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。 在一些需要图片高级处理功能的Web应用中，可以参考这个类。

<?php
/*
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
*/
class picture
{
    var $PICTURE_URL;//要处理的图片
    var $DEST_URL="temp__01.jpg";//生成目标图片位置
    var $PICTURE_CREATE;//要创建的图片
    var $TURE_COLOR;//新建一个真彩图象
 
    var $PICTURE_WIDTH;//原图片宽度
    var $PICTURE_HEIGHT;//原图片高度
 
/*
水印的类型，默认的为水印文字
*/
    var $MARK_TYPE=1;
    var $WORD;//经过UTF-8后的文字
    var $WORD_X;//文字横坐标
    var $WORD_Y;//文字纵坐标
    var $FONT_TYPE;//字体类型
    var $FONT_SIZE="12";//字体大小
    var $FONT_WORD;//文字
    var $ANGLE=0;//文字的角度，默认为0
    var $FONT_COLOR="#000000";//文字颜色
    var $FONT_PATH="font/simkai.ttf";//字体库，默认为宋体
    var $FORCE_URL;//水印图片
    var $FORCE_X=0;//水印横坐标
    var $FORCE_Y=0;//水印纵坐标
    var $FORCE_START_X=0;//切起水印的图片横坐标
    var $FORCE_START_Y=0;//切起水印的图片纵坐标
 
    var $PICTURE_TYPE;//图片类型
    var $PICTURE_MIME;//输出的头部
 
/*
缩放比例为1的话就按缩放高度和宽度缩放
*/
    var $ZOOM=1;//缩放类型
    var $ZOOM_MULTIPLE;//缩放比例
    var $ZOOM_WIDTH;//缩放宽度
    var $ZOOM_HEIGHT;//缩放高度
 
/*
裁切，按比例和固定长度、宽度
*/
    var $CUT_TYPE=1;//裁切类型
    var $CUT_X=0;//裁切的横坐标
    var $CUT_Y=0;//裁切的纵坐标
    var $CUT_;//裁切的宽度
    var $CUT_HEIGHT=100;//裁切的高度
 
/*
锐化
*/
    var $SHARP="7.0";//锐化程度
 
/*
透明度处理
*/
    var $ALPHA='100';//透明度在0-127之间
    var $ALPHA_X="90";
    var $ALPHA_Y="50";
 
/*
任意角度旋转
*/
    var $CIRCUMROTATE="90.0";//注意，必须为浮点数
 
/*
出错信息
*/
    var $ERROR=array(
        'unalviable'=>'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_;
        $this->PICTURE_HEIGHT=$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_;gt;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_;
    $FORCE_PICTURE_HEIGHT=$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_;gt;FORCE_START_X;
    }
    else
    {
        $CREATE_;gt;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
}
?>