ubuntu的PHP服务器,验证码图片不显示字符,咋回事

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代码贴出来看一下

function getAuthImage($text) {

	$im_x = 160;

	$im_y = 40;

	$im = imagecreatetruecolor($im_x,$im_y);

	$text_c = ImageColorAllocate($im, mt_rand(0,100),mt_rand(0,100),mt_rand(0,100));

	$tmpC0=mt_rand(100,255);

	$tmpC1=mt_rand(100,255);

	$tmpC2=mt_rand(100,255);

	$buttum_c = ImageColorAllocate($im,$tmpC0,$tmpC1,$tmpC2);

	imagefill($im, 16, 13, $buttum_c);



	$font = 't1.ttf';



	for ($i=0;$i
	{

		$tmp =substr($text,$i,1);

		$array = array(-1,1);

		$p = array_rand($array);

		$an = $array[$p]*mt_rand(1,10);//角度

		$size = 28;

		imagettftext($im, $size, $an, 15+$i*$size, 35, $text_c, $font, $tmp);

	}





	$distortion_im = imagecreatetruecolor ($im_x, $im_y);



	imagefill($distortion_im, 16, 13, $buttum_c);

	for ( $i=0; $i<$im_x; $i++) {

		for ( $j=0; $j<$im_y; $j++) {

			$rgb = imagecolorat($im, $i , $j);

			if( (int)($i+20+sin($j/$im_y*2*M_PI)*10) <= imagesx($distortion_im)&& (int)($i+20+sin($j/$im_y*2*M_PI)*10) >=0 ) {

				imagesetpixel ($distortion_im, (int)($i+10+sin($j/$im_y*2*M_PI-M_PI*0.1)*4) , $j , $rgb);

			}

		}

	}

	//加入干扰象素;

	$count = 160;//干扰像素的数量

	for($i=0; $i<$count; $i++){

		$randcolor = ImageColorallocate($distortion_im,mt_rand(0,255),mt_rand(0,255),mt_rand(0,255));

		imagesetpixel($distortion_im, mt_rand()%$im_x , mt_rand()%$im_y , $randcolor);

	}



	$rand = mt_rand(5,30);

	$rand1 = mt_rand(15,25);

	$rand2 = mt_rand(5,10);

	for ($yy=$rand; $yy<=+$rand+2; $yy++){

		for ($px=-80;$px<=80;$px=$px+0.1)

		{

			$x=$px/$rand1;

			if ($x!=0)

			{

				$y=sin($x);

			}

			$py=$y*$rand2;



			imagesetpixel($distortion_im, $px+80, $py+$yy, $text_c);

		}

	}



	//设置文件头;

	Header("Content-type: image/JPEG");



	//以PNG格式将图像

输出到浏览器或文件;
ImagePNG($distortion_im);

//销毁一图像,释放与image关联的内存;
ImageDestroy($distortion_im);
ImageDestroy($im);
}

function make_rand($length="32"){//验证码文字生成函数
$str="ABCDEFGHIJKLMNOPQRSTUVWXYZ";
$result="";
for($i=0;$i<$length;$i++){
$num[$i]=rand(0,25);
$result.=$str[$num[$i]];
}
return $result;
}


//输出调用
$checkcode = make_rand(4);
session_start();//将随机数存入session中
$_SESSION['helloweba_gg']=strtolower($checkcode);
getAuthImage($checkcode);
?>





windows的服务器可以. 就是ubuntu 不行