php基于GD库画五星红旗的方法

<?php
header("Content-Type:image/jpeg");
$ing = imagecreatetruecolor(700,410);
//新建一个真彩色图像,返回值为一个图像标识符,背景默认为黑色,参数(x_size*y_size)
$red = imagecolorallocate($ing,255,0);//定义背景颜色
$yellow = imagecolorallocate($ing,237,231,32);//定义黄色
imagefill($ing,$red);//填充颜色,以坐标(0,0)开始起填充
//数组坐标,表示(x1,y1,x2,y2,x3,y3.....x11,y11);
$a = array(90,30,108,73,157,119,102,135,152,93,123,52,66,29,74,76,90,30);
imagefilledpolygon($ing,$a,10,$yellow);//画一个多边形：10表示顶点总数,$yellow表示填充色
$a1 = array(229,25,229,43,248,48,55,217,60,198,210,50,197,34,218,39,25);
imagefilledpolygon($ing,$a1,$yellow);
$a2 = array(227,227,127,245,134,228,139,215,143,196,149,208,132,117,122,108);
imagefilledpolygon($ing,$a2,$yellow);
$a3 = array(163,184,163,204,181,211,216,234,220,225,144,209,193,151,199,184);
imagefilledpolygon($ing,$a3,$yellow);
$a4 = array(65,65,84,235,240,259,54,33,249,46,233,53,224,68,209);
imagefilledpolygon($ing,$a4,$yellow);
ob_clean();
imagejpeg($ing);
imagedestroy($ing);
?>