php生成动态验证码gif图片

这是一个通过php生成的动态验证码图片的示例，重点是可以运行哦！下面先发下效果图：

下面是php生成动态验证码需要用到的相关类和函数。

100

101

102

103

104

105

106

107

108

109

110

111

112

113

114

115

116

117

118

119

120

121

122

123

124

125

126

127

128

129

130

131

132

133

134

135

136

137

138

139

140

141

142

143

144

145

146

147

148

149

150

151

152

153

154

155

156

157

158

159

160

161

162

163

164

165

166

167

168

169

170

171

172

173

174

175

176

177

178

179

180

181

182

183

184

185

186

187

188

189

190

191

192

193

194

195

196

197

198

199

200

201

202

203

204

205

206

207

208

209

210

211

212

213

214

215

<?php

/**

*ImageCode 生成包含验证码的GIF图片的函数

*@param $string 字符串

*@param $width 宽度

*@param $height 高度

**/

function ImageCode($string='',$width=75,$height=25){

$authstr=$string?$string:((time()%2==0)?mt_rand(1000,9999):mt_rand(10000,99999));

$board_width=$width;

$board_height=$height;

// 生成一个32帧的GIF动画

for($i=0;$i<32;$i++){

ob_start();

$image=imagecreate($board_width,$board_height);

imagecolorallocate($image,0,0,0);

// 设定文字颜色数组

$colorList[]=ImageColorAllocate($image,15,73,210);

$colorList[]=ImageColorAllocate($image,0,64,0);

$colorList[]=ImageColorAllocate($image,0,0,64);

$colorList[]=ImageColorAllocate($image,0,128,128);

$colorList[]=ImageColorAllocate($image,27,52,47);

$colorList[]=ImageColorAllocate($image,51,0,102);

$colorList[]=ImageColorAllocate($image,0,0,145);

$colorList[]=ImageColorAllocate($image,0,0,113);

$colorList[]=ImageColorAllocate($image,0,51,51);

$colorList[]=ImageColorAllocate($image,158,180,35);

$colorList[]=ImageColorAllocate($image,59,59,59);

$colorList[]=ImageColorAllocate($image,0,0,0);

$colorList[]=ImageColorAllocate($image,1,128,180);

$colorList[]=ImageColorAllocate($image,0,153,51);

$colorList[]=ImageColorAllocate($image,60,131,1);

$colorList[]=ImageColorAllocate($image,0,0,0);

$fontcolor=ImageColorAllocate($image,0,0,0);

$gray=ImageColorAllocate($image,245,245,245);

$color=imagecolorallocate($image,255,255,255);

$color2=imagecolorallocate($image,255,0,0);

imagefill($image,0,0,$gray);

$space=15;// 字符间距

if($i>0){// 屏蔽第一帧

$top=0;

for($k=0;$k<strlen($authstr);$k++){

$colorRandom=mt_rand(0,sizeof($colorList)-1);

$float_top=rand(0,4);

$float_left=rand(0,3);

imagestring($image,6,$space*$k,$top+$float_top,substr($authstr,$k,1),$colorList[$colorRandom]);

}

for($k=0;$k<20;$k++){

$colorRandom=mt_rand(0,sizeof($colorList)-1);

imagesetpixel($image,rand()%70,rand()%15,$colorList[$colorRandom]);

}

// 添加干扰线

for($k=0;$k<3;$k++){

$colorRandom=mt_rand(0,sizeof($colorList)-1);

$todrawline=1;

if($todrawline){

imageline($image,mt_rand(0,$board_width),mt_rand(0,$board_height),mt_rand(0,$board_width),mt_rand(0,$board_height),$colorList[$colorRandom]);

}else{

$w=mt_rand(0,$board_width);

$h=mt_rand(0,$board_width);

imagearc($image,$board_width-floor($w / 2),floor($h / 2),$w,$h, rand(90,180),rand(180,270),$colorList[$colorRandom]);

}

imagegif($image);

imagedestroy($image);

$imagedata[]=ob_get_contents();

ob_clean();

++$i;

}

$gif=new GIFEncoder($imagedata);

Header('Content-type:image/gif');

echo $gif->GetAnimation();

}

/**

*GIFEncoder类

**/

Class GIFEncoder{

var $GIF="GIF89a"; /* GIF header 6 bytes */

var $VER="GIFEncoder V2.06"; /* Encoder version */

var $BUF=Array();

var $LOP=0;

var $DIS=2;

var $COL=-1;

var $IMG=-1;

var $ERR=Array(

'ERR00'=>"Does not supported function for only one image!",

'ERR01'=>"Source is not a GIF image!",

'ERR02'=>"Unintelligible flag ",

'ERR03'=>"Could not make animation from animated GIF source",

);

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'){

if(!is_array($GIF_src)&&!is_array($GIF_tim)){

printf("%s: %s",$this->VER,$this->ERR['ERR00']);

exit(0);

}

$this->LOP=($GIF_lop>-1)?$GIF_lop:0;

$this->DIS=($GIF_dis>-1)?(($GIF_dis<3)?$GIF_dis:3):2;

$this->COL=($GIF_red>-1&&$GIF_grn>-1&&$GIF_blu>-1)?($GIF_red |($GIF_grn<<8)|($GIF_blu<<16)):-1;

for($i=0,$src_count=count($GIF_src);$i<$src_count;$i++){

if(strToLower($GIF_mod)=="url"){

$this->BUF[]=fread(fopen($GIF_src [$i],"rb"),filesize($GIF_src [$i]));

}elseif(strToLower($GIF_mod)=="bin"){

$this->BUF [ ]=$GIF_src [ $i ];

}else{

printf("%s: %s(%s)!",$this->VER,$this->ERR [ 'ERR02' ],$GIF_mod);

exit(0);

}

if(substr($this->BUF[$i],0,6)!="GIF87a"&&substr($this->BUF [$i],0,6)!="GIF89a"){

printf("%s: %d %s",$this->VER,$i,$this->ERR ['ERR01']);

exit(0);

}

for($j=(13+3*(2<<(ord($this->BUF[$i]{10})&0x07))),$k=TRUE;$k;$j++){

switch($this->BUF [$i]{$j}){

case "!":

if((substr($this->BUF[$i],($j+3),8))=="NETSCAPE"){

printf("%s: %s(%s source)!",$this->VER,$this->ERR ['ERR03'],($i+1));

exit(0);

}

break;

case ";":

$k=FALSE;

break;

}

GIFEncoder::GIFAddHeader();

for($i=0,$count_buf=count($this->BUF);$i<$count_buf;$i++){

GIFEncoder::GIFAddFrames($i,$GIF_dly[$i]);

}

GIFEncoder::GIFAddFooter();

}

function GIFAddHeader(){

$cmap=0;

if(ord($this->BUF[0]{10})&0x80){

$cmap=3*(2<<(ord($this->BUF [0]{10})&0x07));

$this->GIF.=substr($this->BUF [0],6,7);

$this->GIF.=substr($this->BUF [0],13,$cmap);

$this->GIF.="!\\377\\13NETSCAPE2.0\\3\\1".GIFEncoder::GIFWord($this->LOP)."\\0";

}

function GIFAddFrames($i,$d){

$Locals_str=13+3*(2 <<(ord($this->BUF[$i]{10})&0x07));

$Locals_end=strlen($this->BUF[$i])-$Locals_str-1;

$Locals_tmp=substr($this->BUF[$i],$Locals_str,$Locals_end);

$Global_len=2<<(ord($this->BUF [0]{10})&0x07);

$Locals_len=2<<(ord($this->BUF[$i]{10})&0x07);

$Global_rgb=substr($this->BUF[0],13,3*(2<<(ord($this->BUF[0]{10})&0x07)));

$Locals_rgb=substr($this->BUF[$i],13,3*(2<<(ord($this->BUF[$i]{10})&0x07)));

$Locals_ext="!\\xF9\\x04".chr(($this->DIS<<2)+0).chr(($d>>0)&0xFF).chr(($d>>8)&0xFF)."\\x0\\x0";

if($this->COL>-1&&ord($this->BUF[$i]{10})&0x80){

for($j=0;$j<(2<<(ord($this->BUF[$i]{10})&0x07));$j++){

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){

$Locals_ext="!\\xF9\\x04".chr(($this->DIS<<2)+1).chr(($d>>0)&0xFF).chr(($d>>8)&0xFF).chr($j)."\\x0";

break;

}

switch($Locals_tmp{0}){

case "!":

$Locals_img=substr($Locals_tmp,8,10);

$Locals_tmp=substr($Locals_tmp,18,strlen($Locals_tmp)-18);

break;

case ",":

$Locals_img=substr($Locals_tmp,0,10);

$Locals_tmp=substr($Locals_tmp,10,strlen($Locals_tmp)-10);

break;

}

if(ord($this->BUF[$i]{10})&0x80&&$this->IMG>-1){

if($Global_len==$Locals_len){

if(GIFEncoder::GIFBlockCompare($Global_rgb,$Locals_rgb,$Global_len)){

$this->GIF.=($Locals_ext.$Locals_img.$Locals_tmp);

}else{

$byte=ord($Locals_img{9});

$byte|=0x80;

$byte&=0xF8;

$byte|=(ord($this->BUF [0]{10})&0x07);

$Locals_img{9}=chr($byte);

$this->GIF.=($Locals_ext.$Locals_img.$Locals_rgb.$Locals_tmp);

}

}else{

$byte=ord($Locals_img{9});

$byte|=0x80;

$byte&=0xF8;

$byte|=(ord($this->BUF[$i]{10})&0x07);

$Locals_img {9}=chr($byte);

$this->GIF.=($Locals_ext.$Locals_img.$Locals_rgb.$Locals_tmp);

}

}else{

$this->GIF.=($Locals_ext.$Locals_img.$Locals_tmp);

}

$this->IMG=1;

}

function GIFAddFooter(){

$this->GIF.=";";

}

function GIFBlockCompare($GlobalBlock,$LocalBlock,$Len){

for($i=0;$i<$Len;$i++){

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}){

return(0);

}

return(1);

}

function GIFWord($int){

return(chr($int&0xFF).chr(($int>>8)&0xFF));

}

function GetAnimation(){

return($this->GIF);

}

php生成动态验证码用法示例：

php生成动态验证码gif图片

相关文章

快网idc优惠网

相关文章

微信

快网idc优惠网

QQ交流群