PHP图片处理类(水印、透明度、旋转)

非常强大的php图片处理类，可以自定义图片水印、透明度、图片缩放、图片锐化、图片旋转、图片翻转、图片剪切、图片反色。

• 图片处理函数功能：缩放、剪切、相框、水印、锐化、旋转、翻转、透明度、反色
• 处理并保存历史记录的思路：当有图片有改动时自动生成一张新图片，命名方式可以考虑在原图片的基础上加上步骤，例如：图片名称+__第几步

具体代码如下：

 '没有找到相关图片!'
    );

    /**
     * 构造函数：函数初始化
     */
    function __construct($PICTURE_URL){

        $this -> get_info($PICTURE_URL);

    }
    function get_info($PICTURE_URL){
        /**
         * 处理原图片的信息,先检测图片是否存在,不存在则给出相应的信息
         */
        @$SIZE = getimagesize($PICTURE_URL);
        if(!$SIZE){
            exit($this -> ERROR['unalviable']);
        }

        // 得到原图片的信息类型、宽度、高度 
        $this -> PICTURE_MIME = $SIZE['mime'];
        $this -> PICTURE_WIDTH = $SIZE[0];
        $this -> PICTURE_HEIGHT = $SIZE[1];

        // 创建图片 
        switch($SIZE[2]){
            case 1:
                $this -> PICTURE_CREATE = imagecreatefromgif($PICTURE_URL);
                $this -> PICTURE_TYPE = "imagejpeg";
                $this -> PICTURE_EXT = "jpg";
                break;
            case 2:
                $this -> PICTURE_CREATE = imagecreatefromjpeg($PICTURE_URL);
                $this -> PICTURE_TYPE = "imagegif";
                $this -> PICTURE_EXT = "gif";
                break;
            case 3:
                $this -> PICTURE_CREATE = imagecreatefrompng($PICTURE_URL);
                $this -> PICTURE_TYPE = "imagepng";
                $this -> PICTURE_EXT = "png";
                break;
        }

        /**
         * 文字颜色转换16进制转换成10进制
         */
        preg_match_all("/([0-f]){2,2}/i", $this -> FONT_COLOR, $MATCHES);
        if(count($MATCHES) == 3){
            $this -> RED = hexdec($MATCHES[0][0]);
            $this -> GREEN = hexdec($MATCHES[0][1]);
            $this -> BLUE = hexdec($MATCHES[0][2]);
        }
    }

    # end of __construct 
    /**
     * 将16进制的颜色转换成10进制的（R，G，B）
     */
    function hex2dec(){
        preg_match_all("/([0-f]){2,2}/i", $this -> FONT_COLOR, $MATCHES);
        if(count($MATCHES) == 3){
            $this -> RED = hexdec($MATCHES[0][0]);
            $this -> GREEN = hexdec($MATCHES[0][1]);
            $this -> BLUE = hexdec($MATCHES[0][2]);
        }
    }

    // 缩放类型 
    function zoom_type($ZOOM_TYPE){
        $this -> ZOOM = $ZOOM_TYPE;
    }

    // 对图片进行缩放,如果不指定高度和宽度就进行缩放 
    function zoom(){
        // 缩放的大小 
        if($this -> ZOOM == 0){
            $this -> ZOOM_WIDTH = $this -> PICTURE_WIDTH * $this -> ZOOM_MULTIPLE;
            $this -> ZOOM_HEIGHT = $this -> PICTURE_HEIGHT * $this -> ZOOM_MULTIPLE;
        }
        // 新建一个真彩图象 
        $this -> TRUE_COLOR = imagecreatetruecolor($this -> ZOOM_WIDTH, $this -> ZOOM_HEIGHT);
        $WHITE = imagecolorallocate($this -> TRUE_COLOR, 255, 255, 255);
        imagefilledrectangle($this -> TRUE_COLOR, 0, 0, $this -> ZOOM_WIDTH, $this -> ZOOM_HEIGHT, $WHITE);
        imagecopyresized($this -> TRUE_COLOR, $this -> PICTURE_CREATE, 0, 0, 0, 0, $this -> ZOOM_WIDTH, $this -> ZOOM_HEIGHT, $this -> PICTURE_WIDTH, $this -> PICTURE_HEIGHT);
    }

    # end of zoom 
// 裁切图片,按坐标或自动 
    function cut(){
        $this -> TRUE_COLOR = imagecreatetruecolor($this -> CUT_WIDTH, $this -> CUT_WIDTH);
        imagecopy($this -> TRUE_COLOR, $this -> PICTURE_CREATE, 0, 0, $this -> CUT_X, $this -> CUT_Y, $this -> CUT_WIDTH, $this -> CUT_HEIGHT);
    }

    # end of cut 
    /**
     * 在图片上放文字或图片
     * 水印文字
     */
    function _mark_text(){
        $this -> TRUE_COLOR = imagecreatetruecolor($this -> PICTURE_WIDTH, $this -> PICTURE_HEIGHT);
        $this -> WORD = mb_convert_encoding($this -> FONT_WORD, 'utf-8', 'gb2312');
        /**
         * 取得使用 TrueType 字体的文本的范围
         */
        $TEMP = imagettfbbox($this -> FONT_SIZE, 0, $this -> FONT_PATH, $this -> WORD);
        $WORD_LENGTH = strlen($this -> WORD);
        $WORD_WIDTH = $TEMP[2] - $TEMP[6];
        $WORD_HEIGHT = $TEMP[3] - $TEMP[7];
        /**
         * 文字水印的默认位置为右下角
         */
        if($this -> WORD_X == ""){
            $this -> WORD_X = $this -> PICTURE_WIDTH - $WORD_WIDTH;
        }
        if($this -> WORD_Y == ""){
            $this -> WORD_Y = $this -> PICTURE_HEIGHT - $WORD_HEIGHT;
        }
        imagesettile($this -> TRUE_COLOR, $this -> PICTURE_CREATE);
        imagefilledrectangle($this -> TRUE_COLOR, 0, 0, $this -> PICTURE_WIDTH, $this -> PICTURE_HEIGHT, IMG_COLOR_TILED);
        $TEXT2 = imagecolorallocate($this -> TRUE_COLOR, $this -> RED, $this -> GREEN, $this -> Blue);
        imagettftext($this -> TRUE_COLOR, $this -> FONT_SIZE, $this -> ANGLE, $this -> WORD_X, $this -> WORD_Y, $TEXT2, $this -> FONT_PATH, $this -> WORD);
    }

    /**
     * 水印图片
     */
    function _mark_picture(){

        /**
         * 获取水印图片的信息
         */
        @$SIZE = getimagesize($this -> FORCE_URL);
        if(!$SIZE){
            exit($this -> ERROR['unalviable']);
        }
        $FORCE_PICTURE_WIDTH = $SIZE[0];
        $FORCE_PICTURE_HEIGHT = $SIZE[1];
        // 创建水印图片 
        switch($SIZE[2]){
            case 1:
                $FORCE_PICTURE_CREATE = imagecreatefromgif($this -> FORCE_URL);
                $FORCE_PICTURE_TYPE = "gif";
                break;
            case 2:
                $FORCE_PICTURE_CREATE = imagecreatefromjpeg($this -> FORCE_URL);
                $FORCE_PICTURE_TYPE = "jpg";
                break;
            case 3:
                $FORCE_PICTURE_CREATE = imagecreatefrompng($this -> FORCE_URL);
                $FORCE_PICTURE_TYPE = "png";
                break;
        }
        /**
         * 判断水印图片的大小，并生成目标图片的大小，如果水印比图片大，则生成图片大小为水印图片的大小。否则生成的图片大小为原图片大小。
         */
        $this -> NEW_PICTURE = $this -> PICTURE_CREATE;
        if($FORCE_PICTURE_WIDTH > $this -> PICTURE_WIDTH){
            $CREATE_WIDTH = $FORCE_PICTURE_WIDTH - $this -> FORCE_START_X;
        }else{
            $CREATE_WIDTH = $this -> PICTURE_WIDTH;
        }
        if($FORCE_PICTURE_HEIGHT > $this -> PICTURE_HEIGHT){
            $CREATE_HEIGHT = $FORCE_PICTURE_HEIGHT - $this -> FORCE_START_Y;
        }else{
            $CREATE_HEIGHT = $this -> PICTURE_HEIGHT;
        }
        /**
         * 创建一个画布
         */
        $NEW_PICTURE_CREATE = imagecreatetruecolor($CREATE_WIDTH, $CREATE_HEIGHT);
        $WHITE = imagecolorallocate($NEW_PICTURE_CREATE, 255, 255, 255);
        /**
         * 将背景图拷贝到画布中
         */
        imagecopy($NEW_PICTURE_CREATE, $this -> PICTURE_CREATE, 0, 0, 0, 0, $this -> PICTURE_WIDTH, $this -> PICTURE_HEIGHT);

        /**
         * 将目标图片拷贝到背景图片上
         */
        imagecopy($NEW_PICTURE_CREATE, $FORCE_PICTURE_CREATE, $this -> FORCE_X, $this -> FORCE_Y, $this -> FORCE_START_X, $this -> FORCE_START_Y, $FORCE_PICTURE_WIDTH, $FORCE_PICTURE_HEIGHT);
        $this -> TRUE_COLOR = $NEW_PICTURE_CREATE;
    }
    # end of mark 
    function alpha_(){
        $this -> TRUE_COLOR = imagecreatetruecolor($this -> PICTURE_WIDTH, $this -> PICTURE_HEIGHT);
        $rgb = "#CDCDCD";
        $tran_color = "#000000";
        for($j = 0;$j <= $this -> PICTURE_HEIGHT-1;$j++){
            for ($i = 0;$i <= $this -> PICTURE_WIDTH-1;$i++)
            {
                $rgb = imagecolorat($this -> PICTURE_CREATE, $i, $j);
                $r = ($rgb >> 16) & 0xFF;
                $g = ($rgb >> 8) & 0xFF;
                $b = $rgb & 0xFF;
                $now_color = imagecolorallocate($this -> PICTURE_CREATE, $r, $g, $b);
                if ($now_color == $tran_color)
                {
                    continue;
                }
                else
                {
                    $color = imagecolorallocatealpha($this -> PICTURE_CREATE, $r, $g, $b, $ALPHA);
                    imagesetpixel($this -> PICTURE_CREATE, $ALPHA_X + $i, $ALPHA_Y + $j, $color);
                }
                $this -> TRUE_COLOR = $this -> PICTURE_CREATE;

            }
        }
    }

    /**
     * 图片旋转:
     * 沿y轴旋转
     */
    function turn_y(){
        $this -> TRUE_COLOR = imagecreatetruecolor($this -> PICTURE_WIDTH, $this -> PICTURE_HEIGHT);
        for ($x = 0; $x < $this -> PICTURE_WIDTH; $x++)
        {
            imagecopy($this -> TRUE_COLOR, $this -> PICTURE_CREATE, $this -> PICTURE_WIDTH - $x - 1, 0, $x, 0, 1, $this -> PICTURE_HEIGHT);
        }
    }
    /**
     * 沿X轴旋转
     */
    function turn_x(){
        $this -> TRUE_COLOR = imagecreatetruecolor($this -> PICTURE_WIDTH, $this -> PICTURE_HEIGHT);
        for ($y = 0; $y < $this -> PICTURE_HEIGHT; $y++){
            imagecopy($this -> TRUE_COLOR, $this -> PICTURE_CREATE, 0, $this -> PICTURE_HEIGHT - $y - 1, 0, $y, $this -> PICTURE_WIDTH, 1);
        }
    }

    /**
     * 任意角度旋转
     */
    function turn(){
        $this -> TRUE_COLOR = imagecreatetruecolor($this -> PICTURE_WIDTH, $this -> PICTURE_HEIGHT);
        imageCopyResized($this -> TRUE_COLOR, $this -> PICTURE_CREATE, 0, 0, 0, 0, $this -> PICTURE_WIDTH, $this -> PICTURE_HEIGHT, $this -> PICTURE_WIDTH, $this -> PICTURE_HEIGHT);
        $WHITE = imagecolorallocate($this -> TRUE_COLOR, 255, 255, 255);
        $this -> TRUE_COLOR = imagerotate ($this -> TRUE_COLOR, $this -> CIRCUMROTATE, $WHITE);
    }
    /**
     * 图片锐化
     */
    function sharp(){
        $this -> TRUE_COLOR = imagecreatetruecolor($this -> PICTURE_WIDTH, $this -> PICTURE_HEIGHT);
        $cnt = 0;
        for ($x = 0; $x < $this -> PICTURE_WIDTH; $x++){
            for ($y = 0; $y < $this -> PICTURE_HEIGHT; $y++){
                $src_clr1 = imagecolorsforindex($this -> TRUE_COLOR, imagecolorat($this -> PICTURE_CREATE, $x-1, $y-1));
                $src_clr2 = imagecolorsforindex($this -> TRUE_COLOR, imagecolorat($this -> PICTURE_CREATE, $x, $y));
                $r = intval($src_clr2["red"] + $this -> SHARP * ($src_clr2["red"] - $src_clr1["red"]));
                $g = intval($src_clr2["green"] + $this -> SHARP * ($src_clr2["green"] - $src_clr1["green"]));
                $b = intval($src_clr2["blue"] + $this -> SHARP * ($src_clr2["blue"] - $src_clr1["blue"]));
                $r = min(255, max($r, 0));
                $g = min(255, max($g, 0));
                $b = min(255, max($b, 0));
                if (($DST_CLR = imagecolorexact($this -> PICTURE_CREATE, $r, $g, $b)) == -1)
                    $DST_CLR = imagecolorallocate($this -> PICTURE_CREATE, $r, $g, $b);
                $cnt++;
                if ($DST_CLR == -1) die("color allocate faile at $x, $y ($cnt).");
                imagesetpixel($this -> TRUE_COLOR, $x, $y, $DST_CLR);
            }
        }
    }
    /**
     * 将图片反色处理??
     */
    function return_color(){
        /**
         * 创建一个画布
         */
        $NEW_PICTURE_CREATE = imagecreate($this -> PICTURE_WIDTH, $this -> PICTURE_HEIGHT);
        $WHITE = imagecolorallocate($NEW_PICTURE_CREATE, 255, 255, 255);
        /**
         * 将背景图拷贝到画布中
         */
        imagecopy($NEW_PICTURE_CREATE, $this -> PICTURE_CREATE, 0, 0, 0, 0, $this -> PICTURE_WIDTH, $this -> PICTURE_HEIGHT);
        $this -> TRUE_COLOR = $NEW_PICTURE_CREATE;
    }

    /**
     * 生成目标图片并显示
     */
    function show(){
        // 判断浏览器,若是IE就不发送头 
        if(isset($_SERVER['HTTP_USER_AGENT']))
        {
            $ua = strtoupper($_SERVER['HTTP_USER_AGENT']);
            if(!preg_match('/^.*MSIE.*\)$/i', $ua))
            {
                header("Content-type:$this->PICTURE_MIME");
            }
        }
        $OUT = $this -> PICTURE_TYPE;
        $OUT($this -> TRUE_COLOR);
    }

    /**
     * 生成目标图片并保存
     */
    function save_picture(){
        // 以 JPEG 格式将图像输出到浏览器或文件 
        $OUT = $this -> PICTURE_TYPE;
        if(function_exists($OUT)){
            // 判断浏览器,若是IE就不发送头 
            if(isset($_SERVER['HTTP_USER_AGENT']))
            {
                $ua = strtoupper($_SERVER['HTTP_USER_AGENT']);
                if(!preg_match('/^.*MSIE.*\)$/i', $ua))
                {
                    header("Content-type:$this->PICTURE_MIME");
                }
            }
            if(!$this -> TRUE_COLOR){
                exit($this -> ERROR['unavilable']);
            }else{
                $OUT($this -> TRUE_COLOR, $this -> DEST_URL);
                $OUT($this -> TRUE_COLOR);
            }
        }
    }
    /**
     * 析构函数：释放图片
     */
    function __destruct(){
        /**
         * 释放图片
         */
        imagedestroy($this -> TRUE_COLOR);
        imagedestroy($this -> PICTURE_CREATE);
    }
    # end of class 
}
?> 

来源：https://www.jb51.net/article/73711.htm