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    533      //宽  7     [1] => 300      //高  8     [2] => 2        //图片类型 jpg  9     [3] => width="533" height="300" 10     [bits] => 8 11     [channels] => 3 12     [mime] => image/jpeg 13 ) 14  *  15  *  16 $arr = getimagesize('./sanyecao.jpg'); 17 echo image_type_to_mime_type($arr[2]),'类型
'; 18 print_r($arr); 19 */ 20 //先获得图片的信息 21 //水印，把制定图片复制到目标上，并加上透明效果 22 //缩略图:把大尺寸图片复制到小尺寸图片上 23 class ImageTool{ 24     //image info 分析图片的信息，返回信息数组 25     public static function imageInfo($image){ 26         //判断文件是否存在 27         if(!file_exists($image)){ 28             return false; 29         } 30         $info = getimagesize($image); 31         if($info == false){ 32             return false; 33         } 34         $img['width'] = $info['0']; 35         $img['height'] = $info['1']; 36         $img['ext'] = substr($info['mime'],strpos($info['mime'],'/')+1); 37         //print_r($img); 38         return $img; 39     } 40     //加水印 41     //string $dst   带操作图片 42     //$wter         水印图片 43     //$savepath     保存路径  不填则默认替换原始图 44     //$alpha        水印透明度 45     //$pos          水印位置 0：左上角 1：右上角 2：左下角 3：右下角 46     public static function water($dst,$water,$save=NULL,$pos=2,$alpha=50){ 47         if(!file_exists($dst) || !file_exists($water)){ 48             echo '文件不存在'; 49             return false; 50         } 51         //保证水印不能比带操作图片大 52         $dinfo = self::ImageInfo($dst);     //原始图片信息 53         $winfo = self::ImageInfo($water);   //水印图片信息 54          55         //水印图片不能大于操作图片 56         if($winfo['height']>$dinfo['height'] || $winfo['width']>$dinfo['width']){ 57             return false; 58         } 59         //加水印，把两张图都读到画布上  根据类型创建画布 动态加载函数 60         $dfunc = 'imagecreatefrom'.$dinfo['ext']; 61         $wfunc = 'imagecreatefrom'.$winfo['ext']; 62         if(!function_exists($dfunc) || !function_exists($wfunc)){ 63             return false; 64         } 65         //动态加载函数来创建画布 66         $dim = $dfunc($dst);        //创建带操作画布 67         $wim = $wfunc($water);      //创建水印画布 68         //根据水印位置计算粘贴坐标 69         switch($pos){ 70         case 0:             //左上角 71             $posx = 0;   72             $posy = 0; 73             break;   74         case 1:             //右上角 75             $posx = $dinfo['width']-$winfo['width']; 76             $posy = 0; 77             break; 78         case 3:             //左下角 79             $posx = $dinfo['width']-$winfo['width']; 80             $posy = $dinfo['height']-$winfo['height']; 81             break; 82         case 2: 83         default:            //默认右下角 84             $posx = 0; 85             $posy = $dinfo['height']-$winfo['height']; 86             break; 87         } 88         //正式加水印 89         imagecopymerge($dim,$wim,$posx ,$posy ,0 ,0 ,$winfo['width'],$winfo['height'],$alpha); 90         //保存图片 91         if(!$save){ 92             $save = $dst; 93             unlink($dst);       //删除原图 94         } 95         $createfunc = 'image'.$dinfo['ext']; 96         $createfunc($dim,$save); 97         imagedestroy($dim); 98         imagedestroy($wim); 99         return true;100     }101     //生成缩略图102     //103     //104     public static function thumb($dst,$save=NULL,$widht=200,$height=200)105     {106         $dinfo = self::ImageInfo($dst);107         //var_dump(self::ImageInfo($dst));108         //var_dump($dinfo);109         //判断待处理图片是否存在110         if($dinfo == false){111             return false;112         }113         //处理缩放114         //计算缩放比例115         //116         $calc = min($widht/$dinfo['width'],$height/$dinfo['height']);117         118         //创建画布119         $dfunc = 'imagecreatefrom'.$dinfo['ext'];120         //echo $dfunc;121         //动态加载函数来创建画布122         $dim = $dfunc($dst);        //创建带操作画布123         //创建缩略画布124         $tim = imagecreatetruecolor($widht,$height);125         $white = imagecolorallocate($tim,255,255,255);126         //填充缩略画布127         imagefill($tim,0,0,$white);128         $dwidht = $dinfo['width']*$calc;129         $dheight = $dinfo['height']*$calc;130     131         //留白计算132         $paddingx = (int)($widht - $dwidht)/2; 133         $paddingy = (int)($height - $dheight)/2; 134         //复制并缩略135         imagecopyresampled($tim,$dim,$paddingx,$paddingy,0,0,$dwidht,$dheight,$dinfo['width'],$dinfo['height']);136         //保存图片137         if(!$save){138             $save = $dst;139             unlink($dst);140         }141         $createfunc = 'image'.$dinfo['ext'];142         $createfunc($tim,$save);143         imagedestroy($dim);144         imagedestroy($tim);145         return true;146     }147     //生成验证码148     public static function captcha($width=55,$height=28){149         //造化布150         $image = imagecreatetruecolor($width,$height);151         $d_image = imagecreatetruecolor($width,$height);152         //造背景色153         $gray = imagecolorallocate($image,200,200,200);154         $d_gray = imagecolorallocate($d_image,200,200,200);155         //填充背景色156         imagefill($image,0,0,$gray);157         imagefill($d_image,0,0,$d_gray);158         //造随机字体颜色159         $color = imagecolorallocate($image,mt_rand(0,125),mt_rand(0,125),mt_rand(0,125));160         //造随机线条颜色161         $color1 = imagecolorallocate($image,mt_rand(100,125),mt_rand(100,125),mt_rand(0,125));162         $color2 = imagecolorallocate($image,mt_rand(100,125),mt_rand(100,125),mt_rand(0,125));163         $color3 = imagecolorallocate($image,mt_rand(100,125),mt_rand(100,125),mt_rand(0,125));164         //在画布上画线165         imageline($image,mt_rand(0,50),mt_rand(0,25),mt_rand(0,50),mt_rand(0,25),$color1);166         imageline($image,mt_rand(0,50),mt_rand(0,25),mt_rand(0,50),mt_rand(0,25),$color2);167         imageline($image,mt_rand(0,50),mt_rand(0,25),mt_rand(0,50),mt_rand(0,25),$color3);168     169         //在画布上写字170         $text = substr(str_shuffle('abcdefghijkmnpqrstuvwxyzABCDEFGHIJKMNPQRSTUVWXYZ23456789'),0,4);171         imagestring($image,5,7,5,$text,$color);172         173         for($i = 0; $i<60; $i++){174             $offset = 3;        //最大波动频率175             $round = 2;         //两个周期176             $posy =round( SIN($i*$round*2*M_PI/60)*$offset);177             imagecopy($d_image,$image,$i,$posy,$i,0,1,25);178         }179         //显示，销毁180         ob_clean();181         header('content-type:image/jpeg');182         imagejpeg($d_image);183         imagedestroy($d_image);184         imagedestroy($image);185         186         return $text;187     }188 }189 //print_r(ImageTool::imageInfo('./sanyecao.jpg'));190 //生成水印图191 /*192 var_dump(ImageTool::water('./sanyecao.jpg','./xiao.png','./aaa1.jpg',0));193 var_dump(ImageTool::water('./sanyecao.jpg','./xiao.png','./aaa2.jpg',1));194 var_dump(ImageTool::water('./sanyecao.jpg','./xiao.png','./aaa3.jpg',2));195 var_dump(ImageTool::water('./sanyecao.jpg','./xiao.png','./aaa4.jpg',3));196  */197 /*198 生成留白的等比例缩略图199  */200 /*201 var_dump(ImageTool::thumb('./sanyecao.jpg','./sanyecao1.jpg',200,200));202 var_dump(ImageTool::thumb('./sanyecao.jpg','./sanyecao2.jpg',200,300));203 var_dump(ImageTool::thumb('./sanyecao.jpg','./sanyecao3.jpg',300,200));204  */205 //生成验证码206 $tool = new ImageTool;207 $aa = $tool -> captcha();208 var_dump($aa);209 ?>

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