Need to modify header in custom plugin

  • patrikelfstrom

    (@rcane)


    15 years, 7 months ago

    I’ve created an image upload plugin which creates a thumbnail with a black background.

    And to save that thumbnail I have to modify header.

    header('Content-Type: image/jpeg');
imagejpeg($background, $thumburl, 100);

    but I get

    Warning: Cannot modify header information - headers already sent by (output started at ...\wp-admin\menu-header.php:88) in ...\wp-content\plugins\gowest-gallery\thumbnails.php on line 76

    Anyone know how to fix this or a workaround?

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