php获取文件大小，两条代码搞定
function get_size($s,$u='B',$p=1){$us = array('B'=>'K','K'=>'M','M'=>'G','G'=>'T');return (($u!=='B')&&(!isset($us[$u]))||($s<1024))?(number_format($s,$p)." $u"):(get_size($s/1024,$us[$u],$p));}
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