Running the output through escaping function should be just fine.
You can either use wp_kses_post()
, which by default allows the same html attributes that you would use in the post content (see in codex):
echo wp_kses_post( wp_get_attachment_image( $image_id ) );
or if you want to be more precise and strict, you can pass an array with allowed attributes for that particular context, like so:
echo wp_kses( wp_get_attachment_image( $image_id ), [
'img' => [
'src' => true,
'srcset' => true,
'sizes' => true,
'class' => true,
'id' => true,
'width' => true,
'height' => true,
'alt' => true,
'align' => true,
],
] );
It’s up to you to decide what is allowed, just change the array contents to adjust to your needs!
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