方法一：
doimg(); */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,255,255,255,127);$this->background = imagecolorallocate($this->img,255,0,0); }//画印章边框 private function drawrim(){for($i=0;$irimwidth;$i++){imagearc($this->img,$this->centerdot['x'],$this->centerdot['y'],$this->width - $i,$this->height - $i,0,360,$this->background);} }//画内圆 private function drawinnercircle(){imagearc($this->img,$this->centerdot['x'],$this->centerdot['y'],2*$this->innerradius,2*$this->innerradius,0,360,$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($i=0;$isealstring,$i,1,'utf8');$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;$ipoints[] = $rad_out * cos(2*m_pi/5*$i - deg2rad($ang_out)) + $this->centerdot['x'];$this->points[] = $rad_out * sin(2*m_pi/5*$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：
$max)$count=$max;if($count>12)$m=floor(360/$count);else if($count>5)$m-=$count;for($i=0;$i=0;$i--) { $arc=$m*($j-$i)+$size/2; $x=round($r*cos((90+$arc)*m_pi/180))+$a; $y=-1*(round($r*sin((90+$arc)*m_pi/180))+$b); if($arc=0;$i--) { $arc=$m/2+$m*($j-$i)+$size/2; $x=round($r*cos((90+$arc)*m_pi/180))+$a; $y=-1*(round($r*sin((90+$arc)*m_pi/180))+$b); imagettftext($im,$size,$arc,$x,$y,$red,$stock,$word[$i]); $arc=$m/2+$m*($j-$i)-$size/2; $x=round($r*cos((90-$arc)*m_pi/180))+$a; $y=-1*(round($r*sin((90-$arc)*m_pi/180))+$b); imagettftext($im,$size,-$arc,$x,$y,$red,$stock,$word[$j+$j+1-$i]); }}header('content-type:image/png');imagepng($im);?>
以上所述就是本文的全部内容了，，希望大家能够喜欢