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<?php
/**
 *帶文字旋轉(zhuǎn)，傾斜，黏貼，加正弦干擾線驗(yàn)證碼*
 */
class Utils_Caption
{
	var $Width   = 60;      //圖片寬
	var $Height   = 30;      //圖片高
	var $Length   = 4;      //驗(yàn)證碼位數(shù)
	var $BgColor  = "#FFFFFF";  //背景色
	var $TFonts = array("font.ttf");
	var $TFontSize=array(17,20); //字體大小范圍
	var $TFontAngle=array(-20,20); //旋轉(zhuǎn)角度
	var $Chars  = "0123456789";     //驗(yàn)證碼范圍（字母數(shù)字）
	var $Code  = array();       //驗(yàn)證碼
	var $Image  = "";       //圖形對(duì)象
	var $FontColors=array(&#39;#f36161&#39;,&#39;#6bc146&#39;,&#39;#5368bd&#39;); //字體顏色,紅綠藍(lán)
	var $TPadden = 0.75;///字符間距,多少個(gè)字符
	var $Txbase = 5;///x軸兩邊距離
	var $Tybase =5 ;///y軸兩邊距離
	var $TLine =true; ///畫干擾線
	public function RandRSI() ///生成驗(yàn)證碼
	{
		$this->TFontAngle=range($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;?//?角度范圍
		$fontsizelen=count($TFontSize)-1;?//?角度范圍
		$fontcolorlen=count($FontColors)-1;?//?角度范圍
		for($i=0;$i<$this->Length;$i++)?///得到字符與顏色
		{
			$char=$Chars[rand(0,$charlen)];?///得到字符
			$angle=$TFontAngle[rand(0,$anglelen)];?///旋轉(zhuǎn)角度
			$fontsize=$TFontSize[rand(0,$fontsizelen)];?///字體大小
			$fontcolor=$FontColors[rand(0,$fontcolorlen)];?///字體大小
			$bound=$this->_calculateTextBox($fontsize,$angle,$font,$char);?///得到范圍
			$arr[]=array($fontsize,$angle,$fontcolor,$char,$font,$bound);?///得到矩形框
			$code.=$char;
		}
		$this->Code=$arr;?//驗(yàn)證碼
		return?$code;
	}
	public?function?Draw()?///畫圖
	{
		if(empty($this->Code))?$this->RandRSI();
		$codes=$this->Code;?///用戶驗(yàn)證碼
		$wh=$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));?///背景顏色
		imageFilledRectangle($image,?0,?0,?$width,?$height,?$back);?///填充背景
		$TPadden=$this->TPadden;
		$basex=$this->Txbase;
		$color=null;
		foreach?($codes?as?$v)?///逐個(gè)畫字符
		{
			$bound=$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'];///計(jì)算下一個(gè)左邊距
		}
		$this->TLine?$this->_wirteSinLine($color,$basex):null;?///畫干擾線
		header("Content-type:?image/png");
		imagepng(?$image);
		imagedestroy($image);
	}
	/**
	?*通過(guò)字體角度得到字體矩形寬度*
	?*
	?*?@param?int?$font_size?字體尺寸
	?*?@param?float?$font_angle?旋轉(zhuǎn)角度
	?*?@param?string?$font_file?字體文件路徑
	?*?@param?string?$text?寫入字符
	?*?@return?array?返回長(zhǎng)寬高
	?*/
	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,$this->Height));
	}
	//畫正弦干擾線
	private?function?_wirteSinLine($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;
		}
	}
}

DEMO ??:

$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();

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