<?
php
/**
* 调用示例
* */
session_start();
$randCode = ''
;
//验证码随机
$str="abcdefghjkmnpqrstuvwsyzABCDEFGHJKMNPQRSTUVWSYZ23456789"
;
for(
$i=0;
$i<4;
$i++
){
$safe.=
substr(
$str,
rand(0,
strlen(
$str)),1
);
}
$_SESSION["imgcode"]=
$safe;
ImageCode($safe, 60);
// 显示GIF动画
/**
* ImageCode 生成GIF图片验证
* @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
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 < 5;
$k++
){
$colorRandom =
mt_rand(0,
sizeof(
$colorList)-1
);
// $todrawline = rand(0,1);
$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);
}
}
转载于:https://www.cnblogs.com/whlives/p/3880978.html
相关资源：PHP使用GIFEncoder类生成的GIF动态图片验证码
