captcha displaying in a funny way

StackOverflow https://stackoverflow.com/questions/19930412

  •  30-07-2022
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Question

I have a captcha Code which works perfectly but I really dont know why it displays funny. Can anyone help me figure out what might be the cause of this? Here is the code:

<?php
session_start();
$text = rand(10000,99999);
$_SESSION["vercode"] = $text;
$height = 25;
$width = 65;
$image_p = imagecreate($width, $height);
$black = imagecolorallocate($image_p, 0, 0, 0);
$white = imagecolorallocate($image_p, 255, 255, 255);
$font_size = 14;
imagestring($image_p, $font_size, 5, 5, $text, $white);
imagejpeg($image_p, null, 80);
?>

This is what is displays:

kX’OýÓx£Ç> ñ=¨µÖ/b{ct÷¯½¬6É-ÀiH¡ä csdòyäæcÆ^"Ö|7¥è¦­ss¤i™û%³‘¶>02q–Ú2q;A!p+Ÿ¢€:¿øX>'þÂþÈþÓÿDûöo™öx¾Ñö]Û¼?o›ågø7mÇËŒqF‡ñÄú•Ÿ¦j~M½·öWkx¤šÓÎ]²ù²™!Ü:ìeä“Ô“\¥QEQEÿÙ

Was it helpful?

Solution

You're missing the header. Add the following after session_start():

header('Content-Type: image/jpeg');

The output will be something like:

enter image description here

OTHER TIPS

When you're creating an image like this, you need to tell the browser what type of content you're wanting to display. Hence the reason:

header("Content-type: image/jpeg");

is needed. Read the Wiki article on MIME if this confuses you. You'll also find that you'll need to specify the content type whenever you're generating other file types as well (for example: PDF files generated on the fly with PHP will require header('Content-type: application/pdf'); )

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