php文件大小计算
function getFilesize($num){
$p = 0;
$format='bytes';
if($num>0 && $num<1024){
$p = 0;
return sprintf("%.2f",number_format($num)).' '.$format;
}
if($num>=1024 && $num<pow(1024, 2)){
$p = 1;
$format = 'KB';
}
if ($num>=pow(1024, 2) && $num<pow(1024, 3)) {
$p = 2;
$format = 'MB';
}
if ($num>=pow(1024, 3) && $num<pow(1024, 4)) {
$p = 3;
$format = 'GB';
}
if ($num>=pow(1024, 4) && $num<pow(1024, 5)) {
$p = 3;
$format = 'TB';
}
$num /= pow(1024, $p);
return sprintf("%.2f",number_format($num, 3)).' '.$format;
}
getFilesize('10240')
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