force image download using php

$file = "filename.gif";
if (file_exists($file)) {
    if(ini_get('zlib.output_compression'))
   	ini_set('zlib.output_compression', 'Off');
    header('Content-Description: File Transfer');
    header('Content-Type: application/octet-stream');
    header('Content-Disposition: attachment; filename='.basename($file));
    header('Content-Transfer-Encoding: binary');
    header('Expires: 0');
    header('Cache-Control: must-revalidate, post-check=0, pre-check=0');
    header('Pragma: public');
    header('Content-Length: ' . filesize($file));
    ob_clean();
    flush();
    readfile($file);
    exit;
}

Set the variable “zlib.output_compression” to Off on the php.ini

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force image download using php

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