php生成复杂验证码(倾斜，正弦干扰线，黏贴，旋转)

现在好多网站使用的验证码非常容易被软件自动识别到，本文介绍了一种PHP生成复杂验证码加入倾斜,弦干扰线,黏贴,旋转等效果

常见的软件不容易自动识别的验证码做法有以下3种：

1、字体变型 （一般通过算法，进行扭曲）

2、字体黏贴 （这里面以qq验证码为代表了，目前网上还是很难找到，破解qq验证码的)

3、干扰线，噪点 (这种识别起来相当容易，很容易被程序自动化识别）

对于上面提到，第1,2 二种方法，在识别时候，是比较困难的。

具体实现代码：

rush:PHP;"> var $TFonts = array("font.ttf"); var $TFontSize=array(17,20); //字体大小范围 var $TFontAngle=array(-20,20); //旋转角度 var $Chars = "0123456789"; //验证码范围（字母数字） var $Code = array(); //验证码 var $Image = ""; //图形对象 var $FontColors=array('#f36161','#6bc146','#5368bd'); //字体颜色,红绿蓝 var $TPadden = 0.75;///字符间距,多少个字符 var $Txbase = 5;///x轴两边距离 var $Tybase =5 ;///y轴两边距离 var $TLine =true; ///画干扰线 public function RandRSI() ///生成验证码 { $this->TFontAngle=range($this->TFontAngle[0],$this->TFontAngle[1]); $this->TFontSize=range($this->TFontSize[0],$this->TFontSize[1]); $arr=array(); $Chars=$this->Chars; $TFontAngle=$this->TFontAngle; $TFontSize=$this->TFontSize; $FontColors=$this->FontColors; $code=""; $font=dirname(__FILE__)."/font/".$this->TFonts[0]; $charlen=strlen($Chars)-1; $anglelen=count($TFontAngle)-1; // 角度范围 $fontsizelen=count($TFontSize)-1; // 角度范围 $fontcolorlen=count($FontColors)-1; // 角度范围 for($i=0;$i<$this->Length;$i++) ///得到字符与颜色 { $char=$Chars[rand(0,$charlen)]; ///得到字符 $angle=$TFontAngle[rand(0,$anglelen)]; ///旋转角度 $fontsize=$TFontSize[rand(0,$fontsizelen)]; ///字体大小 $fontcolor=$FontColors[rand(0,$fontcolorlen)]; ///字体大小 $bound=$this->_cal<a href="https://www.jb51.cc/tag/cula/" target="_blank" class="keywords">cula</a>teText<a href="https://www.jb51.cc/tag/Box/" target="_blank" class="keywords">Box</a>($fontsize,$angle,$font,$char); ///得到范围 $arr[]=array($fontsize,$fontcolor,$char,$bound); ///得到矩形框 $code.=$char; } $this->Code=$arr; //验证码 return $code; } public function Draw() ///画图 { if(empty($this->Code)) $this->RandRSI(); $codes=$this->Code; ///<a href="https://www.jb51.cc/tag/yonghu/" target="_blank" class="keywords">用户</a>验证码 $wh=$this->_ge<a href="https://www.jb51.cc/tag/timage/" target="_blank" class="keywords">timage</a>WH($codes); $width=$wh[0]; $height=$wh[1]; ///高度 $this->Width=$width; $this->Height=$height; $this->Image = imageCreate( $width,$height ); $image=$this->Image; $back = $this->_getColor2($this->_getColor( $this->BgColor)); ///背景颜色 imageFilledRectangle($image,$width,$height,$back); ///填充背景 $TPadden=$this->TPadden; $basex=$this->Txbase; $color=null; foreach ($codes as $v) ///逐个画字符 { $bound=$v[5]; $color=$this->_getColor2($this->_getColor($v[2])); imagettftext($image,$v[0],$v[1],$basex,$bound['height'],$color,$v[4],$v[3]); $basex=$basex+$bound['width']*$TPadden-$bound['left'];///计算下<a href="https://www.jb51.cc/tag/yige/" target="_blank" class="keywords">一个</a>左边距 } $this->TLine?$this->_wirteSinLine($color,$basex):null; ///画干扰线 header("Content-type: image/png"); imagepng( $image); imagedestroy($image); } /** *通过字体角度得到字体矩形宽度* * * @p<a href="https://www.jb51.cc/tag/ara/" target="_blank" class="keywords">ara</a>m int $font_size 字体尺寸 * @p<a href="https://www.jb51.cc/tag/ara/" target="_blank" class="keywords">ara</a>m float $font_angle 旋转角度 * @p<a href="https://www.jb51.cc/tag/ara/" target="_blank" class="keywords">ara</a>m string $font_file 字体<a href="https://www.jb51.cc/tag/wenjian/" target="_blank" class="keywords">文件</a>路径 * @p<a href="https://www.jb51.cc/tag/ara/" target="_blank" class="keywords">ara</a>m string $text 写入字符 * @return array 返回长宽高 */ private function _cal<a href="https://www.jb51.cc/tag/cula/" target="_blank" class="keywords">cula</a>teText<a href="https://www.jb51.cc/tag/Box/" target="_blank" class="keywords">Box</a>($font_size,$font_angle,$font_file,$text) { $<a href="https://www.jb51.cc/tag/Box/" target="_blank" class="keywords">Box</a> = imagettfb<a href="https://www.jb51.cc/tag/Box/" target="_blank" class="keywords">Box</a>($font_size,$text); $min_x = min(array($<a href="https://www.jb51.cc/tag/Box/" target="_blank" class="keywords">Box</a>[0],$<a href="https://www.jb51.cc/tag/Box/" target="_blank" class="keywords">Box</a>[2],$<a href="https://www.jb51.cc/tag/Box/" target="_blank" class="keywords">Box</a>[4],$<a href="https://www.jb51.cc/tag/Box/" target="_blank" class="keywords">Box</a>[6])); $max_x = max(array($<a href="https://www.jb51.cc/tag/Box/" target="_blank" class="keywords">Box</a>[0],$<a href="https://www.jb51.cc/tag/Box/" target="_blank" class="keywords">Box</a>[6])); $min_y = min(array($<a href="https://www.jb51.cc/tag/Box/" target="_blank" class="keywords">Box</a>[1],$<a href="https://www.jb51.cc/tag/Box/" target="_blank" class="keywords">Box</a>[3],$<a href="https://www.jb51.cc/tag/Box/" target="_blank" class="keywords">Box</a>[5],$<a href="https://www.jb51.cc/tag/Box/" target="_blank" class="keywords">Box</a>[7])); $max_y = max(array($<a href="https://www.jb51.cc/tag/Box/" target="_blank" class="keywords">Box</a>[1],$<a href="https://www.jb51.cc/tag/Box/" target="_blank" class="keywords">Box</a>[7])); return array( 'left' => ($min_x >= -1) ? -abs($min_x + 1) : abs($min_x + 2),'top' => abs($min_y),'width' => $max_x - $min_x,'height' => $max_y - $min_y,'<a href="https://www.jb51.cc/tag/Box/" target="_blank" class="keywords">Box</a>' => $<a href="https://www.jb51.cc/tag/Box/" target="_blank" class="keywords">Box</a> ); } private function _getColor( $color ) //#ffffff { return array(hexdec($color[1].$color[2]),hexdec($color[3].$color[4]),hexdec($color[5].$color[6])); } private function _getColor2( $color ) //#ffffff { return imagecolorallocate ($this->Image,$color[0],$color[1],$color[2]); } private function _ge<a href="https://www.jb51.cc/tag/timage/" target="_blank" class="keywords">timage</a>WH($data) { $TPadden=$this->TPadden; $w=$this->Txbase; $h=0; foreach ($data as $v) { $w=$w+$v[5]['width']*$TPadden-$v[5]['left']; $h=$h>$v[5]['height']?$h:$v[5]['height']; } return array(max($w,$this->Width),max($h,$this->Height)); } //画正弦干扰线 private function _wirteSinLine($color,$w) { $img=$this->Image; $h=$this->Height; $h1=rand(-5,5); $h2=rand(-1,1); $w2=rand(10,15); $h3=rand(4,6); for($i=-$w/2;$i<$w/2;$i=$i+0.1) { $y=$h/$h3*sin($i/$w2)+$h/2+$h1; <a href="https://www.jb51.cc/tag/imageset/" target="_blank" class="keywords">imageset</a>pixel($img,$i+$w/2,$y,$color); $h2!=0?<a href="https://www.jb51.cc/tag/imageset/" target="_blank" class="keywords">imageset</a>pixel($img,$y+$h2,$color):null; } }

}

DEMO代码：

TFontSize=array(15,17); $rsi->Width=50; $rsi->Height=25; $code = $rsi->RandRSI(); session_start(); $_SESSION["CHECKCODE"] = $code; $rsi->Draw();

运行效果：

大家可以修改代码中的相应数值达到自己需要的复杂度