class circleSeal {
private $sealString; //印章字符
private $strMaxLeng; //最大字符长度
private $sealRadius; //印章半径
private $rimWidth; //边框厚度
private $innerRadius; //内圆半径
private $startRadius; //五角星半径
private $startAngle; //五角星倾斜角度
private $backGround; //印章颜色
private $centerDot; //圆心坐标
private $img; //图形资源句柄
private $font; //指定的字体
private $fontSize; //指定字体大小
private $width; //图片宽度
private $height; //图片高度
private $points; //五角星各点坐标
private $charRadius; //字符串半径
private $charAngle; //字符串倾斜角度
private $spacing; //字符间隔角度

//构造方法
public function construct($str ='',$rad = 75,$rmwidth = 6,$strad = 24,$stang = 0,$crang = 0,$fsize = 16,$inrad =0){
$this->sealString = empty($str) ? '印章测试字符串' : $str;
$this->strMaxLeng = 12;
$this->sealRadius = $rad;
$this->rimWidth = $rmwidth;
$this->startRadius = $strad;
$this->startAngle = $stang;
$this->charAngle = $crang;
$this->centerDot = array('x'=>$rad,'y'=>$rad);
$this->font = dirname(FILE__) .'/simkai.ttf';
$this->fontSize = $fsize;
$this->innerRadius = $inrad; //默认0,没有
$this->spacing = 1;
}

//创建图片资源
private function createImg(){
$this->width = 2 $this->sealRadius;
$this->height = 2 $this->sealRadius;
$this->img = imagecreate($this->width,$this->height);
imagecolorresolvealpha($this->img,255,127);
$this->backGround = imagecolorallocate($this->img,0);
}

//画印章边框
private function drawRim(){
for($i=0;$i<$this->rimWidth;$i++){
imagearc($this->img,$this->centerDot['x'],$this->centerDot['y'],$this->width - $i,$this->height - $i,360,$this->backGround);
}
}

//画内圆
private function drawInnerCircle(){
imagearc($this->img,2*$this->innerRadius,$this->backGround);
}

//画字符串
private function drawString(){
//编码处理
$charset = mb_detect_encoding($this->sealString);
if($charset != 'UTF-8'){
$this->sealString = mb_convert_encoding($this->sealString,'UTF-8','GBK');
}

//相关计量
$this->charRadius = $this->sealRadius - $this->rimWidth - $this->fontSize; //字符串半径
$leng  = mb_strlen($this->sealString,'utf8'); //字符串长度
if($leng > $this->strMaxLeng) $leng = $this->strMaxLeng;
$avgAngle  = 360 / ($this->strMaxLeng);  //平均字符倾斜度

//拆分并写入字符串
$words = array(); //字符数组
for($i=0;$i<$leng;$i++){
  $words[] = mb_substr($this->sealString,$i,1,'utf8');
  $r = 630 + $this->charAngle + $avgAngle*($i - $leng/2) + $this->spacing*($i-1);   //坐标角度
  $R = 720 - $this->charAngle + $avgAngle*($leng-2*$i-1)/2 + $this->spacing*(1-$i);  //字符角度
  $x = $this->centerDot['x'] + $this->charRadius * cos(deg2rad($r)); //字符的x坐标
  $y = $this->centerDot['y'] + $this->charRadius * sin(deg2rad($r)); //字符的y坐标
  imagettftext($this->img,$this->fontSize,$R,$x,$y,$this->backGround,$this->font,$words[$i]);
}

}

//画五角星
private function drawStart(){
$ang_out = 18 + $this->startAngle;
$ang_in = 56 + $this->startAngle;
$rad_out = $this->startRadius;
$rad_in = $rad_out 0.382;
for($i=0;$i<5;$i++){
//五个顶点坐标
$this->points[] = $rad_out cos(2M_PI/5$i - deg2rad($ang_out)) + $this->centerDot['x'];
$this->points[] = $rad_out sin(2M_PI/5*$i - deg2rad($ang_out)) + $this->centerDot['y'];

  //内凹的点坐标
  $this->points[] = $rad_in * cos(2*M_PI/5*($i+1) - deg2rad($ang_in)) + $this->centerDot['x'];
  $this->points[] = $rad_in * sin(2*M_PI/5*($i+1) - deg2rad($ang_in)) + $this->centerDot['y'];
}
imagefilledpolygon($this->img,$this->points,10,$this->backGround);

}

//输出
private function outPut(){
header('Content-type:image/png');
imagepng($this->img);
imagedestroy($this->img);
}

//对外生成
public function doImg(){
$this->createImg();
$this->drawRim();
$this->drawInnerCircle();
$this->drawString();
$this->drawStart();
$this->outPut();
}
}

方法二：

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