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                            第一種：
~~~
function formatSize($size) { 
    $sizes = array(" Bytes", " KB", " MB", " GB", " TB", " PB", " EB", " ZB", " YB"); 
    if ($size == 0) {  
        return('n/a');  
    } else { 
      return (round($size/pow(1024, ($i = floor(log($size, 1024)))), 2) . $sizes[$i]);  
    } 
}
~~~
-----
第二種：
~~~
function  format\_bytes($size,  $delimiter  \=  '')  {
$units  \=  array('B',  'KB',  'MB',  'GB',  'TB',  'PB');
for  ($i  \=  0;  $size  \>=  1024  &&  $i  <  5;  $i++)  $size  /=  1024;
return  round($size,  3)  .  $delimiter  .  $units\[$i\];
}
~~~
----
第三種：
~~~
function getFilesize($num){
    $p = 0;
    $format='bytes';
    if($num>0 && $num<1024){
        $p = 0;
        return number_format($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, $p);
    return number_format($num, 3).' '.$format;
}
~~~
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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