1 <?php
2 /**
3 * 调用示例
4 * */
5 session_start();
6 $randCode = '';
7 //验证码随机
8 $str="abcdefghjkmnpqrstuvwsyzABCDEFGHJKMNPQRSTUVWSYZ23456789";
9 for($i=0;$i<4;$i++){
10 $safe.=substr($str,rand(0,strlen($str)),1);
11 }
12 $_SESSION["imgcode"]=$safe;
13 ImageCode($safe, 60); // 显示GIF动画
14
15 /**
16 * ImageCode 生成GIF图片验证
17 * @param $string 字符串
18 * @param $width 宽度
19 * @param $height 高度
20 * */
21 function ImageCode($string = '', $width = 75, $height = 25){
22 $authstr = $string ? $string : ((time() % 2 == 0) ? mt_rand(1000, 9999) : mt_rand(10000, 99999));
23 $board_width = $width;
24 $board_height = $height;
25 // 生成一个32帧的GIF动画
26 for($i = 0; $i < 32; $i++){
27 ob_start();
28 $image = imagecreate($board_width, $board_height);
29 imagecolorallocate($image, 0,0,0);
30 // 设定文字颜色数组
31 $colorList[] = ImageColorAllocate($image, 15,73,210);
32 $colorList[] = ImageColorAllocate($image, 0,64,0);
33 $colorList[] = ImageColorAllocate($image, 0,0,64);
34 $colorList[] = ImageColorAllocate($image, 0,128,128);
35 $colorList[] = ImageColorAllocate($image, 27,52,47);
36 $colorList[] = ImageColorAllocate($image, 51,0,102);
37 $colorList[] = ImageColorAllocate($image, 0,0,145);
38 $colorList[] = ImageColorAllocate($image, 0,0,113);
39 $colorList[] = ImageColorAllocate($image, 0,51,51);
40 $colorList[] = ImageColorAllocate($image, 158,180,35);
41 $colorList[] = ImageColorAllocate($image, 59,59,59);
42 $colorList[] = ImageColorAllocate($image, 0,0,0);
43 $colorList[] = ImageColorAllocate($image, 1,128,180);
44 $colorList[] = ImageColorAllocate($image, 0,153,51);
45 $colorList[] = ImageColorAllocate($image, 60,131,1);
46 $colorList[] = ImageColorAllocate($image, 0,0,0);
47 $fontcolor = ImageColorAllocate($image, 0,0,0);
48 $gray = ImageColorAllocate($image, 245,245,245);
49 $color = imagecolorallocate($image, 255,255,255);
50 $color2 = imagecolorallocate($image, 255,0,0);
51 imagefill($image, 0, 0, $gray);
52 $space = 15;// 字符间距
53 if($i > 0){ // 屏蔽第一帧
54 for ($k = 0; $k < strlen($authstr); $k++) {
55 $colorRandom = mt_rand(0,sizeof($colorList)-1);
56 $float_top = rand(0,4);
57 $float_left = rand(0,3);
58 imagestring($image, 6, $space * $k, $top + $float_top, substr($authstr, $k, 1), $colorList[$colorRandom]);
59 }
60 }
61 for ($k = 0; $k < 20; $k++) {
62 $colorRandom = mt_rand(0,sizeof($colorList)-1);
63 imagesetpixel($image, rand()%70 , rand()%15 , $colorList[$colorRandom]);
64
65 }
66 // 添加干扰线
67 for($k = 0; $k < 5; $k++){
68 $colorRandom = mt_rand(0, sizeof($colorList)-1);
69 // $todrawline = rand(0,1);
70 $todrawline = 1;
71 if($todrawline){
72 imageline($image, mt_rand(0, $board_width), mt_rand(0,$board_height), mt_rand(0,$board_width), mt_rand(0,$board_height), $colorList[$colorRandom]);
73 }else{
74 $w = mt_rand(0,$board_width);
75 $h = mt_rand(0,$board_width);
76 imagearc($image, $board_width - floor($w / 2) , floor($h / 2), $w, $h, rand(90,180), rand(180,270), $colorList[$colorRandom]);
77 }
78 }
79 imagegif($image);
80 imagedestroy($image);
81 $imagedata[] = ob_get_contents();
82 ob_clean();
83 ++$i;
84 }
85 $gif = new GIFEncoder($imagedata);
86 Header ('Content-type:image/gif');
87 echo $gif->GetAnimation();
88 }
89
90
91 /**
92 * GIFEncoder类
93 * */
94 class GIFEncoder {
95 var $GIF = "GIF89a"; /* GIF header 6 bytes */
96 var $VER = "GIFEncoder V2.06"; /* Encoder version */
97 var $BUF = Array ( );
98 var $LOP = 0;
99 var $DIS = 2;
100 var $COL = -1;
101 var $IMG = -1;
102 var $ERR = Array (
103 'ERR00' =>"Does not supported function for only one image!",
104 'ERR01' =>"Source is not a GIF image!",
105 'ERR02' =>"Unintelligible flag ",
106 'ERR03' =>"Could not make animation from animated GIF source",
107 );
108 function GIFEncoder ($GIF_src, $GIF_dly = 100, $GIF_lop = 0, $GIF_dis = 0, $GIF_red = 0, $GIF_grn = 0, $GIF_blu = 0, $GIF_mod = 'bin' ) {
109 if (!is_array($GIF_src) && !is_array($GIF_tim)) {
110 printf ( "%s: %s", $this->VER, $this->ERR['ERR00']);
111 exit( 0 );
112 }
113 $this->LOP = ($GIF_lop > -1) ? $GIF_lop : 0;
114 $this->DIS = ($GIF_dis > -1) ? (( $GIF_dis < 3 ) ? $GIF_dis : 3) : 2;
115 $this->COL = ($GIF_red > -1 && $GIF_grn > -1 && $GIF_blu > -1) ? ($GIF_red | ($GIF_grn << 8) | ($GIF_blu << 16)) : -1;
116
117 for ($i = 0, $src_count = count($GIF_src); $i < $src_count; $i++ ) {
118 if (strToLower( $GIF_mod ) == "url") {
119 $this->BUF[] = fread (fopen($GIF_src [$i], "rb"), filesize ($GIF_src [$i]));
120 }elseif(strToLower($GIF_mod) == "bin") {
121 $this->BUF [ ] = $GIF_src [ $i ];
122 }else{
123 printf("%s: %s ( %s )!", $this->VER, $this->ERR [ 'ERR02' ], $GIF_mod);
124 exit(0);
125 }
126 if (substr($this->BUF[$i], 0, 6) != "GIF87a" && substr($this->BUF [$i], 0, 6) != "GIF89a") {
127 printf( "%s: %d %s", $this->VER, $i, $this->ERR ['ERR01']);
128 exit(0);
129 }
130 for ($j = (13 + 3 * (2 << (ord($this->BUF[$i]{10}) & 0x07 ))), $k = TRUE; $k; $j++){
131 switch ($this->BUF [$i]{$j}) {
132 case "!":
133 if ((substr($this->BUF[$i], ($j + 3), 8)) == "NETSCAPE") {
134 printf( "%s: %s ( %s source )!", $this->VER, $this->ERR ['ERR03'], ($i + 1));
135 exit( 0 );
136 }
137 break;
138 case ";":
139 $k = FALSE;
140 break;
141 }
142 }
143 }
144 GIFEncoder::GIFAddHeader();
145 for($i = 0, $count_buf = count($this->BUF); $i < $count_buf; $i++) {
146 GIFEncoder::GIFAddFrames($i, $GIF_dly[$i]);
147 }
148 GIFEncoder::GIFAddFooter();
149 }
150
151 function GIFAddHeader ( ) {
152 $cmap = 0;
153 if (ord($this->BUF[0]{10}) & 0x80 ) {
154 $cmap = 3 * ( 2 << ( ord ( $this->BUF [ 0 ]{10} ) & 0x07 ));
155
156 $this->GIF .= substr ( $this->BUF [ 0 ], 6, 7);
157 $this->GIF .= substr ( $this->BUF [ 0 ], 13, $cmap);
158 $this->GIF .= "!\377\13NETSCAPE2.0\3\1" . GIFEncoder::GIFWord ( $this->LOP ) . "\0";
159 }
160 }
161
162 function GIFAddFrames ( $i, $d ) {
163 $Locals_str = 13 + 3 * (2 <<(ord($this->BUF[$i]{10}) & 0x07));
164 $Locals_end = strlen($this->BUF[$i]) - $Locals_str - 1;
165 $Locals_tmp = substr ($this->BUF[$i], $Locals_str, $Locals_end);
166 $Global_len = 2 << (ord( $this->BUF [0]{10} ) & 0x07 );
167 $Locals_len = 2 << (ord( $this->BUF[$i]{10}) & 0x07);
168 $Global_rgb = substr($this->BUF[0], 13, 3 * (2 << ( ord ( $this->BUF[0]{10} ) & 0x07)));
169 $Locals_rgb = substr ( $this->BUF[$i], 13, 3 * (2 << ( ord ( $this->BUF[$i]{10} ) & 0x07)));
170 $Locals_ext = "!\xF9\x04" . chr(($this->DIS << 2) + 0) . chr(($d >> 0) & 0xFF) . chr(($d >> 8) & 0xFF) . "\x0\x0";
171 if ( $this->COL > -1 && ord($this->BUF[$i]{10}) & 0x80){
172 for($j = 0; $j < (2 << (ord( $this->BUF[$i]{10}) & 0x07)); $j++ ) {
173 if(ord ($Locals_rgb{3 * $j + 0}) == ($this->COL >> 0) & 0xFF && ord ( $Locals_rgb { 3 * $j + 1 } ) == ( $this->COL >> 8 ) & 0xFF && ord ( $Locals_rgb { 3 * $j + 2 } ) == ( $this->COL >> 16 ) & 0xFF ) {
174 $Locals_ext = "!\xF9\x04" . chr(($this->DIS << 2) + 1) . chr (( $d >> 0) & 0xFF) . chr (( $d >> 8) & 0xFF) . chr ($j) . "\x0";
175 break;
176 }
177 }
178 }
179 switch ( $Locals_tmp { 0 } ) {
180 case "!":
181 $Locals_img = substr($Locals_tmp, 8, 10);
182 $Locals_tmp = substr($Locals_tmp, 18, strlen ($Locals_tmp) - 18);
183 break;
184 case ",":
185 $Locals_img = substr($Locals_tmp, 0, 10);
186 $Locals_tmp = substr($Locals_tmp, 10, strlen($Locals_tmp) - 10);
187 break;
188 }
189 if ( ord ( $this->BUF[$i]{10} ) & 0x80 && $this->IMG > -1 ) {
190 if ( $Global_len == $Locals_len ) {
191 if ( GIFEncoder::GIFBlockCompare ( $Global_rgb, $Locals_rgb, $Global_len ) ) {
192 $this->GIF .= ( $Locals_ext . $Locals_img . $Locals_tmp );
193 }else{
194 $byte = ord ( $Locals_img{9});
195 $byte |= 0x80;
196 $byte &= 0xF8;
197 $byte |= ( ord ( $this->BUF [ 0 ]{10}) & 0x07);
198 $Locals_img{9} = chr($byte);
199 $this->GIF .= ($Locals_ext . $Locals_img . $Locals_rgb . $Locals_tmp);
200 }
201 }else{
202 $byte = ord($Locals_img{9});
203 $byte |= 0x80;
204 $byte &= 0xF8;
205 $byte |= (ord($this->BUF[$i]{10}) & 0x07);
206 $Locals_img {9} = chr($byte);
207 $this->GIF .= ($Locals_ext . $Locals_img . $Locals_rgb . $Locals_tmp);
208 }
209 }else{
210 $this->GIF .= ( $Locals_ext . $Locals_img . $Locals_tmp );
211 }
212 $this->IMG = 1;
213 }
214
215 function GIFAddFooter ( ) {
216 $this->GIF .= ";";
217 }
218
219 function GIFBlockCompare ( $GlobalBlock, $LocalBlock, $Len ) {
220 for ( $i = 0; $i < $Len; $i++ ) {
221 if($GlobalBlock { 3 * $i + 0 } != $LocalBlock { 3 * $i + 0 } || $GlobalBlock { 3 * $i + 1 } != $LocalBlock { 3 * $i + 1 } || $GlobalBlock { 3 * $i + 2 } != $LocalBlock{3 * $i + 2}) {
222 return ( 0 );
223 }
224 }
225 return ( 1 );
226 }
227
228 function GIFWord ( $int ) {
229 return ( chr ( $int & 0xFF ) . chr ( ( $int >> 8 ) & 0xFF ) );
230 }
231
232 function GetAnimation ( ) {
233 return ($this->GIF);
234 }
235 }