a.php

<?php

$d=getimagesize('xbdl.jpg');

var_dump($d);

?>

image.class.php

<?php

class Image{

    private $path;

 

    public function __construct($path='./'){

        $this->path=rtrim($path,'/').'/';

    }

 

    public  function water($background,$water,$pos=0,$tm=100,$prefix='water_'){

        $background=$this->path.$background;

        $water=$this->path.$water;

 

        if(file_exists($background)|file_exists($water)){

            $backInfo=self::getImageInfo($background);

            $waterInfo=self::getImageInfo($water);

            if(!self::checkSize($backInfo,$waterInfo)){

                echo '水印图片的大小超过了背景图片的大小';

                return false;   

            }

            $position=self::getPosition($backInfo,$waterInfo,$pos);

            //打开图片资源

            $backRes=self::openImage($background,$backInfo['type']);

            $waterRes=self::openImage($water,$waterInfo['type']);

            $newRes=self::mergeImage($backRes,$waterRes,$position,$waterInfo,$tm);

 

            if($path=self::save($newRes,$backInfo,$prefix,$this->path)){

         

                self::des($waterRes);

                self::des($backRes);

 

                return $path;

            }else{

                echo '保存文件失败';

                return false;

 

            }

 

 

        }else{

            echo '传入的水印图片或者是背景图片未找到';

            return false;

             

        }

         

    }

    static function des($res){

        imagedestroy($res);

    }

    static private function save($res,$info,$prefix,$path){

        $path=$path.$prefix.$info['name'];

        switch($info['type']){

            case 'image/jpeg':

            case 'image/pjpeg':

            case 'image/jpg':

                imagejpeg($res,$path);

                break;

            case 'image/gif':

                imagegif($res,$path);

                break;

            case 'image/png':

            case 'image/x-png':

                imagepng($res,$path);

                break;

            case 'image/wbmp':

                imagewbmp($res,$path);

                break;

            default:

                echo '我不认识这个类型';        

        }

        return $path;

    }

    static private function mergeImage($b,$w,$p,$wI,$tm){

         imagecopymerge($b,$w,$p['x'],$p['y'],0,0,$wI['width'],$wI['height'],$tm);

            return $b;

    }

    static private function openImage($path,$type){

        switch($type){

            case 'image/jpeg':

            case 'image/pjpeg':

            case 'image/jpg':

                $res=imagecreatefromjpeg($path);

                break;

            case 'image/gif':

                $res=imagecreatefromgif($path);

                break;

            case 'image/png':

            case 'image/x-png':

                $res=imagecreatefrompng($path);

                break;

            case 'image/wbmp':

                $res=imagecreatefromwbmp($path);

                break;

            default:

                echo '我不认识这个类型';

                $res=null;

        }

        return $res;

    }

    static private function getPosition($b,$w,$pos){

        switch($pos){

            case 1:

                $x=0;

                $y=0;

                break;

            case 2:

                $x=ceil(($b['width']-$w['width'])/2);

                $y=0;

                break;

            case 3:

                $x=$b['width']-$w['width'];

                $y=0;

                break;

            case 4:

                $x=0;

                $y=ceil(($b['height']-$w['height'])/2);

                break;

            case 5:

                $x=ceil(($b['width']-$w['width'])/2);

                $y=ceil(($b['height']-$w['height'])/2);

                break;

            case 6:

                $x=$b['width']-$w['width'];

                $y=ceil(($b['height']-$w['height'])/2);

                break;

            case 7:

                $x=0;

                $y=$b['height']-$w['height'];

                break;

            case 8:

                $x=ceil(($b['width']-$w['width'])/2);

                $y=$b['height']-$w['height'];

                break;

            case 9:

                $x=$b['width']-$w['width'];

                $y=$b['height']-$w['height'];

                break;

            case 0:

                $x=mt_rand(0,$b['width']-$w['width']);

                $y=mt_rand(0,$b['height']-$w['height']);

                break;

        }

        return array('x'=>$x,'y'=>$y);

    }

    static private function checkSize($backInfo,$waterInfo){

        if($backInfo['width']<=$waterInfo['width']|$backInfo['height']<=$waterInfo['height']){

            return false;

        }else{

            return true;

        }

    }

    private static  function getImageInfo($path){

        $info=getimagesize($path);

        $data['width']=$info[0];

        $data['height']=$info[1];

        $data['type']=$info['mime'];

        $data['name']=basename($path);

        return $data;

    }

}

?>

image.php

<?php

include 'image.class.php';

$a=new Image();

 

 

$a->water('a.jpg','taobao.png',1,100,'wa1_');

$a->water('a.jpg','taobao.png',2,100,'wa2_');

$a->water('a.jpg','taobao.png',3,100,'wa3_');

$a->water('a.jpg','taobao.png',4,100,'wa4_');

$a->water('a.jpg','taobao.png',5,100,'wa5_');

$a->water('a.jpg','taobao.png',6,100,'wa6_');

$a->water('a.jpg','taobao.png',7,100,'wa7_');

$a->water('a.jpg','taobao.png',8,100,'wa8_');

$a->water('a.jpg','taobao.png',9,100,'wa9_');

$a->water('a.jpg','taobao.png',0,100,'wa0_');

?>