Damit klappt es, scheinbar …
<?php $bytes= disk_free_space("/"); $si_prefix = array( 'B', 'KB', 'MB', 'GB', 'TB', 'EB', 'ZB', 'YB' ); $base = 1024; $class = min((int)log($bytes , $base) , count($si_prefix) - 1); // echo $bytes . ' '; echo sprintf('%1.2f' , $bytes / pow($base,$class)) . ' ' . $si_prefix[$class] . ' '; ?>