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php 图片操作类,支持生成缩略图,添加水印,上传缩略图

时间:2016-06-22 18:30:42      阅读:190      评论:0      收藏:0      [点我收藏+]

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<?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 $namestrpos $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 );
        }
    }
}

php 图片操作类,支持生成缩略图,添加水印,上传缩略图

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原文地址:http://www.cnblogs.com/yulamp/p/5607089.html

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