$fileBesicName.$fileExtName;
- break;
- default:
- $newFileName = $this->fileName;
- break;
- }
- $this->display($newFileName);
- return $newFileName;
- }
- }
- ?>
希望本文所述对大家的php程序设计有所帮助。
Tags: php图像处理类
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