1 <?php
2 /*如何知道图片的类型和大
3 * 利用getimagesize（），获得以下属性
4 Array
5 (
6 [0] => 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<br/>';
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 ?>
