Ubuntu PHP server, captcha picture does not display characters, what's the

Ubuntu PHP server, captcha picture does not show characters, what's going on
Ubuntu PHP server, captcha picture does not display characters, what's going on?
There is a picture generated, that is, no character display. Is the character set wrong? Where is the setting?

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------Solution--------------------
References:

Quote: References:

Code to check it out.

   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));
$tmpC 0=mt_rand (100,255);
$tmpC 1=mt_rand (100,255);
$tmpC 2=mt_rand (100,255);
$buttum _c = imagecolorallocate ($im, $tmpC 0, $tmpC 1, $tmpC 2);
Imagefill ($im, $buttum _c);

$font = ' T1.ttf ';

for ($i =0; $i
   
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   {
$tmp =substr ($text, $i, 1);
$array = Array ( -1,1);
$p = Array_rand ($array);
$an = $array [$p]*mt_rand (1,10);//Angle
$size = 28;
Imagettftext ($im, $size, $an, 15+ $i * $size, $text _c, $font, $tmp);
}


$distortion _im = Imagecreatetruecolor ($im _x, $im _y);

Imagefill ($distortion _im, $buttum _c);
for ($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) * ) >=0) {
Imagesetpixel ($distortion _im, (int) ($i +10+sin ($j/$im _y*2*m_pi-m_pi*0.1), $j, $rgb);
}
}
}
adding interfering pixels;
$count = number of 160;//interfering pixels
for ($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);
$rand 1 = mt_rand (15,25);
$rand 2 = Mt_rand (5,10);
for ($yy = $rand; $yy <=+ $rand +2; $yy + +) {
for ($px =-80; $px <=80; $px = $px +0.1)
{
$x = $px/$rand 1;
if ($x!=0)
{
$y =sin ($x);
}
$py = $y * $rand 2;

Imagesetpixel ($distortion _im, $px +80, $py + $yy, $text _c);
}
}

Set the file header;
Header ("Content-type:image/jpeg");

Export the image to a browser or file in PNG format;
Imagepng ($distortion _im);

Destroys an image, releasing the memory associated with image;
Imagedestroy ($distortion _im);
Imagedestroy ($im);
}

function Make_rand ($length = "32") {//Captcha text generation functions
$str = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
$result = "";
for ($i =0; $i < $length; $i + +) {
$num [$i]=rand (0,25);
$result. = $str [$num [$i]];
}
return $result;
}


Output call
$checkcode = Make_rand (4);
Session_Start ();//storing random numbers in session
$_session[' Helloweba_gg ']=strtolower ($checkcode);
Getauthimage ($checkcode);
?>

The Windows Server can. It's Ubuntu, No.

Check your font file path.
------Solution--------------------
You put 62 lines of Header ("Content-type:image/jpeg"); Comment out and you'll see the error message.
TTF is a font file for Windows, you need to install the support library

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