在php中要生成中文验证码就必须做与生成验证验证码不一样的操作,因为GD函数只接受UTF8格式编码的文字,所以在用php生成中文验证码时面要前首先要进行编码转换,操作php的iconv可以实例.
php 中文验证码生成与调用方法,代码如下:
- $ch_str="你要生成中文验证码汉字";
- $str=array();
- for ($i=0;$i<strlen($ch_str);$i+=3)
- {
- $str[]=$ch_str[$i].$ch_str[$i+1].$ch_str[$i+2];
- }
-
- $image_x=200;
- $image_y=100;
- $im = imagecreate($image_x,$image_y);
-
- $bkg = imagecolorallocate($im,255,255,255);
-
- $fnt = "simfang.ttf";
-
- $white=imagecolorallocate($im,234,185,95);
-
- imagearc($im, 150, 8, 20, 20, 75, 170, $white);
- imagearc($im, 180, 7,50, 30, 75, 175, $white);
-
- imageline($im,20,20,180,30,$white);
- imageline($im,20,18,170,50,$white);
- imageline($im,25,50,80,50,$white);
-
- $noise_num=3000;
- $line_num=80;
-
- $rectangle_color=imagecolorallocate($im,0xaa,0xaa,0xaa);
- $noise_color=imagecolorallocate($im,0x00,0x00,0x00);
- $font_color=imagecolorallocate($im,0x00,0x00,0x00);
- for($i=0;$i<$noise_num;$i++)
- {
-
- imagesetpixel($im,mt_rand(0,$image_x),mt_rand(0,$image_y),$noise_color);
- }
-
- for($i=0;$i<$line_num;$i++)
- {
- $line_color=imagecolorallocate($im,mt_rand(0,255),mt_rand(0,255),mt_rand(0,255));
-
- imageline($im,mt_rand(0,$image_x),mt_rand(0,$image_y),mt_rand(0,$image_x),mt_rand(0,$image_y),$line_color);
- }
- $randnum=rand(0,count($str)-4);
-
- if ($randnum%2)
- {
- $randnum+=1;
- }
- $str1=$str[$randnum].$str[$randnum+1];
- for ($i=0;$i<2;$i++)
- {
- imagettftext($im, rand(28,32), rand(0,70), rand(($image_x/4)*$i+$image_x/10,($image_x/4)*$i+$image_x/8), rand($image_y/2+$image_y/10,$image_y/2+$image_y/5), $font_color, $fnt, $str[$randnum+$i]);
- }
- imagepng($im);
- imagedestroy($im);
-
-
- $str="中文汉字";
- $image_x=110;
- $image_y=110;
- $im = imagecreate($image_x,$image_y);
- $bkg = imagecolorallocate($im,255,255,255);
- $fnt = "hb.ttf";
- $white=imagecolorallocate($im,234,185,95);
- imagearc($im, 150, 8, 20, 20, 75, 170, $white);
- imagearc($im, 180, 7,50, 30, 75, 175, $white);
- imageline($im,20,20,180,30,$white);
- imageline($im,20,18,170,50,$white);
- imageline($im,25,50,80,50,$white);
- $noise_num=3000;
- $line_num=80;
- imagecolorallocate($im,0xff,0xff,0xff);
- $rectangle_color=imagecolorallocate($im,0xaa,0xaa,0xaa);
- $noise_color=imagecolorallocate($im,0x00,0x00,0x00);
- $font_color=imagecolorallocate($im,0x00,0x00,0x00);
- $line_color=imagecolorallocate($im,0x00,0x00,0x00);
- for($i=0;$i<$noise_num;$i++)
- imagesetpixel($im,mt_rand(0,$image_x),mt_rand(0,$image_y),$noise_color);
- for($i=0;$i<$line_num;$i++)
- imageline($im,mt_rand(0,$image_x),mt_rand(0,$image_y),mt_rand(0,$image_x),mt_rand(0,$image_y),$line_color);
- $randnum=rand(0,strlen($str)-4);
- if ($randnum%2)$randnum+=1;
- $str1=substr($str,$randnum,4);
- $str2 = iconv("gb2312","utf-8",$str1);
-
- imagettftext($im, rand(28,32), rand(0,70), rand(25,27), rand(70,100), $font_color, $fnt, $str2);
- imagepng($im);
- imagedestroy($im);
-
-
-
-
-
-
- $randcode=array('宠');
- $codetable=array();
- $fp=fopen("gb2312.txt","r");
- while($line=fgets($fp))
- $codetable[hexdec(substr($line,0,6))]=substr($line,7,6);
- fclose($fp);
-
-
- function gb2utf8($gbstr)
- {
- global $codetable;
- if(trim($gbstr)=="")
- return $gbstr;
- $ret="";
- $utf8="";
- while($gbstr)
- {
- if(ord(substr($gbstr,0,1))>127)
- {
- $thisw=substr($gbstr,0,2);
- $gbstr=substr($gbstr,2,strlen($gbstr));
- $utf8="";
- @$utf8=u2utf8(hexdec($codetable[hexdec(bin2hex($thisw))-0x8080]));
-
-
-
- if($utf8!="")
- for($i=0;$i<strlen($utf8);$i+=3)
- $ret.=chr(substr($utf8,$i,3));
- }
- else
- {
- $ret.=substr($gbstr,0,1);
- $gbstr=substr($gbstr,1,strlen($gbstr));
- }
- }
- return $ret;
- }
-
-
-
- function u2utf8($c)
- {
- $str="";
- if($c<0x80)
- $str.=$c;
- elseif($c<0x800)
- {
- $str.=(0xc0|$c>>6);
- $str.=(0x80|$c&0x3f);
- }
- elseif($c<0x10000)
- {
- $str.=(0xe0|$c>>12);
- $str.=(0x80|$c>>6&0x3f);
- $str.=(0x80|$c&0x3f);
- }
- elseif($c<0x200000)
- {
- $str.=(0xf0|$c>>18);
- $str.=(0x80|$c>>12&0x3f);
-
-
-
- $str.=(0x80|$c>>6&0x3f);
- $str.=(0x80|$c&0x3f);
- }
- return $str;
- }
-
-
- function create_excode($length)
- {
- global $randcode;
- header("content-type: image/png");
- $image_x=$length*30;
- $image_y=40;
- $noise_num=80*$length;
- $line_num=$length-2;
- $image=imagecreate($image_x,$image_y);
- imagecolorallocate($image,0xff,0xff,0xff);
- $rectangle_color=imagecolorallocate($image,0xaa,0xaa,0xaa);
- $noise_color=imagecolorallocate($image,0x00,0x00,0x00);
- $font_color=imagecolorallocate($image,0x00,0x00,0x00);
- $line_color=imagecolorallocate($image,0x33,0x33,0x33);
-
-
- for($i=0;$i<$noise_num;$i++)
- imagesetpixel($image,mt_rand(0,$image_x),mt_rand(0,$image_y),$noise_color);
-
- $font_face="simkai.ttf";
- $x=2;
- $session_code='';
- for($i=0;$i<$length;$i++)
- {
- $code=$randcode[mt_rand(0,count($randcode)-1)];
- imagettftext($image,18,mt_rand(-6,6),$x,29,$font_color,$font_face,gb2utf8($code));
- $x+=30;
- $session_code.=$code;
- }
- @session_start();
- $_session['excode']=$session_code;
-
-
-
- for($i=0;$i<$line_num;$i++)
- imageline($image,mt_rand(0,$image_x),mt_rand(0,$image_y),
- mt_rand(0,$image_x),mt_rand(0,$image_y),$line_color);
- imagerectangle($image,0,0,$image_x-1,$image_y-1,$rectangle_color);
- imagepng($image);
- imagedestroy($image);
- }
- create_excode(6);
使用的时候直接用html语法:<img src="excode.php">调用就可以了,在服务端做验证时取session存储的验证字符与用户提交的字符进行比较,相同则通过验证. |