图片相关操作类

class ImageTool{private $imagePath;//图片路径private $outputDir;//输出文件夹public $memoryImg;//内存图像public $path;public function __construct($imagePath, $outputDir = null){$this->imagePath = $imagePath;$this->outputDir = $outputDir;$this->memoryImg = null;$this->path = null;}/*** 显示内存中的图片* @param $image*/public function showImage(){if ($this->memoryImg != null) {$info = getimagesize($this->imagePath);$type = image_type_to_extension($info[2], false);header('Content-type:' . $info['mime']);$funs = "image{$type}";$funs($this->memoryImg);imagedestroy($this->memoryImg);$this->memoryImg = null;}}/*** 保存图片* @param $image 图片路径* @return string*/private function saveImage($image){$info = getimagesize($this->imagePath);$type = image_type_to_extension($info[2], false);$funs = "image{$type}";if (empty($this->outputDir)) {$funs($image, md5($this->imagePath) . '.' . $type);return md5($this->imagePath) . '.' . $type;} else {$funs($image, $this->outputDir . md5($this->imagePath) . '.' . $type);return $this->outputDir . md5($this->imagePath) . '.' . $type;}}/*** 压缩图片* @param $width 压缩后宽度* @param $height 压缩后高度* @param bool $output 是否输出文件* @return resource*/public function compressImage($width, $height, $output = false){$image = null;$info = getimagesize($this->imagePath);$type = image_type_to_extension($info[2], false);$fun = "imagecreatefrom{$type}";$image = $fun($this->imagePath);imagesavealpha($image,true);//$thumbnail = imagecreatetruecolor($width, $height);imagealphablending($thumbnail,false);//这里很重要,意思是不合并颜色,直接用$img图像颜色替换,包括透明色;imagesavealpha($thumbnail,true);//imagecopyresampled($thumbnail, $image, 0, 0, 0, 0, $width, $height, $info[0], $info[1]);imagedestroy($image);if ($output) {$path = $this->saveImage($thumbnail);$this->path = $path;}$this->memoryImg = $thumbnail;return $this;}/*** 为图像添加文字标记** @param $content 文本内容* @param $size 字体大小* @param $font 字体样式* @param bool $output 是否输出文件* @return $this*/public function addTextmark($content, $size, $font, $output = false){$info = getimagesize($this->imagePath);$type = image_type_to_extension($info[2], false);$fun = "imagecreatefrom{$type}";$image = $fun($this->imagePath);$color = imagecolorallocatealpha($image, 0, 0, 0, 80);$posX = imagesx($image) - strlen($content) * $size / 2;$posY = imagesy($image) - $size / 1.5;imagettftext($image, $size, 0, $posX, $posY, $color, $font, $content);if ($output) {$this->saveImage($image);}$this->memoryImg = $image;return $this;}/*** 为图片添加水印** @param $watermark 水印图片路径* @param $alpha 水印透明度(0-100)* @param bool $output 是否输出文件* @return $this*/public function addWatermark($watermark, $alpha, $output = false){$image_info = getimagesize($this->imagePath);$image_type = image_type_to_extension($image_info[2], false);$image_fun = "imagecreatefrom{$image_type}";$image = $image_fun($this->imagePath);$mark_info = getimagesize($watermark);$mark_type = image_type_to_extension($mark_info[2], false);$mark_fun = "imagecreatefrom{$mark_type}";$mark = $mark_fun($watermark);$posX = imagesx($image) - imagesx($mark);$posY = imagesy($image) - imagesy($mark);imagesavealpha($mark, true);imagecopymerge($image, $mark, $posX, $posY, 0, 0, $mark_info[0], $mark_info[1], $alpha);imagesavealpha($mark, true);if ($output) {$path = $this->saveImage($image);$this->path = $path;}$this->memoryImg = $image;return $this;}//用给定角度旋转图像，以jpeg图像格式为例/*** 水印图片旋转* @param $degrees旋转角度* @param bool $output是否保存图片* @return $this*/function rotateImage($degrees, $output = false){$info = getimagesize($this->imagePath);$type = image_type_to_extension($info[2], false);$fun = "imagecreatefrom{$type}";$image = $fun($this->imagePath);$block = imagecreatetruecolor(170,170);//建立一个画板$bg = imagecolorallocatealpha($block , 0 , 0 , 0 , 127);//拾取一个完全透明的颜色$image = imagerotate($image, $degrees, $bg ,0);imagesavealpha($image, true);header("Content-type: image/{$type}");//旋转后的图片保存if ($output) {$path = $this->saveImage($image);$this->path = $path;}$this->memoryImg = $image;return $this;}/*** 添加PNG透明图片* $bigImgPath 目标图片路径* $smallImgPath 水印图片路径* $width 相对于目标图的x轴放置位置 左上角为 0* $height 相对于目标图的y轴放置位置 左上角为0* $bigImgPaths 合成后的图片路径 若路径名与第一张或第二张路径相同 直接覆盖原图*/public function mergerImg($bigImgPath, $smallImgPath, $width, $height, $bigImgPaths){$image_kuang = imagecreatefromstring(file_get_contents($smallImgPath));$image_photo = imagecreatefromstring(file_get_contents($bigImgPath));//创建一个新的，和大图一样大的画布$image_3 = imageCreatetruecolor(imagesx($image_photo), imagesy($image_photo));//为真彩色画布创建白色背景，再设置为透明$color = imagecolorallocate($image_3, 255, 255, 255);imagefill($image_3, 0, 0, $color);imageColorTransparent($image_3, $color);/*** 先copy图片，再copy画框，实现png的透明效果，将图片嵌入到画框里* imagecopymerge与imagecopy的不同：* imagecopymerge 函数可以支持两个图像叠加时，设置叠加层的透明度。imagecopymerge比imagecopy多一个参数，来设置透明度* PHP内部源码里，imagecopymerge在透明度参数为100时，直接调用imagecopy函数。* imagecopy 函数则不支持叠加透明，但拷贝时可以保留png图像的原透明信息，而imagecopymerge却不支持图片的本身的透明拷贝* 即：使用imagecopymerge函数，可以实现打上透明度为30%的淡淡的水印图标，但图片本身的png就会变得像IE6不支持png透明那样，背景不透明了。* 如果使用imagecopy函数，可以保留图片本身的透明信息，但无法实现30%的淡淡水印叠加，*/imagecopyresampled($image_3,$image_photo,0,0,0,0,imagesx($image_photo),imagesy($image_photo),imagesx($image_photo),imagesy($image_photo));imagecopy($image_3,$image_kuang, $width,$height,0,0,imagesx($image_kuang),imagesy($image_kuang));//存储图片路径imagejpeg($image_3, $bigImgPaths);return $bigImgPaths;}}

控制器调用方法

public function test(){$bigImgPath = 'ren.jpg';//原图路径$waterImgPath = 'tae.png';//水印图路径$imageTool = new ImageTool($waterImgPath, 'tmp/');//图片路径、输出文件夹$smallImgPath = $imageTool->rotateImage(45, true)->path;//旋转$width = 0;//水印所在X坐标$height = 0;//水印所在Y坐标$bigImgPaths = 'new.png';//生成原图加水印新图路径$path = $this->mergerImg($bigImgPath, $smallImgPath, $width, $height, $bigImgPaths);return view('image', compact('path'));}

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