php 图片操作类,支持生成缩略图,添加水印,上传缩略图
<?php
class Image { //类开始 public $originimage = ""; //源图片文件地址 public $imageext = ""; //源图片格式 public $thumbimage = ""; //缩略图文件存放地址 public $thumb_maxwidth = 1440; //缩略图最大宽度 public $thumb_maxheight = 900; //缩略图最大高度 public $watermark_text = ""; //水印文字内容 public $watermark_minwidth = 300; //源图片最小宽度：大于此值时加水印 public $watermark_minheight = 200; //源图片最小高度：大于此值时加水印 public $watermark_fontfile = ""; //字体文件 public $watermark_fontsize = 14; //字体大小 public $watermark_logo = "config/water.png"; //水印LOGO地址 public $watermark_transparent = 20; //水印LOGO不透明度 private $origin_width = 0; //源图片宽度 private $origin_height = 0; //源图片高度 private $imageQuilty = 90; //图片质量 private $tmp_originimage = ""; //临时图片(源图片) private $tmp_thumbimage = ""; //临时图片(缩略图) private $tmp_waterimage = ""; //临时图片(水印LOGO) private $_waterPosition = 2; //1正中间 2右下角 //生成缩略图 public function gen_thumbimage() { if ($this->originimage == "" || $this->thumbimage == "") { return 0; } $this->get_oriwidthheight (); if ($this->origin_width < $this->thumb_maxwidth && $this->origin_height < $this->thumb_maxheight) { $this->thumb_maxwidth = $this->origin_width; $this->thumb_maxheight = $this->origin_height; } else { if ($this->origin_width < $this->origin_height) { $this->thumb_maxwidth = ($this->thumb_maxheight / $this->origin_height) * $this->origin_width; } else { $this->thumb_maxheight = ($this->thumb_maxwidth / $this->origin_width) * $this->origin_height; } } $this->get_imagetype (); $this->gen_tmpimage_origin (); $this->gen_tmpimage_thumb (); if ($this->tmp_originimage == "" || $this->tmp_thumbimage == "") { return - 1; } imagecopyresampled ( $this->tmp_thumbimage, $this->tmp_originimage, 0, 0, 0, 0, $this->thumb_maxwidth,$this->thumb_maxheight, $this->origin_width, $this->origin_height ); switch ($this->imageext) { case "gif" : imagegif ( $this->tmp_thumbimage, $this->thumbimage ); return 1; break; case "jpg" : imagejpeg ( $this->tmp_thumbimage, $this->thumbimage, $this->imageQuilty ); return 2; break; case "png" : imagepng ( $this->tmp_thumbimage, $this->thumbimage ); return 3; break; default : return - 2; break; } } //添加文字水印 public function add_watermark1() { if ($this->originimage == "" || $this->watermark_text == "" || $this->watermark_fontfile == "") { return 0; } $this->get_oriwidthheight (); if ($this->origin_width < $this->watermark_minwidth || $this->origin_height < $this->watermark_minheight) { return 0; } $this->get_imagetype (); $this->gen_tmpimage_origin (); if ($this->tmp_originimage == "") { return - 1; } $textcolor = imagecolorallocate ( $this->tmp_originimage, 255, 0, 0 ); $angle = 0; $px = $this->origin_width / 2 - 200; $py = $this->origin_height / 2 - 10; imagettftext ( $this->tmp_originimage, $this->watermark_fontsize, $angle, $px, $py, $textcolor, $this->watermark_fontfile, $this->watermark_text ); switch ($this->imageext) { case "gif" : imagegif ( $this->tmp_originimage, $this->originimage ); return 1; break; case "jpg" : imagejpeg ( $this->tmp_originimage, $this->originimage, $this->imageQuilty ); return 2; break; case "png" : imagepng ( $this->tmp_originimage, $this->originimage ); return 3; break; default : return - 2; break; } } //添加LOGO水印 public function add_watermark2() { if ($this->originimage == "" || $this->watermark_logo == "") { return 0; } $this->get_oriwidthheight (); if ($this->origin_width < $this->watermark_minwidth || $this->origin_height < $this->watermark_minheight) { return 0; } $this->get_imagetype (); $this->gen_tmpimage_origin (); $this->gen_tmpimage_waterlogo (); if ($this->tmp_originimage == "" || $this->tmp_waterimage == "") { return - 1; } list ( $logo_width, $logo_height ) = getimagesize ( $this->watermark_logo ); //正中间 $waterZb = $this->waterPosition ( $logo_width, $logo_height ); $px = $waterZb ['x']; $py = $waterZb ['y']; imagecopymerge ( $this->tmp_originimage, $this->tmp_waterimage, $px, $py, 0, 0, $logo_width,$logo_height, $this->watermark_transparent ); switch ($this->imageext) { case "gif" : imagegif ( $this->tmp_originimage, $this->originimage ); return 1; break; case "jpg" : imagejpeg ( $this->tmp_originimage, $this->originimage, $this->imageQuilty ); return 2; break; case "png" : imagepng ( $this->tmp_originimage, $this->originimage ); return 3; break; default : return - 2; break; } } /** * 上传缩略图 * 注意上传文件大小限制 *@param String $files $_FILES['upload'] 类型 *@param String $path 存储的目录 默认在/static/attached/ *@param boolean $isWater 是否添加水印 * @return string $filePath 网页url图片路径 */ public function upload($files, $path, $isWater) { if (is_uploaded_file ( $files ['tmp_name'] )) { $upfile = $files; $name = $upfile [name]; $type = $upfile [type]; $size = $upfile [size]; $tmp_name = $upfile [tmp_name]; $error = $upfile [error]; if ($size > 1048576) { return array ('status' => false, 'message' => "$name图片太大超过1MB" ); } $rs = $this->getImageSize ( $tmp_name ); if (! $rs ['status']) { $rs ['message'] = $name . $rs ['message']; return $rs; } // 创建文件夹 $save_path = getcwd () . "/static/attached/" . $path . "/"; $save_url = "./static/attached/" . $path . "/"; $ym = date ( "Ym" ); $save_path .= $ym . "/"; $save_url .= $ym . "/"; if (! file_exists ( $save_path )) { mkdir ( $save_path ); } if ($error == '0') { $fileType = substr ( $name, strpos ( $name, "." ) + 1 ); $prefix = $this->getRandPrefix (); $newName = date ( "YmdHi" ) . $prefix . "." . $fileType; $filepath = $save_path . $newName; move_uploaded_file ( $tmp_name, $filepath ); } if ($isWater) { $this->water ( $filepath ); } return array ('status' => true, 'message' => $save_url . $newName ); } } /** * 图片增加水印处理 * @param unknown_type $image */ public function water($image) { $this->watermark_logo = ROOT . $this->watermark_logo; $this->originimage = $image; //LOGO水印 $this->add_watermark2 (); } /** * * 获取随机前缀 */ private function getRandPrefix() { $string = "abcdefghijklmnopqrstuvwxyz0123456789"; $prefix = ''; for($i = 0; $i < 4; $i ++) { $rand = rand ( 0, 33 ); $prefix .= $string {$rand}; } return $prefix; } //检测图片大小 private function getImageSize($image) { list ( $width, $height, $type, $attr ) = getimagesize ( $image ); if ($type != 2 && $type != 3) { return array ('status' => false, 'message' => "图片格式不正确,请上传JPG或者PNG图片" . $type ); } //检测图片大小 if ($width > 1440) { return array ('status' => false, 'message' => "图片宽度请小于1440px,当前为" . $width . "px" ); } if ($height > 900) { return array ('status' => false, 'message' => "图片高度请小于900px,当前为" . $height . "px" ); } return array ('status' => true ); } /** * 生成缩略图 * * @param String $imagefile 原始文件 * @param String $thumbWidth 缩略图宽度 * @param String $thumbHeight 缩略图高度 * @return String 缩略图url */ public function reduceImage($imagefile, $thumbWidth, $thumbHeight, $path = "thumb") { // 生成缩略图 $dir = date ( "Ym", time () ); $imagefile = ROOT . $imagefile; $imagefile_s = ROOT . "static/attached/" . $path . "/" . $dir . "/s_" . basename ( $imagefile ); $imagetrans = new Image (); $imagetrans->originimage = $imagefile; $imagetrans->thumbimage = $imagefile_s; $imagetrans->thumb_maxwidth = $thumbWidth; $imagetrans->thumb_maxheight = $thumbHeight; $isokid = $imagetrans->gen_thumbimage (); return "./static/attached/" . $path . "/" . $dir . "/s_" . basename ( $imagefile ); } /** * 水印位置 * @param int $logo_width * @param int $logo_height * @return 水印坐标 */ private function waterPosition($logo_width, $logo_height) { switch ($this->_waterPosition) { case 1 : $px = $this->origin_width / 2 - $logo_width / 2; $py = $this->origin_height / 2 - $logo_height / 2; break; case 2 : $px = $this->origin_width - $logo_width - 10; $py = $this->origin_height - $logo_height - 10; break; default : $px = $this->origin_width / 2 - $logo_width / 2; $py = $this->origin_height / 2 - $logo_height / 2; break; } return array ('x' => $px, 'y' => $py ); } //获取图片尺寸 private function get_oriwidthheight() { list ( $this->origin_width, $this->origin_height ) = getimagesize ( $this->originimage ); return 1; } /* * 检测图片格式 * 原方法需要开启exif 扩展 */ private function get_imagetype() { $ext = $this->getImgext ( $this->originimage ); switch ($ext) { case 1 : $this->imageext = "gif"; break; case 2 : $this->imageext = "jpg"; break; case 3 : $this->imageext = "png"; break; default : $this->imageext = "unknown"; break; } } //创建临时图片(源图片) private function gen_tmpimage_origin() { $ext = $this->getImgext ( $this->originimage ); switch ($ext) { case 1 : $this->tmp_originimage = imagecreatefromgif ( $this->originimage ); $bgcolor = imagecolorallocate ( $this->tmp_originimage, 0, 0, 0 ); $bgcolortrans = imagecolortransparent ( $this->tmp_originimage, $bgcolor ); break; case 2 : $this->tmp_originimage = imagecreatefromjpeg ( $this->originimage ); break; case 3 : $this->tmp_originimage = imagecreatefrompng ( $this->originimage ); imagesavealpha ( $this->tmp_originimage, true ); break; default : $this->tmp_originimage = ""; break; } } //创建临时图片(缩略图) private function gen_tmpimage_thumb() { $ext = $this->getImgext ( $this->originimage ); switch ($ext) { case 1 : $this->tmp_thumbimage = imagecreatetruecolor ( $this->thumb_maxwidth, $this->thumb_maxheight ); $bgcolor = imagecolorallocate ( $this->tmp_thumbimage, 255, 255, 255 ); imagefill ( $this->tmp_thumbimage, 0, 0, $bgcolor ); break; case 2 : $this->tmp_thumbimage = imagecreatetruecolor ( $this->thumb_maxwidth, $this->thumb_maxheight ); break; case 3 : $this->tmp_thumbimage = imagecreatetruecolor ( $this->thumb_maxwidth, $this->thumb_maxheight ); $bgcolor = imagecolorallocate ( $this->tmp_thumbimage, 255, 255, 255 ); imagefill ( $this->tmp_thumbimage, 0, 0, $bgcolor ); imagealphablending ( $this->tmp_thumbimage, false ); imagesavealpha ( $this->tmp_thumbimage, true ); break; default : $this->tmp_thumbimage = ""; break; } } //创建临时图片(LOGO水印) private function gen_tmpimage_waterlogo() { $ext = $this->getImgext ( $this->watermark_logo ); switch ($ext) { case 1 : $this->tmp_waterimage = imagecreatefromgif ( $this->watermark_logo ); $bgcolor = imagecolorallocate ( $this->tmp_waterimage, 0, 0, 0 ); $bgcolortrans = imagecolortransparent ( $this->tmp_waterimage, $bgcolor ); break; case 2 : $this->tmp_waterimage = imagecreatefromjpeg ( $this->watermark_logo ); break; case 3 : $this->tmp_waterimage = imagecreatefrompng ( $this->watermark_logo ); imagesavealpha ( $this->tmp_waterimage, true ); break; default : $this->tmp_waterimage = ""; break; } } /* * 获取后缀名 */ public function getImgext($filename) { return exif_imagetype ( $filename ); } //释放资源 public function __destruct() { if (is_object ( $this->tmp_originimage ) == true) { imagedestroy ( $this->tmp_originimage ); } if (is_object ( $this->tmp_thumbimage ) == true) { imagedestroy ( $this->tmp_thumbimage ); } if (is_object ( $this->tmp_waterimage ) == true) { imagedestroy ( $this->tmp_waterimage ); } }}
