【200分】请问如何生成免GD库的图片验证码? 这个不难吧?用XMB比较简单的 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 用图片仅仅是预防被机器人分析,所以象Yahoo等站点的验证码都是不规则的,其实不用图片也可以做到,随机生成的字符串加HTML标记搅拌一下就可以了,要求不是很严格的情况下一般是比较有效的。 随机产生一个字串,然后用gd显示出来就可以了。并做一个hidden的input。提交时候判断就可以了。很简单的了。 这里有篇文章,应该对楼主有所帮助http://phpabc.com/html/2004/12/25/1351.shtml feiyangbahu(飞扬跋扈) ( ) 信誉:100 2005-01-09 00:02:00 得分: 0 用图片仅仅是预防被机器人分析,所以象Yahoo等站点的验证码都是不规则的,其实不用图片也可以做到,随机生成的字符串加HTML标记搅拌一下就可以了,要求不是很严格的情况下一般是比较有效的。 --------------------- 字符串加HTML标记,不是更容易给机器人分析出来吗?好像根本不用分析,直接读出来就是了 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> 把GD库打开对PHP的其它东西会不会有影响,安全性方面呢? 唠叨大哥啊,我执行出错啊$c = $crc_table[($c ^ ord($chunk][$n])) & 0xff] ^ $c8;这行出错Parse error: parse error in /home/www/aspsun/www/t.php on line 87 把$c = $crc_table[($c ^ ord($chunk][$n])) & 0xff] ^ $c8; 改为$c = $crc_table[($c ^ ord($chunk[$n])) & 0xff] ^ $c8; 怎么会多了个“]”? IE下就是不能正常操作,求高手指点 smarty模板问题 急!mysql数据库连接问题! 求教,关于随机生成的问题 PHP对oracle的操作哪个函数的功能和mysql_num_fields相同? 高分請教郵件附件不能正確顯示的問題 请问有没有用JAVA或PHP开发的Blog,类似L-Blog 数据库读出的文本开头的空格为什么不能显示? php执行sql返回值问题 MAC上配置PHP环境以后验证码无法显示 winxp的php中根路径的问题,请进来帮忙看看 php 输出图像乱码,求大家帮忙?
http://phpabc.com/html/2004/12/25/1351.shtml
用图片仅仅是预防被机器人分析,所以象Yahoo等站点的验证码都是不规则的,其实不用图片也可以做到,随机生成的字符串加HTML标记搅拌一下就可以了,要求不是很严格的情况下一般是比较有效的。
---------------------
字符串加HTML标记,不是更容易给机器人分析出来吗?好像根本不用分析,直接读出来就是了
不用GD库生成当前时间的PNG格式图象的程序
该程序是不用GD库可以生成当前时间的PNG格式图象,给人大开眼界,很有参考价值. <?php
function set_4pixel($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>
我执行出错啊
$c = $crc_table[($c ^ ord($chunk][$n])) & 0xff] ^ $c8;
这行出错
Parse error: parse error in /home/www/aspsun/www/t.php on line 87
$c = $crc_table[($c ^ ord($chunk][$n])) & 0xff] ^ $c8;
改为
$c = $crc_table[($c ^ ord($chunk[$n])) & 0xff] ^ $c8;
怎么会多了个“]”?