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[Edit] Conversion SizeTo Detailed B, KB, MB, GB, TB

Example

echo filesize_tag(123456); // 120 KB

echo filesize_tag(123456789); // 117 MB

echo filesize_tag(12345,true); // 12 KB, 57 B

echo filesize_tag(filesize('somefile.txt')); // size of the file...
Save 10,670 size 
function filesize_tag($size,$full=false){
    $sizes = array();
    $tags  = array(' B', ' KB', ' MB', ' GB', ' TB');
    $i = 0;
    $sizes[$i] = $size;
    $i++;
    while($size > 1024){
        $size = floor($size / 1024);
        $sizes[$i] = $size;
        $i++;
    }
    foreach($sizes as $key=>$size){
        $subtract = array_key_exists(($key + 1), $sizes) ? $sizes[$key + 1] * 1024 : 0;
        $sizes[$key] = $sizes[$key] - $subtract . $tags[$key];
    }
    return $full ? implode(', ',array_reverse($sizes)) : $sizes[sizeof($sizes) - 1];
}