PHP制作图片缩略图、加水印、加字体

下面是我提供的一个类，下面封装了这三种功能：

<?php /*** */class ImageHelper{private $imgSrc;private $info;private $type;private $image;private $showOrSaveFunc;public function __construct($imgSrc) {$this->imgSrc = $imgSrc;$this->init();}/*** 初始化操作*/private function init() {//获取图片信息(通过GD库提供的方法，得到你想要处理的图片的基本信息)$this->info = getimagesize($this->imgSrc);//通过图像的编号来获取图像的类型$this->type = image_type_to_extension($this->info[2], false);//在内存中创建一个和我们图像类型一样的图像$fun = "imagecreatefrom{$this->type}";//把图片复制到内存中$this->image = $fun($this->imgSrc);$this->showOrSaveFunc = "image{$this->type}";}/*** 给图片添加字体* @param $fontfile 字体文件路径* @param $text 文字内容* @param $red 红色分量* @param $green 绿色分量* @param $blue 蓝色分量* @param $alpha 透明度* @param $angle 偏移角度* @param $size 字体大小* @param $x 距离左边的距离* @param $y 距离右边的距离*/public function addFont($fontfile, $text, $red, $green, $blue, $alpha, $angle, $size, $x, $y) {$color = imagecolorallocatealpha($this->image, $red, $green, $blue, $alpha);imagettftext($this->image, $size, $angle, $x, $y, $color, $fontfile, $text);}/*** 浏览器输出图片类型*/private function setOutputHeader() {header("Content-Type:".$this->info['mime']);}/*** 输出图片到浏览器*/public function outputImageToBrowser() {$this->setOutputHeader();$this->excShowOrSaveFunc($this->showOrSaveFunc);}/*** 输出或者保存图片*/private function excShowOrSaveFunc($type, $file='') {if ($file == '') {$type($this->image);} else {$type($this->image, $file);}}/*** 保存文件到本地* @param 本地路径* @param 文件名*/public function outputImageToStorage($filepath, $filename) {$this->setOutputHeader();$this->excShowOrSaveFunc($this->showOrSaveFunc, $filepath.$filename.'.'.$this->type);}/*** 为图片添加水印* @param $waterMarkPath 水印图片路径* @param $dst_x 水印距离原图左侧的距离* @param $dst_y 水印距离原图上侧的距离* @param $pct 水印的透明度*/public function addWaterMark($waterMarkPath, $dst_x, $dst_y, $pct) {$waterInfo = getimagesize($waterMarkPath);$waterType = image_type_to_extension($waterInfo[2], false);$waterFun = "imagecreatefrom{$waterType}";$waterMarkImage = $waterFun($waterMarkPath);//imagecopymerge(dst_im, src_im, dst_x, dst_y, src_x, src_y, src_w, src_h, pct)//pct透明度imagecopymerge($this->image, $waterMarkImage, $dst_x, $dst_y, 0, 0, $waterInfo[0], $waterInfo[1], $pct);imagedestroy($waterMarkImage);}/*** 生成图片缩略图* @param $mWidth 想要压缩的宽度*/public function createThumbnail($mWidth) {$width = $this->info[0];$height = $this->info[1];if ($mWidth >= $width) {return ;}$mHeight = $height * $mWidth / $width;//1.在内存中建立一个宽300、高200的真色彩图片$imageThumb = imagecreatetruecolor($mWidth, $mHeight);//2.核心步骤、将原图复制到新建的正色彩图片上，并按照一定比例压缩//imagecopyresampled(dst_image, src_image, dst_x, dst_y, src_x, src_y, dst_w, dst_h, src_w, src_h)imagecopyresampled($imageThumb, $this->image, 0, 0, 0, 0, $mWidth, $mHeight, $width, $height);$this->image = $imageThumb;}/** 销毁图片资源*/public function destroy() {imagedestroy($this->image);}} ?>

使用方法如下：

<?php require_once 'ImageHelper.class.php';$imageHelper = new ImageHelper('P60219-211631.jpg');/*$imageHelper->addFont("consola.ttf", "raid", 0, 0, 0, 50, 0, 45, 20, 20);$imageHelper->addWaterMark('pic2.jpg', 0, 0, 50);*/$imageHelper->createThumbnail(300);// $imageHelper->outputImageToBrowser();$imageHelper->outputImageToStorage('','testImageHelperAddFont');$imageHelper->destroy(); ?>