gaptekupdate

if you have many sites with w3tc error &$buffer that you wanted to repair, just try this sed command to replace them all with $buffer

cd /home;
find -type f -name 'PgCache.php' -exec sed -i 's;ob_callback(\&\$buffer);ob_callback(\$buffer);g' {} \;
find -type f -name 'BrowserCache.php' -exec sed -i 's;ob_callback(\&\$buffer);ob_callback(\$buffer);g' {} \;
find -type f -name 'Cdn.php' -exec sed -i 's;ob_callback(\&\$buffer);ob_callback(\$buffer);g' {} \;
find -type f -name 'Minify.php' -exec sed -i 's;ob_callback(\&\$buffer);ob_callback(\$buffer);g' {} \;
find -type f -name 'NewRelic.php' -exec sed -i 's;ob_callback(\&\$buffer);ob_callback(\$buffer);g' {} \;
find -type f -name 'TotalCache.php' -exec sed -i 's;ob_callback(\&\$buffer);ob_callback(\$buffer);g' {} \;

add this to your theme functions.php

function _remove_script_version( $src ){
    $parts = explode( '?ver', $src );
        return $parts[0];
}
add_filter( 'script_loader_src', '_remove_script_version', 15, 1 );
add_filter( 'style_loader_src', '_remove_script_version', 15, 1 );