The image "http://localhost/loginCaptcha.php" cannot be displayed because it contains errors

Question

I am trying to get a CAPTCHA to work. I have PHP files:

loginCaptcha.php

<?php
session_start();
header('Content-type: image/jpeg');

$text = $_SESSION['secure'];
$font_size = 30;

$image_width = 200;
$image_height = 40;

$image = imagecreate($image_width, $image_height);
imagecolorallocate($image, 255, 255, 255);
$text_color = imagecolorallocate($image, 0, 0, 0);

imagettftext($image, $font_size, 0, 15, 30, $text_color, 'font.ttf', $text);
imagejpeg($image);
?>

starter.php

<?php
session_start();
$_SESSION['secure'] = rand(1000,9999);
?>

<img src="loginCaptcha.php" />

When I run loginCaptcha.php the error comes from the title. When I run starter.php I get what looks like an undefined image. I checked and I have "gd" installed. I am using xampp so it came with it but I double checked anyway.

I read other solutions but they did not really help me.

Thanks.

Answer 1

There is probably something wrong with your PHP code or something is bugging.

You could try removing the content-type header and see what your PHP outputs, there will most likely be a notice, error or warning which prevents your browser from reading a binary request because it contains ascii text

Answer 2

try after installing php gd

# apt-get install php5-gd

or

# sudo apt-get install php5-gd

you must restart the web service after installing php-gd.

Answer 3

OK. the only thing, that comes into my mind is to check absolutely minimal working example. So try to make a file called for examle image.php, and write there:

<?php
    header('Content-Type: image/jpeg');
    $image_width = 200;
    $image_height = 40;
    $image = imagecreate($image_width, $image_height);
    imagejpeg($image);
?>

And check if it is working (localhost/image.php or something like that). The browser should display something that is image. Be 100% sure, that Content-Type (Type) is from capital 'T'. Some browsers had problems with that (PHP Header - Content-type: image/jpeg - Not working for Internet Explorer).

Then please write in comment what happens. If there are any problems, please remove the header line. Then php should "error" something :). Hope it helps... I will update this post due to Your answers, as there is to little that we know, to answer it just like that :).

Best regards.