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if(file_exists($filepath)){
            $size = filesize($filepath);
            $unim = array("Bytes","KB","MB","GB","TB","PB");
            $count=0;

            while($size >= 1024 ){
                    $count++;
                    $size = $size/1024;
            }
            $size = round($size,2);
            echo $size.$unim[$count];

    }else{
            echo "not exists";
    }
}