增强验证码识别难度

src/plus/vdimgck.php

@@ -1,4 +1,5 @@
 <?php
+
 /**
  * 验证图片
  *
@@ -8,35 +9,37 @@
  * @license        http://help.dedecms.com/usersguide/license.html
  * @link           http://www.dedecms.com
  */
-require_once (dirname(__FILE__).'/../include/common.inc.php');
-require_once (DEDEDATA.'/safe/inc_safe_config.php');
-require_once (DEDEDATA.'/config.cache.inc.php');
+require_once(dirname(__FILE__) . '/../include/common.inc.php');
+require_once(DEDEDATA . '/safe/inc_safe_config.php');
+require_once(DEDEDATA . '/config.cache.inc.php');
 $config = array(
-    'font_size'   => 14,
+    'font_size'   => 20,
     'img_height'  => $safe_wheight,
-    'word_type'  => (int)$safe_codetype,   // 1:数字  2:英文   3:单词
+    'word_type'  => (int)$safe_codetype,   // 1:数字 2:英文  3:单词
     'img_width'   => $safe_wwidth,
     'use_boder'   => TRUE,
-    'font_file'   => DEDEINC.'/data/fonts/'.mt_rand(1,3).'.ttf',
-    'wordlist_file'   => DEDEINC.'/data/words/words.txt',
-    'filter_type' => 5);
+    'font_file'   => DEDEINC . '/data/fonts/' . mt_rand(1, 6) . '.ttf',
+    'wordlist_file'   => DEDEINC . '/data/words/words.txt',
+    'filter_type' => 5
+);
 
-$enkey = substr(md5(substr($cfg_cookie_encode,0,5)),0,10);
-$sessSavePath = DEDEDATA."/sessions_{$enkey}";
-if ( !is_dir($sessSavePath) ) mkdir($sessSavePath);
+$enkey = substr(md5(substr($cfg_cookie_encode, 0, 5)), 0, 10);
+$sessSavePath = DEDEDATA . "/sessions_{$enkey}";
+if (!is_dir($sessSavePath)) mkdir($sessSavePath);
 
 // Session保存路径
 
-if(is_writeable($sessSavePath) && is_readable($sessSavePath)){ session_save_path($sessSavePath); }
-if(!empty($cfg_domain_cookie)) session_set_cookie_params(0,'/',$cfg_domain_cookie);
+if (is_writeable($sessSavePath) && is_readable($sessSavePath)) {
+    session_save_path($sessSavePath);
+}
+if (!empty($cfg_domain_cookie)) session_set_cookie_params(0, '/', $cfg_domain_cookie);
 
-if (!echo_validate_image($config))
-{
+if (!echo_validate_image($config)) {
     // 如果不成功则初始化一个默认验证码
     @session_start();
     $_SESSION['securimage_code_value'] = strtolower('abcd');
     if (function_exists('imagecreatefromjpeg')) {
-        $im = @imagecreatefromjpeg(DEDEINC.'/data/vdcode.jpg');
+        $im = @imagecreatefromjpeg(DEDEINC . '/data/vdcode.jpg');
         header("Pragma:no-cache\r\n");
         header("Cache-Control:no-cache\r\n");
         header("Expires:0\r\n");
@@ -46,34 +49,34 @@ if (!echo_validate_image($config))
         header("Pragma:no-cache\r\n");
         header("Cache-Control:no-cache\r\n");
         header("Expires:0\r\n");
-        $c = file_get_contents(DEDEINC.'/data/vdcode.jpg',true);
-        $size = filesize(DEDEINC.'/data/vdcode.jpg');
-        header ('Content-Type: image/x-icon');
-        header ("Content-length: $size");
+        $c = file_get_contents(DEDEINC . '/data/vdcode.jpg', true);
+        $size = filesize(DEDEINC . '/data/vdcode.jpg');
+        header('Content-Type: image/x-icon');
+        header("Content-length: $size");
         echo $c;
     }
 }
 
-function echo_validate_image( $config = array() )
+function echo_validate_image($config = array())
 {
     @session_start();
 
-    if ( !function_exists('imagettftext') )
-    {
+    if (!function_exists('imagettftext')) {
         return false;
     }
 
     //主要参数
     $font_size   = isset($config['font_size']) ? $config['font_size'] : 14;
-    $img_height  = isset($config['img_height']) ? $config['img_height'] : 24;
+    $img_height  = isset($config['img_height']) ? $config['img_height'] : 38;
     $img_width   = isset($config['img_width']) ? $config['img_width'] : 68;
-    $font_file   = isset($config['font_file']) ? $config['font_file'] : DEDEINC.'/data/font/'.mt_rand(1,3).'.ttf';
+    $font_file   = isset($config['font_file']) ? $config['font_file'] : DEDEINC . '/data/font/' . mt_rand(1, 6) . '.ttf';
     $use_boder   = isset($config['use_boder']) ? $config['use_boder'] : TRUE;
     $filter_type = isset($config['filter_type']) ? $config['filter_type'] : 0;
 
     //创建图片，并设置背景色
     $im = @imagecreate($img_width, $img_height);
-    imagecolorallocate($im, 255,255,255);
+
+    imagecolorallocate($im, mt_rand(200, 255), mt_rand(200, 255), mt_rand(200, 255));
 
     //文字随机颜色
     $fontColor[]  = imagecolorallocate($im, 0x15, 0x15, 0x15);
@@ -84,27 +87,23 @@ function echo_validate_image( $config = array() )
 
     //获取随机字符
     $rndstring  = '';
-    if ($config['word_type'] != 3)
-    {
-        for($i=0; $i<4; $i++)
-        {
-            if ($config['word_type'] == 1)
-            {
+    if ($config['word_type'] != 3) {
+        for ($i = 0; $i < 4; $i++) {
+            if ($config['word_type'] == 1) {
                 $c = chr(mt_rand(48, 57));
-            } else if($config['word_type'] == 2)
-            {
+            } else if ($config['word_type'] == 2) {
                 $c = chr(mt_rand(65, 90));
-                if( $c=='I' ) $c = 'P';
-                if( $c=='O' ) $c = 'N';
+                if ($c == 'I') $c = 'P';
+                if ($c == 'O') $c = 'N';
             }
             $rndstring .= $c;
         }
     } else {
-        $chars='abcdefghigklmnopqrstuvwxwyABCDEFGHIGKLMNOPQRSTUVWXWY0123456789';
-        $rndstring='';
-        $length = rand(4,4);
+        $chars = 'abcdefghigklmnopqrstuvwxwyABCDEFGHIGKLMNOPQRSTUVWXWY0123456789';
+        $rndstring = '';
+        $length = rand(4, 4);
         $max = strlen($chars) - 1;
-        for($i = 0; $i < $length; $i++) {
+        for ($i = 0; $i < $length; $i++) {
             $rndstring .= $chars[mt_rand(0, $max)];
         }
     }
@@ -113,51 +112,67 @@ function echo_validate_image( $config = array() )
 
     $rndcodelen = strlen($rndstring);
 
-    //背景横线
-    $lineColor1 = imagecolorallocate($im, 0xda, 0xd9, 0xd1);
-    for($j=3; $j<=$img_height-3; $j=$j+3)
-    {
-        imageline($im, 2, $j, $img_width - 2, $j, $lineColor1);
+    // //背景横线
+    // $lineColor1 = imagecolorallocate($im, 0xda, 0xd9, 0xd1);
+    // for ($j = 3; $j <= $img_height - 3; $j = $j + 3) {
+    //     imageline($im, 2, $j, $img_width - 2, $j, $lineColor1);
+    // }
+
+    // //背景竖线
+    // $lineColor2 = imagecolorallocate($im, 0xda, 0xd9, 0xd1);
+    // for ($j = 2; $j < 100; $j = $j + 6) {
+    //     imageline($im, $j, 0, $j + 8, $img_height, $lineColor2);
+    // }
+
+    // 增加一些噪线
+    for ($i=0; $i < 5; $i++) { 
+        $red = mt_rand(50, 255);
+        $green = mt_rand(50, 255);
+        $blue = mt_rand(50, 255);
+        $tcol = imagecolorallocate($im, $red, $green, $blue);
+        if (mt_rand(0, 1)) { // Horizontal
+            $Xa   = mt_rand(0, $img_width/2);
+            $Ya   = mt_rand(0, $img_height);
+            $Xb   = mt_rand($img_width/2, $img_width);
+            $Yb   = mt_rand(0, $img_height);
+        } else { // Vertical
+            $Xa   = mt_rand(0, $img_width);
+            $Ya   = mt_rand(0, $img_height/2);
+            $Xb   = mt_rand(0, $img_width);
+            $Yb   = mt_rand($img_height/2, $img_height);
+        }
+        imagesetthickness($im, mt_rand(1, 3));
+        imageline($im, $Xa, $Ya, $Xb, $Yb, $tcol);
     }
 
-    //背景竖线
-    $lineColor2 = imagecolorallocate($im, 0xda,0xd9,0xd1);
-    for($j=2;$j<100;$j=$j+6)
-    {
-        imageline($im, $j, 0, $j+8, $img_height, $lineColor2);
-    }
 
     //画边框
-    if( $use_boder && $filter_type == 0 )
-    {
+    if ($use_boder && $filter_type == 0) {
         $bordercolor = imagecolorallocate($im, 0x9d, 0x9e, 0x96);
-        imagerectangle($im, 0, 0, $img_width-1, $img_height-1, $bordercolor);
+        imagerectangle($im, 0, 0, $img_width - 1, $img_height - 1, $bordercolor);
     }
 
     //输出文字
     $lastc = '';
-    for($i=0;$i<$rndcodelen;$i++)
-    {
-        $bc = mt_rand(0, 1);
+    for ($i = 0; $i < $rndcodelen; $i++) {
         $rndstring[$i] = strtoupper($rndstring[$i]);
-        $c_fontColor = $fontColor[mt_rand(0,4)];
-        $y_pos = $i==0 ? 4 : $i*($font_size+2);
-        $c = mt_rand(0, 15);
-        @imagettftext($im, $font_size, $c, $y_pos, 19, $c_fontColor, $font_file, $rndstring[$i]);
+        $c_fontColor = $fontColor[mt_rand(0, 4)];
+        $y_pos = $i == 0 ? 4 : $i * ($font_size + 2);
+        $c = mt_rand(10, 30);
+        @imagettftext($im, $font_size, $c, $y_pos, 28, $c_fontColor, $font_file, $rndstring[$i]);
         $lastc = $rndstring[$i];
     }
 
     //图象效果
-    switch($filter_type)
-    {
+    switch ($filter_type) {
         case 1:
-            imagefilter ( $im, IMG_FILTER_NEGATE);
+            imagefilter($im, IMG_FILTER_NEGATE);
             break;
         case 2:
-            imagefilter ( $im, IMG_FILTER_EMBOSS);
+            imagefilter($im, IMG_FILTER_EMBOSS);
             break;
         case 3:
-            imagefilter ( $im, IMG_FILTER_EDGEDETECT);
+            imagefilter($im, IMG_FILTER_EDGEDETECT);
             break;
         default:
             break;
@@ -170,13 +185,10 @@ function echo_validate_image( $config = array() )
     //输出特定类型的图片格式，优先级为 gif -> jpg ->png
     //dump(function_exists("imagejpeg"));
 
-    if(function_exists("imagejpeg"))
-    {
+    if (function_exists("imagejpeg")) {
         header("content-type:image/jpeg\r\n");
         imagejpeg($im);
-    }
-    else
-    {
+    } else {
         header("content-type:image/png\r\n");
         imagepng($im);
     }