How to solve the problem of garbled characters when outputting images to WeChat browser using gd library in PHP

#How to solve the problem of garbled characters when using gd to output images to WeChat browser in PHP?

The procedure is as follows:

<?php
$im = imagecreate(200, 300);
$white = imagecolorallocate($im, 8, 2, 133);
imagegif($im);
 ?>

After entering the address of the PHP file in the browser, I found that the following garbled characters were displayed:

After After further study, I found that for images created with the GD library, you need to use the function header('content-type:image/gif'); to specify which format to output. If you don't specify it, it will be garbled. .

The modified code is as follows:

<?php
// header(&#39;content-type:image/gif&#39;);
$im = imagecreate(200, 300);
$white = imagecolorallocate($im, 8, 2, 133);
header(&#39;content-type:image/gif&#39;);
imagegif($im);
 ?>

The modified picture is displayed as follows:

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