不需要GD库的情况下实现验证码,看看这个大家需不需要! 验证码的目的就是要阻止客户端robot的使用,除非你预设的图片足够多否则客户端可以通过捕获图片的字节数实现自动获取验证码 解决方案 » 免费领取超大流量手机卡,每月29元包185G流量+100分钟通话, 中国电信官方发货 snmr_com(麒麟厍人)其实你用FireWork做一些图片你就能看出来!同样大小的图片,如果只是数字不一样的话!大小几乎都是差不多的!都是那几个字节,呵呵,几百张图片,几乎都是一样的!所以robot应该是弄不出来! 我在没有GD库的情况,是这样用的,以下代码感谢唠叨提供一个显示时间的程序,我从这个修改过来的,现在可以显示4位数字随机图片。<?php //生成数字图象的函数 function draw_digit($x, $y, $digit) { global $sx, $sy, $pixels, $digits, $lines; $digit = $digits[$digit]; $m = 8; for ($b = 1, $i = 0; $i < 7; $i++, $b *= 2) { if (($b & $digit) == $b) { $j = $i * 4; $x0 = $lines[$j] * $m + $x; $y0 = $lines[$j + 1] * $m + $y; $x1 = $lines[$j + 2] * $m + $x; $y1 = $lines[$j + 3] * $m + $y; if ($x0 == $x1) { $ofs = 3 * ($sx * $y0 + $x0); for ($h = $y0; $h <= $y1; $h++, $ofs += 3 * $sx) { $pixels[$ofs] = chr(0); $pixels[$ofs + 1] = chr(0); $pixels[$ofs + 2] = chr(0); } } else { $ofs = 3 * ($sx * $y0 + $x0); for ($w = $x0; $w <= $x1; $w++) { $pixels[$ofs++] = chr(0); $pixels[$ofs++] = chr(0); $pixels[$ofs++] = chr(0); } } } } } //将文字加入到图象中 function add_chunk($type) { global $result, $data, $chunk, $crc_table; // chunk :为层 // length: 4 字节: 用来计算 chunk // chunk type: 4 字节 // chunk data: length bytes // CRC: 4 字节: 循环冗余码校验 // copy data and create CRC checksum $len = strlen($data); $chunk = pack("c*", ($len >> 24) & 255, ($len >> 16) & 255, ($len >> 8) & 255, $len & 255); $chunk .= $type; $chunk .= $data; // calculate a CRC checksum with the bytes chunk[4..len-1] $z = 16777215; $z |= 255 << 24; $c = $z; for ($n = 4; $n < strlen($chunk); $n++) { $c8 = ($c >> 8) & 0xffffff; $c = $crc_table[($c ^ ord($chunk[$n])) & 0xff] ^ $c8; } $crc = $c ^ $z; $chunk .= chr(($crc >> 24) & 255); $chunk .= chr(($crc >> 16) & 255); $chunk .= chr(($crc >> 8) & 255); $chunk .= chr($crc & 255); // 将结果加到$result中 $result .= $chunk; } //主程序 //$sx = 80; $sx = strlen($sj)*13+2; $sy = 21; $pixels = ""; // 填充 for ($h = 0; $h < $sy; $h++) { for ($w = 0; $w < $sx; $w++) { $r = 100 / $sx * $w + 155; $g = 100 / $sy * $h + 155; $b = 255 - (100 / ($sx + $sy) * ($w + $h)); $pixels .= chr($r); $pixels .= chr($g); $pixels .= chr($b); } } $digits = array(95, 5, 118, 117, 45, 121, 123, 69, 127, 125); $lines = array(1, 1, 1, 2, 0, 1, 0, 2, 1, 0, 1, 1, 0, 0, 0, 1, 0, 2, 1, 2, 0, 1, 1, 1, 0, 0, 1, 0); function draw($str){ $k = 3; for($j=0; $j<strlen($str); $j++) { draw_digit($k, 2, $str[$j]); $k+=13; } } draw($sj); // 创建循环冗余码校验表 $z = -306674912; // = 0xedb88320 for ($n = 0; $n < 256; $n++) { $c = $n; for ($k = 0; $k < 8; $k++) { $c2 = ($c >> 1) & 0x7fffffff; if ($c & 1) $c = $z ^ ($c2); else $c = $c2; } $crc_table[$n] = $c; } // PNG file signature $result = pack("c*", 137,80,78,71,13,10,26,10); // IHDR chunk data: // width: 4 bytes // height: 4 bytes // bit depth: 1 byte (8 bits per RGB value) // color type: 1 byte (2 = RGB) // compression method: 1 byte (0 = deflate/inflate) // filter method: 1 byte (0 = adaptive filtering) // interlace method: 1 byte (0 = no interlace) $data = pack("c*", ($sx >> 24) & 255, ($sx >> 16) & 255, ($sx >> 8) & 255, $sx & 255, ($sy >> 24) & 255, ($sy >> 16) & 255, ($sy >> 8) & 255, $sy & 255, 8, 2, 0, 0, 0); add_chunk("IHDR"); // 以下不敢乱翻译,请自行参考 // scanline: // filter byte: 0 = none // RGB bytes for the line // the scanline is compressed with "zlib", method 8 (RFC-1950): // compression method/flags code: 1 byte ($78 = method 8, 32k window) // additional flags/check bits: 1 byte ($01: FCHECK = 1, FDICT = 0, FLEVEL = 0) // compressed data blocks: n bytes // one block (RFC-1951): // bit 0: BFINAL: 1 for the last block // bit 1 and 2: BTYPE: 0 for no compression // next 2 bytes: LEN (LSB first) // next 2 bytes: one's complement of LEN // LEN bytes uncompressed data // check value: 4 bytes (Adler-32 checksum of the uncompressed data) // $len = ($sx * 3 + 1) * $sy; $data = pack("c*", 0x78, 0x01, 1, $len & 255, ($len >> 8) & 255, 255 - ($len & 255), 255 - (($len >> 8) & 255)); $start = strlen($data); $i2 = 0; for ($h = 0; $h < $sy; $h++) { $data .= chr(0); for ($w = 0; $w < $sx * 3; $w++) { $data .= $pixels[$i2++]; } } // calculate a Adler32 checksum with the bytes data[start..len-1] $s1 = 1; $s2 = 0; for ($n = $start; $n < strlen($data); $n++) { $s1 = ($s1 + ord($data[$n])) % 65521; $s2 = ($s2 + $s1) % 65521; } $adler = ($s2 << 16) | $s1; $data .= chr(($adler >> 24) & 255); $data .= chr(($adler >> 16) & 255); $data .= chr(($adler >> 8) & 255); $data .= chr($adler & 255); add_chunk("IDAT"); // IEND: s the end of the PNG-file $data = ""; add_chunk("IEND"); // 列印图象 echo($result);?> 我做了10多年图片,当然知道这个,但是你要知道,差一个byte就是区别,而且不要忘了,那个是robot,不是人手,一次错了可以自动试几次,如果图片太少,很容易就破了 一次错了!下一次的图片验证码就变了!它怎么试呢?这个验证码每提交一次就改变一次!如何让能够让robot试几次呀?老大!你说是吗? robot 都能够自动填表,还不能读你的源码吗? 哦我明白了,是看不到图片的文件名.其实我认为,还有一个方法:建立 0-9 这十个文件夹,0 的文件夹里放数字 0 ,1 的文件夹里放数字 1 的图片,可以放多幅不同的.依此类推.然后随机生成一个 4 位数的验证码,保存在 $_SESSION[validate] 中.输出源码:<IMG SRC="{filepath}/validate_image.php?p=0"><IMG SRC="{filepath}/validate_image.php?p=1"><IMG SRC="{filepath}/validate_image.php?p=2"><IMG SRC="{filepath}/validate_image.php?p=3">validate_image.php?p=i 根据 $_SESSION[validate] 读出第 $_GET[p] 位数字到 $n 中,再随机从 $n 目录中读出一幅输出来. 下面就关于图片的字节数问题发表一下看法.请先看一下下面的一篇文章:《用COPY命令加密文本文件小技巧》http://tech.tom.com/1380/1383/200399-58598.html从这时里可以知道,可以在图片的源码在后面写入一些文字,但图片的显示却正常,但文件的大小已经改变了。因此,我们可以通过这个方法,输出字节数完全相同的图片。请各位牛人发表一下自己的看法。 我的意思是说,你不可能做到几百张图片大部分都有相同的byte,即使验证码变换,出现不同的byte 的情况就有相对大的可能,robot这个验证码试不过去,就可以换另一个,只要有迹可寻……gd产生的验证码目的就是把这种痕迹抹杀为什么现在的gd验证码甚至做到变形,改变字符位置,这就是因为自动的OCR robot已经出现,判断字节数已经是过时了,我觉得,能够做“中文验证码”(我的意思是对不同语言使用者用不同字符)就是更高的途径,哈哈 GD+SESSION既然有GD库可以用,又安全,干吗要大费周章呢?APACHE 4.0 以上extension gd2.dll.dz; keaizhong(可爱钟):我天天在用,怎会不可以用,要不我贴个唠叨的原始代码给你们参考这个:不用GD库生成当前时间的PNG格式图象的程序 该程序是不用GD库可以生成当前时间的PNG格式图象,给人大开眼界,很有参考价值. <?php function set_4pixel($r, $g, $b, $x, $y) { global $sx, $sy, $pixels; $ofs = 3 * ($sx * $y + $x); $pixels[$ofs] = chr($r); $pixels[$ofs + 1] = chr($g); $pixels[$ofs + 2] = chr($b); $pixels[$ofs + 3] = chr($r); $pixels[$ofs + 4] = chr($g); $pixels[$ofs + 5] = chr($b); $ofs += 3 * $sx; $pixels[$ofs] = chr($r); $pixels[$ofs + 1] = chr($g); $pixels[$ofs + 2] = chr($b); $pixels[$ofs + 3] = chr($r); $pixels[$ofs + 4] = chr($g); $pixels[$ofs + 5] = chr($b); } //生成数字图象的函数 function draw2digits($x, $y, $number) { draw_digit($x, $y, (int) ($number / 10)); draw_digit($x + 11, $y, $number % 10); } function draw_digit($x, $y, $digit) { global $sx, $sy, $pixels, $digits, $lines; $digit = $digits[$digit]; $m = 8; for ($b = 1, $i = 0; $i < 7; $i++, $b *= 2) { if (($b & $digit) == $b) { $j = $i * 4; $x0 = $lines[$j] * $m + $x; $y0 = $lines[$j + 1] * $m + $y; $x1 = $lines[$j + 2] * $m + $x; $y1 = $lines[$j + 3] * $m + $y; if ($x0 == $x1) { $ofs = 3 * ($sx * $y0 + $x0); for ($h = $y0; $h <= $y1; $h++, $ofs += 3 * $sx) { $pixels[$ofs] = chr(0); $pixels[$ofs + 1] = chr(0); $pixels[$ofs + 2] = chr(0); } } else { $ofs = 3 * ($sx * $y0 + $x0); for ($w = $x0; $w <= $x1; $w++) { $pixels[$ofs++] = chr(0); $pixels[$ofs++] = chr(0); $pixels[$ofs++] = chr(0); } } } } } //将文字加入到图象中 function add_chunk($type) { global $result, $data, $chunk, $crc_table; // chunk :为层 // length: 4 字节: 用来计算 chunk // chunk type: 4 字节 // chunk data: length bytes // CRC: 4 字节: 循环冗余码校验 // copy data and create CRC checksum $len = strlen($data); $chunk = pack("c*", ($len >> 24) & 255, ($len >> 16) & 255, ($len >> 8) & 255, $len & 255); $chunk .= $type; $chunk .= $data; // calculate a CRC checksum with the bytes chunk[4..len-1] $z = 16777215; $z |= 255 << 24; $c = $z; for ($n = 4; $n < strlen($chunk); $n++) { $c8 = ($c >> 8) & 0xffffff; $c = $crc_table[($c ^ ord($chunk][$n])) & 0xff] ^ $c8; } $crc = $c ^ $z; $chunk .= chr(($crc >> 24) & 255); $chunk .= chr(($crc >> 16) & 255); $chunk .= chr(($crc >> 8) & 255); $chunk .= chr($crc & 255); // 将结果加到$result中 $result .= $chunk; } //主程序 $sx = 80; $sy = 21; $pixels = ""; // 填充 for ($h = 0; $h < $sy; $h++) { for ($w = 0; $w < $sx; $w++) { $r = 100 / $sx * $w + 155; $g = 100 / $sy * $h + 155; $b = 255 - (100 / ($sx + $sy) * ($w + $h)); $pixels .= chr($r); $pixels .= chr($g); $pixels .= chr($b); } } $date = getdate(); $s = $date["seconds"]; $m = $date["minutes"]; $h = $date["hours"]; $digits = array(95, 5, 118, 117, 45, 121, 123, 69, 127, 125); $lines = array(1, 1, 1, 2, 0, 1, 0, 2, 1, 0, 1, 1, 0, 0, 0, 1, 0, 2, 1, 2, 0, 1, 1, 1, 0, 0, 1, 0); draw2digits(4, 2, $h); draw2digits(30, 2, $m); draw2digits(56, 2, $s); set_4pixel(0, 0, 0, 26, 7); set_4pixel(0, 0, 0, 26, 13); set_4pixel(0, 0, 0, 52, 7); set_4pixel(0, 0, 0, 52, 13); // 创建循环冗余码校验表 $z = -306674912; // = 0xedb88320 for ($n = 0; $n < 256; $n++) { $c = $n; for ($k = 0; $k < 8; $k++) { $c2 = ($c >> 1) & 0x7fffffff; if ($c & 1) $c = $z ^ ($c2); else $c = $c2; } $crc_table[$n] = $c; } // PNG file signature $result = pack("c*", 137,80,78,71,13,10,26,10); // IHDR chunk data: // width: 4 bytes // height: 4 bytes // bit depth: 1 byte (8 bits per RGB value) // color type: 1 byte (2 = RGB) // compression method: 1 byte (0 = deflate/inflate) // filter method: 1 byte (0 = adaptive filtering) // interlace method: 1 byte (0 = no interlace) $data = pack("c*", ($sx >> 24) & 255, ($sx >> 16) & 255, ($sx >> 8) & 255, $sx & 255, ($sy >> 24) & 255, ($sy >> 16) & 255, ($sy >> 8) & 255, $sy & 255, 8, 2, 0, 0, 0); add_chunk("IHDR"); // 以下不敢乱翻译,请自行参考 // scanline: // filter byte: 0 = none // RGB bytes for the line // the scanline is compressed with "zlib", method 8 (RFC-1950): // compression method/flags code: 1 byte ($78 = method 8, 32k window) // additional flags/check bits: 1 byte ($01: FCHECK = 1, FDICT = 0, FLEVEL = 0) // compressed data blocks: n bytes // one block (RFC-1951): // bit 0: BFINAL: 1 for the last block // bit 1 and 2: BTYPE: 0 for no compression // next 2 bytes: LEN (LSB first) // next 2 bytes: one's complement of LEN // LEN bytes uncompressed data // check value: 4 bytes (Adler-32 checksum of the uncompressed data) // $len = ($sx * 3 + 1) * $sy; $data = pack("c*", 0x78, 0x01, 1, $len & 255, ($len >> 8) & 255, 255 - ($len & 255), 255 - (($len >> 8) & 255)); $start = strlen($data); $i2 = 0; for ($h = 0; $h < $sy; $h++) { $data .= chr(0); for ($w = 0; $w < $sx * 3; $w++) { $data .= $pixels[$i2++]; } } // calculate a Adler32 checksum with the bytes data[start..len-1] $s1 = 1; $s2 = 0; for ($n = $start; $n < strlen($data); $n++) { $s1 = ($s1 + ord($data[$n])) % 65521; $s2 = ($s2 + $s1) % 65521; } $adler = ($s2 << 16) | $s1; $data .= chr(($adler >> 24) & 255); $data .= chr(($adler >> 16) & 255); $data .= chr(($adler >> 8) & 255); $data .= chr($adler & 255); add_chunk("IDAT"); // IEND: s the end of the PNG-file $data = ""; add_chunk("IEND"); // 列印图象 echo($result); ?> //如何调用,其实很简单,将上面存为Timeimg.php //然后新建一个页面如下: <html> <head> <title>test</title> <meta http-equiv="Content-Type" content="text/html"> </head> <body> <img src="Timeimg.php"> //以图象连接方式调用PHP文件 </body> </html> 请教高手 怎样把在wamp5上开发的动态网站移植到linux下 为什么给表加了读锁之后无法把数据查询出来? php输出乱码 请问如何把各视频播放界面嵌入到网页中 用正则改图片的地址路径,我怎么也搞不好,请求帮帮我. session_unset()、session_destory()各有什么功能?有何不同? 求助各位大虾!php上传问题 100分急问:"唠叨" 兄请进, 目前项目需要, 我要搞一个新闻发布系统,简单的购物系统, 多语言 php 在网页间传递数组变量 发送POST请求在request中有以下data内容 如果需要在模板文件中嵌套其它的.htm文件 这个正则表达式怎么写?
同样大小的图片,如果只是数字不一样的话!大小几乎都是差不多的!
都是那几个字节,呵呵,几百张图片,几乎都是一样的!所以robot应该是弄不出来!
//生成数字图象的函数
function draw_digit($x, $y, $digit)
{
global $sx, $sy, $pixels, $digits, $lines;
$digit = $digits[$digit];
$m = 8;
for ($b = 1, $i = 0; $i < 7; $i++, $b *= 2) {
if (($b & $digit) == $b) {
$j = $i * 4;
$x0 = $lines[$j] * $m + $x;
$y0 = $lines[$j + 1] * $m + $y;
$x1 = $lines[$j + 2] * $m + $x;
$y1 = $lines[$j + 3] * $m + $y;
if ($x0 == $x1) {
$ofs = 3 * ($sx * $y0 + $x0);
for ($h = $y0; $h <= $y1; $h++, $ofs += 3 * $sx) {
$pixels[$ofs] = chr(0);
$pixels[$ofs + 1] = chr(0);
$pixels[$ofs + 2] = chr(0);
}
} else {
$ofs = 3 * ($sx * $y0 + $x0);
for ($w = $x0; $w <= $x1; $w++) {
$pixels[$ofs++] = chr(0);
$pixels[$ofs++] = chr(0);
$pixels[$ofs++] = chr(0);
}
}
}
}
}
//将文字加入到图象中
function add_chunk($type)
{
global $result, $data, $chunk, $crc_table;
// chunk :为层
// length: 4 字节: 用来计算 chunk
// chunk type: 4 字节
// chunk data: length bytes
// CRC: 4 字节: 循环冗余码校验
// copy data and create CRC checksum
$len = strlen($data);
$chunk = pack("c*", ($len >> 24) & 255,
($len >> 16) & 255,
($len >> 8) & 255,
$len & 255);
$chunk .= $type;
$chunk .= $data;
// calculate a CRC checksum with the bytes chunk[4..len-1]
$z = 16777215;
$z |= 255 << 24;
$c = $z;
for ($n = 4; $n < strlen($chunk); $n++) {
$c8 = ($c >> 8) & 0xffffff;
$c = $crc_table[($c ^ ord($chunk[$n])) & 0xff] ^ $c8;
}
$crc = $c ^ $z;
$chunk .= chr(($crc >> 24) & 255);
$chunk .= chr(($crc >> 16) & 255);
$chunk .= chr(($crc >> 8) & 255);
$chunk .= chr($crc & 255);
// 将结果加到$result中
$result .= $chunk;
}
//主程序
//$sx = 80;
$sx = strlen($sj)*13+2;
$sy = 21;
$pixels = "";
// 填充
for ($h = 0; $h < $sy; $h++) {
for ($w = 0; $w < $sx; $w++) {
$r = 100 / $sx * $w + 155;
$g = 100 / $sy * $h + 155;
$b = 255 - (100 / ($sx + $sy) * ($w + $h));
$pixels .= chr($r);
$pixels .= chr($g);
$pixels .= chr($b);
}
}
$digits = array(95, 5, 118, 117, 45, 121, 123, 69, 127, 125);
$lines = array(1, 1, 1, 2, 0, 1, 0, 2, 1, 0, 1, 1, 0, 0, 0, 1, 0, 2, 1, 2, 0, 1, 1, 1, 0, 0, 1, 0);
function draw($str){
$k = 3;
for($j=0; $j<strlen($str); $j++) {
draw_digit($k, 2, $str[$j]);
$k+=13;
}
}
draw($sj);
// 创建循环冗余码校验表
$z = -306674912; // = 0xedb88320
for ($n = 0; $n < 256; $n++) {
$c = $n;
for ($k = 0; $k < 8; $k++) {
$c2 = ($c >> 1) & 0x7fffffff;
if ($c & 1) $c = $z ^ ($c2); else $c = $c2;
}
$crc_table[$n] = $c;
}
// PNG file signature
$result = pack("c*", 137,80,78,71,13,10,26,10);
// IHDR chunk data:
// width: 4 bytes
// height: 4 bytes
// bit depth: 1 byte (8 bits per RGB value)
// color type: 1 byte (2 = RGB)
// compression method: 1 byte (0 = deflate/inflate)
// filter method: 1 byte (0 = adaptive filtering)
// interlace method: 1 byte (0 = no interlace)
$data = pack("c*", ($sx >> 24) & 255,
($sx >> 16) & 255,
($sx >> 8) & 255,
$sx & 255,
($sy >> 24) & 255,
($sy >> 16) & 255,
($sy >> 8) & 255,
$sy & 255,
8,
2,
0,
0,
0);
add_chunk("IHDR"); // 以下不敢乱翻译,请自行参考
// scanline:
// filter byte: 0 = none
// RGB bytes for the line
// the scanline is compressed with "zlib", method 8 (RFC-1950):
// compression method/flags code: 1 byte ($78 = method 8, 32k window)
// additional flags/check bits: 1 byte ($01: FCHECK = 1, FDICT = 0, FLEVEL = 0)
// compressed data blocks: n bytes
// one block (RFC-1951):
// bit 0: BFINAL: 1 for the last block
// bit 1 and 2: BTYPE: 0 for no compression
// next 2 bytes: LEN (LSB first)
// next 2 bytes: one's complement of LEN
// LEN bytes uncompressed data
// check value: 4 bytes (Adler-32 checksum of the uncompressed data)
//
$len = ($sx * 3 + 1) * $sy;
$data = pack("c*", 0x78, 0x01,
1,
$len & 255,
($len >> 8) & 255,
255 - ($len & 255),
255 - (($len >> 8) & 255));
$start = strlen($data);
$i2 = 0;
for ($h = 0; $h < $sy; $h++) {
$data .= chr(0);
for ($w = 0; $w < $sx * 3; $w++) {
$data .= $pixels[$i2++];
}
}
// calculate a Adler32 checksum with the bytes data[start..len-1]
$s1 = 1;
$s2 = 0;
for ($n = $start; $n < strlen($data); $n++) {
$s1 = ($s1 + ord($data[$n])) % 65521;
$s2 = ($s2 + $s1) % 65521;
}
$adler = ($s2 << 16) | $s1;
$data .= chr(($adler >> 24) & 255);
$data .= chr(($adler >> 16) & 255);
$data .= chr(($adler >> 8) & 255);
$data .= chr($adler & 255);
add_chunk("IDAT");
// IEND: s the end of the PNG-file
$data = "";
add_chunk("IEND");
// 列印图象
echo($result);
?>
这个验证码每提交一次就改变一次!如何让能够让robot试几次呀?
老大!你说是吗?
其实我认为,还有一个方法:
建立 0-9 这十个文件夹,0 的文件夹里放数字 0 ,1 的文件夹里放数字 1 的图片,可以放多幅不同的.依此类推.
然后随机生成一个 4 位数的验证码,保存在 $_SESSION[validate] 中.输出源码:
<IMG SRC="{filepath}/validate_image.php?p=0"><IMG SRC="{filepath}/validate_image.php?p=1"><IMG SRC="{filepath}/validate_image.php?p=2"><IMG SRC="{filepath}/validate_image.php?p=3">validate_image.php?p=i 根据 $_SESSION[validate] 读出第 $_GET[p] 位数字到 $n 中,再随机从 $n 目录中读出一幅输出来.
请先看一下下面的一篇文章:
《用COPY命令加密文本文件小技巧》
http://tech.tom.com/1380/1383/200399-58598.html
从这时里可以知道,可以在图片的源码在后面写入一些文字,但图片的显示却正常,但文件的大小已经改变了。
因此,我们可以通过这个方法,输出字节数完全相同的图片。
请各位牛人发表一下自己的看法。
既然有GD库可以用,又安全,干吗要大费周章呢?
APACHE 4.0 以上
extension gd2.dll.dz;
不用GD库生成当前时间的PNG格式图象的程序
该程序是不用GD库可以生成当前时间的PNG格式图象,给人大开眼界,很有参考价值. <?php
function set_4pixel($r, $g, $b, $x, $y)
{
global $sx, $sy, $pixels; $ofs = 3 * ($sx * $y + $x);
$pixels[$ofs] = chr($r);
$pixels[$ofs + 1] = chr($g);
$pixels[$ofs + 2] = chr($b);
$pixels[$ofs + 3] = chr($r);
$pixels[$ofs + 4] = chr($g);
$pixels[$ofs + 5] = chr($b);
$ofs += 3 * $sx;
$pixels[$ofs] = chr($r);
$pixels[$ofs + 1] = chr($g);
$pixels[$ofs + 2] = chr($b);
$pixels[$ofs + 3] = chr($r);
$pixels[$ofs + 4] = chr($g);
$pixels[$ofs + 5] = chr($b);
}
//生成数字图象的函数
function draw2digits($x, $y, $number)
{
draw_digit($x, $y, (int) ($number / 10));
draw_digit($x + 11, $y, $number % 10);
}
function draw_digit($x, $y, $digit)
{
global $sx, $sy, $pixels, $digits, $lines;
$digit = $digits[$digit];
$m = 8;
for ($b = 1, $i = 0; $i < 7; $i++, $b *= 2) {
if (($b & $digit) == $b) {
$j = $i * 4;
$x0 = $lines[$j] * $m + $x;
$y0 = $lines[$j + 1] * $m + $y;
$x1 = $lines[$j + 2] * $m + $x;
$y1 = $lines[$j + 3] * $m + $y;
if ($x0 == $x1) {
$ofs = 3 * ($sx * $y0 + $x0);
for ($h = $y0; $h <= $y1; $h++, $ofs += 3 * $sx) {
$pixels[$ofs] = chr(0);
$pixels[$ofs + 1] = chr(0);
$pixels[$ofs + 2] = chr(0);
}
} else {
$ofs = 3 * ($sx * $y0 + $x0);
for ($w = $x0; $w <= $x1; $w++) {
$pixels[$ofs++] = chr(0);
$pixels[$ofs++] = chr(0);
$pixels[$ofs++] = chr(0);
}
}
}
}
}
//将文字加入到图象中
function add_chunk($type)
{
global $result, $data, $chunk, $crc_table; // chunk :为层
// length: 4 字节: 用来计算 chunk
// chunk type: 4 字节
// chunk data: length bytes
// CRC: 4 字节: 循环冗余码校验
// copy data and create CRC checksum
$len = strlen($data);
$chunk = pack("c*", ($len >> 24) & 255,
($len >> 16) & 255,
($len >> 8) & 255,
$len & 255);
$chunk .= $type;
$chunk .= $data; // calculate a CRC checksum with the bytes chunk[4..len-1]
$z = 16777215;
$z |= 255 << 24;
$c = $z;
for ($n = 4; $n < strlen($chunk); $n++) {
$c8 = ($c >> 8) & 0xffffff;
$c = $crc_table[($c ^ ord($chunk][$n])) & 0xff] ^ $c8;
}
$crc = $c ^ $z; $chunk .= chr(($crc >> 24) & 255);
$chunk .= chr(($crc >> 16) & 255);
$chunk .= chr(($crc >> 8) & 255);
$chunk .= chr($crc & 255); // 将结果加到$result中
$result .= $chunk;
}
//主程序 $sx = 80;
$sy = 21;
$pixels = "";
// 填充
for ($h = 0; $h < $sy; $h++) {
for ($w = 0; $w < $sx; $w++) {
$r = 100 / $sx * $w + 155;
$g = 100 / $sy * $h + 155;
$b = 255 - (100 / ($sx + $sy) * ($w + $h));
$pixels .= chr($r);
$pixels .= chr($g);
$pixels .= chr($b);
}
}
$date = getdate();
$s = $date["seconds"];
$m = $date["minutes"];
$h = $date["hours"];
$digits = array(95, 5, 118, 117, 45, 121, 123, 69, 127, 125);
$lines = array(1, 1, 1, 2, 0, 1, 0, 2, 1, 0, 1, 1, 0, 0, 0, 1, 0, 2, 1, 2, 0, 1, 1, 1, 0, 0, 1, 0);
draw2digits(4, 2, $h);
draw2digits(30, 2, $m);
draw2digits(56, 2, $s);
set_4pixel(0, 0, 0, 26, 7);
set_4pixel(0, 0, 0, 26, 13);
set_4pixel(0, 0, 0, 52, 7);
set_4pixel(0, 0, 0, 52, 13); // 创建循环冗余码校验表
$z = -306674912; // = 0xedb88320
for ($n = 0; $n < 256; $n++) {
$c = $n;
for ($k = 0; $k < 8; $k++) {
$c2 = ($c >> 1) & 0x7fffffff;
if ($c & 1) $c = $z ^ ($c2); else $c = $c2;
}
$crc_table[$n] = $c;
} // PNG file signature
$result = pack("c*", 137,80,78,71,13,10,26,10);
// IHDR chunk data:
// width: 4 bytes
// height: 4 bytes
// bit depth: 1 byte (8 bits per RGB value)
// color type: 1 byte (2 = RGB)
// compression method: 1 byte (0 = deflate/inflate)
// filter method: 1 byte (0 = adaptive filtering)
// interlace method: 1 byte (0 = no interlace)
$data = pack("c*", ($sx >> 24) & 255,
($sx >> 16) & 255,
($sx >> 8) & 255,
$sx & 255,
($sy >> 24) & 255,
($sy >> 16) & 255,
($sy >> 8) & 255,
$sy & 255,
8,
2,
0,
0,
0);
add_chunk("IHDR"); // 以下不敢乱翻译,请自行参考
// scanline:
// filter byte: 0 = none
// RGB bytes for the line
// the scanline is compressed with "zlib", method 8 (RFC-1950):
// compression method/flags code: 1 byte ($78 = method 8, 32k window)
// additional flags/check bits: 1 byte ($01: FCHECK = 1, FDICT = 0, FLEVEL = 0)
// compressed data blocks: n bytes
// one block (RFC-1951):
// bit 0: BFINAL: 1 for the last block
// bit 1 and 2: BTYPE: 0 for no compression
// next 2 bytes: LEN (LSB first)
// next 2 bytes: one's complement of LEN
// LEN bytes uncompressed data
// check value: 4 bytes (Adler-32 checksum of the uncompressed data)
//
$len = ($sx * 3 + 1) * $sy;
$data = pack("c*", 0x78, 0x01,
1,
$len & 255,
($len >> 8) & 255,
255 - ($len & 255),
255 - (($len >> 8) & 255));
$start = strlen($data);
$i2 = 0;
for ($h = 0; $h < $sy; $h++) {
$data .= chr(0);
for ($w = 0; $w < $sx * 3; $w++) {
$data .= $pixels[$i2++];
}
}
// calculate a Adler32 checksum with the bytes data[start..len-1]
$s1 = 1;
$s2 = 0;
for ($n = $start; $n < strlen($data); $n++) {
$s1 = ($s1 + ord($data[$n])) % 65521;
$s2 = ($s2 + $s1) % 65521;
}
$adler = ($s2 << 16) | $s1; $data .= chr(($adler >> 24) & 255);
$data .= chr(($adler >> 16) & 255);
$data .= chr(($adler >> 8) & 255);
$data .= chr($adler & 255);
add_chunk("IDAT"); // IEND: s the end of the PNG-file
$data = "";
add_chunk("IEND"); // 列印图象
echo($result);
?> //如何调用,其实很简单,将上面存为Timeimg.php
//然后新建一个页面如下: <html>
<head>
<title>test</title>
<meta http-equiv="Content-Type" content="text/html">
</head>
<body>
<img src="Timeimg.php"> //以图象连接方式调用PHP文件
</body>
</html>