超强php验证码升级版 超强php验证码升级版识别难度更大<?php function getCode($length = 32, $mode = 0) { switch ($mode) { case '1' : $str = '123456789'; break; case '2' : $str = 'abcdefghijklmnopqrstuvwxyz'; break; case '3' : $str = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'; break; case '4' : $str = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz'; break; case '5' : $str = 'ABCDEFGHIJKLMNPQRSTUVWXYZ123456789'; break; case '6' : $str = 'abcdefghijklmnopqrstuvwxyz1234567890'; break; case '7' ://中文验证码 break; default : $str = 'ABCDEFGHIJKLMNPQRSTUVWXYZabcdefghijkmnpqrstuvwxyz23456789'; break; } $result = ''; for($i = 0; $i < $length; $i ++) { if ($mode == 7) { $str [$i] = chr ( mt_rand ( 176, 215 ) ) . chr ( mt_rand ( 161, 249 ) ); $str [$i] = iconv ( "GB2312", "UTF-8", $str [$i] ); //imagettftext是utf-8的,所以先转换下 $result .= $str [$i]; } else { $l = strlen ( $str ) - 1; $num = mt_rand ( 0, $l ); $result .= $str [$num]; } } return $result; } //建立验证图片 function createAuthNumImg($randStr, $fontName, $imgW = 100, $imgH = 40) { header ( "content-type: image/png" ); $image = imagecreate ( $imgW, $imgH ); $fontSize = mt_rand(17,20);//字号 //$green = imagecolorallocate($image,0x6b,0xc1,0x46); $gray = imagecolorallocate ( $image, 255, 255, 255 ); //灰色 $red = imagecolorallocate ( $image, 255, 102, 204 );//粉色 $blue = imagecolorallocate($image,0x53,0x68,0xbd); $colors = array($red, $gray, $blue); $color_b = imagecolorallocate ( $image, 0, 0, 0 ); //黑色 $color_d = imagecolorallocate ( $image,98,178, 28 ); //绿色 $color_e = imagecolorallocate ( $image,38,98, 223 ); //蓝色 $color_c = imagecolorallocate ( $image,255,0, 0 ); //红色 $color_f = imagecolorallocate ( $image,128,0, 255 ); //紫色 $color_g = imagecolorallocate ( $image,0,128, 128 ); // $color = array($color_b, $color_c, $color_d,$color_e); shuffle($color); $colorrnd=imagecolorallocate ( $image,mt_rand(0,255),mt_rand(0,255), mt_rand(0,255) ); for($i = 0; $i < 1000; $i ++) { //绘背景干扰点 //imagesetpixel ( $image, mt_rand ( 0, $imgW ), mt_rand ( 0, $imgH ), $colors[rand(0,count($colors)-1)]); } imagerectangle ( $image, 0, 0, $imgW - 1, $imgH - 1, $color_b );//绘制边框 $str1=substr($randStr,0,1); $str2=substr($randStr,1,1); $str3=substr($randStr,2,1); $str4=substr($randStr,3,1); $range=mt_rand(-20,20); //imagettftext ( $image, $fontSize, 5, 3, 25, $color_b, $fontName, $randStr);///将验证字符绘入图片 字符旋转 for($i=1;$i<=4;$i++) { $p=$i-1; $str=$randStr["$p"]; //imagettftext ( $image, mt_rand(17,20), mt_rand(-20,20), $i*12, mt_rand(20,25), $color[mt_rand(0,count($color)-1)], $fontName, $str);///将验证字符绘入图片 字符旋转 imagettftext ( $image, mt_rand(17,20), mt_rand(-20,20), $i*12, mt_rand(20,25), $color[$i-1], $fontName, $str);///将验证字符绘入图片 字符旋转 } //imagettftext ( $image, mt_rand(17,20), mt_rand(-20,20), mt_rand(2,5), mt_rand(20,25), $color_b, $fontName, $str1);///将验证字符绘入图片 字符旋转 //imagettftext ( $image, mt_rand(17,20), mt_rand(-20,20), mt_rand(16,18), mt_rand(20,25), $color_c, $fontName, $str2);///将验证字符绘入图片 字符旋转 //imagettftext ( $image, mt_rand(17,20), mt_rand(-20,20), mt_rand(28,30), mt_rand(20,25), $color_d, $fontName, $str3);///将验证字符绘入图片 字符旋转 //imagettftext ( $image, mt_rand(17,20), mt_rand(-20,20), mt_rand(36,38), mt_rand(20,25), $color_e, $fontName, $str4);///将验证字符绘入图片 字符旋转 for($i=0; $i<4; $i++){ //绘背景干扰线 //imageline($image, mt_rand(0,5), mt_rand(6,18), mt_rand(65,$imgW), mt_rand(6,$imgH), $colorrnd);//一条干扰线 $h=30; $h1=rand(-5,5); $h2=rand(-1,1); $w2=rand(10,15); $h3=rand(4,6); $w=75; for($i=-$w/2;$i<$w/2;$i=$i+0.1) { $y=$h/$h3*sin($i/$w2)+$h/2+$h1; imagesetpixel($image,$i+$w/2,$y,$color[$p]); $h2!=0?imagesetpixel($image,$i+$w/2,$y+$h2,$color[$p]):null; } } imagepng ( $image ); imagedestroy ( $image ); } session_start (); $verifyCode = GetCode ( 4 ); $_SESSION ['VERIFY_CODE'] = $verifyCode ; createAuthNumImg ( $verifyCode, "font.ttf", 75, 30); //字体存放路径,如果你没有文件就去C:\WINDOWS\Fonts文件中找一个吧。 /** 问答模式 $a=GetCode(2,1); $b=GetCode(1,1); $passPort = $a."+".$b."=?"; $verifyCode = $a+$b; $_SESSION ['VERIFY_CODE'] = $verifyCode ; createAuthNumImg ( $passPort, "font.ttf", 75, 30); */ ?>