Description:
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Hello. Looks like imagerotate do not save alpha for gifs.. 

There is example of code:



Reproduce code:
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<?php

$im = imagecreatefrompng( dirname( $_SERVER['SCRIPT_FILENAME'] ) . '/gifs/0.png' );
$tr = imagecolortransparent( $im );
$r = imagerotate( $im, 45., $tr );
imagesavealpha( $r, true );

//Png works perfect
//header( 'Content-type: image/png' ); 
//imagepng( $r );

//Gifs does not works.. black or while or gray background.. :(
header( 'Content-type: image/gif' );
imagegif( $r );

?>

Expected result:
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it should be rotated transparent image

Actual result:
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background color instead transparent background