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<?php
/**
 * Created by PhpStorm
 * User: Xinyu
 * Date: 16/8/25
 * Time: 下午10:09
 */
function unitConvert($scale){
    if($scale >= (1<<30)){
        $scale /= (1<<30);
        $scale = round($scale,2);
        echo $scale,'GB';
    }else if($scale >= (1<<20)){
        $scale /= (1<<20);
        $scale = round($scale,2);
        echo $scale,'MB';
    }else if($scale >= (1<<10)){
        $scale /= (1<<10);
        $scale = round($scale,2);
        echo $scale,'KB';
    }else{
        echo $scale,'B';
    }
}

?>