php生成复杂验证码(倾斜，正弦干扰线，黏贴，旋转)

<?php/** *带文字旋转，倾斜，黏贴，加正弦干扰线验证码* */class Utils_Caption{	var $Width   = 60;      //图片宽	var $Height   = 30;      //图片高	var $Length   = 4;      //验证码位数	var $BgColor  = "#FFFFFF";  //背景色	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->_calculateTextBox($fontsize,$angle,$font,$char); ///得到范围			$arr[]=array($fontsize,$angle,$fontcolor,$char,$font,$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; ///用户验证码		$wh=$this->_getImageWH($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, 0, 0, $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'];///计算下一个左边距		}		$this->TLine?$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*	 *	 * @param int $font_size 字体尺寸	 * @param float $font_angle 旋转角度	 * @param string $font_file 字体文件路径	 * @param string $text 写入字符	 * @return array 返回长宽高	 */	private function _calculateTextBox($font_size, $font_angle, $font_file, $text) {		$box = imagettfbbox($font_size, $font_angle, $font_file, $text);		$min_x = min(array($box[0], $box[2], $box[4], $box[6]));		$max_x = max(array($box[0], $box[2], $box[4], $box[6]));		$min_y = min(array($box[1], $box[3], $box[5], $box[7]));		$max_y = max(array($box[1], $box[3], $box[5], $box[7]));		return array(		'left' => ($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,		'box' => $box		);	}	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], $color[2]);	}	private function _getImageWH($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+$h1;			imagesetpixel($img,$i+$w/2,$y,$color);			$h2!=0?imagesetpixel($img,$i+$w/2,$y+$h2,$color):null;		}	}}

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