预览效果：
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 | <?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); } } |
1 2 3 4 5 6 7 8 9 | /*调用示例*/session_start();$checkCode='';$chars='abcdefghjkmnpqrstuvwxyzABCDEFGHJKLMNPRSTUVWXYZ23456789';for($i=0;$i<4;$i++){ $checkCode.=substr($chars,mt_rand(0,strlen($chars)-1),1);}$_SESSION['code']=strtoupper($checkCode);// 记录sessionImageCode($checkCode,60);// 显示GIF动画 |
