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

<?php<br />
function getAuthImage($text) {<br />
	$im_x = 160;<br />
	$im_y = 40;<br />
	$im = imagecreatetruecolor($im_x,$im_y);<br />
	$text_c = ImageColorAllocate($im, mt_rand(0,100),mt_rand(0,100),mt_rand(0,100));<br />
	$tmpC0=mt_rand(100,255);<br />
	$tmpC1=mt_rand(100,255);<br />
	$tmpC2=mt_rand(100,255);<br />
	$buttum_c = ImageColorAllocate($im,$tmpC0,$tmpC1,$tmpC2);<br />
	imagefill($im, 16, 13, $buttum_c);<br />
<br />
	$font = 't1.ttf';<br />
<br />
	for ($i=0;$i<strlen($text);$i++)<br />
	{<br />
		$tmp =substr($text,$i,1);<br />
		$array = array(-1,1);<br />
		$p = array_rand($array);<br />
		$an = $array[$p]*mt_rand(1,10);//角度<br />
		$size = 28;<br />
		imagettftext($im, $size, $an, 15+$i*$size, 35, $text_c, $font, $tmp);<br />
	}<br />
<br />
<br />
	$distortion_im = imagecreatetruecolor ($im_x, $im_y);<br />
<br />
	imagefill($distortion_im, 16, 13, $buttum_c);<br />
	for ( $i=0; $i<$im_x; $i++) {<br />
		for ( $j=0; $j<$im_y; $j++) {<br />
			$rgb = imagecolorat($im, $i , $j);<br />
			if( (int)($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 ) {<br />
				imagesetpixel ($distortion_im, (int)($i+10+sin($j/$im_y*2*M_PI-M_PI*0.1)*4) , $j , $rgb);<br />
			}<br />
		}<br />
	}<br />
	//加入干扰象素;<br />
	$count = 160;//干扰像素的数量<br />
	for($i=0; $i<$count; $i++){<br />
		$randcolor = ImageColorallocate($distortion_im,mt_rand(0,255),mt_rand(0,255),mt_rand(0,255));<br />
		imagesetpixel($distortion_im, mt_rand()%$im_x , mt_rand()%$im_y , $randcolor);<br />
	}<br />
<br />
	$rand = mt_rand(5,30);<br />
	$rand1 = mt_rand(15,25);<br />
	$rand2 = mt_rand(5,10);<br />
	for ($yy=$rand; $yy<=+$rand+2; $yy++){<br />
		for ($px=-80;$px<=80;$px=$px+0.1)<br />
		{<br />
			$x=$px/$rand1;<br />
			if ($x!=0)<br />
			{<br />
				$y=sin($x);<br />
			}<br />
			$py=$y*$rand2;<br />
<br />
			imagesetpixel($distortion_im, $px+80, $py+$yy, $text_c);<br />
		}<br />
	}<br />
<br />
	//设置文件头;<br />
	Header("Content-type: image/JPEG");<br />
<br />
	//以PNG格式将图像输出到浏览器或文件;<br />
	ImagePNG($distortion_im);<br />
<br />
	//销毁一图像,释放与image关联的内存;<br />
	ImageDestroy($distortion_im);<br />
	ImageDestroy($im);<br />
}<br />
<br />
function make_rand($length="32"){//验证码文字生成函数<br />
	$str="ABCDEFGHIJKLMNOPQRSTUVWXYZ";<br />
	$result="";<br />
	for($i=0;$i<$length;$i++){<br />
		$num[$i]=rand(0,25);<br />
		$result.=$str[$num[$i]];<br />
	}<br />
	return $result;<br />
}<br />
<br />
<br />
//输出调用<br />
$checkcode = make_rand(4);<br />
session_start();//将随机数存入session中<br />
$_SESSION['helloweba_gg']=strtolower($checkcode);<br />
getAuthImage($checkcode);<br />
?><br />

Copier après la connexion

windows的服务器可以. 就是ubuntu 不行