PHP filesize MB/KB conversion

Question

How can I convert the output of PHP's filesize() function to a nice format with MegaBytes, KiloBytes etc?

like:

• if the size is less than 1 MB, show the size in KB
• if it's between 1 MB - 1 GB show it in MB
• if it's larger - in GB

Answer 1

Here is a sample:

<?php
// Snippet from PHP Share: http://www.phpshare.org

    function formatSizeUnits($bytes)
    {
        if ($bytes >= 1073741824)
        {
            $bytes = number_format($bytes / 1073741824, 2) . ' GB';
        }
        elseif ($bytes >= 1048576)
        {
            $bytes = number_format($bytes / 1048576, 2) . ' MB';
        }
        elseif ($bytes >= 1024)
        {
            $bytes = number_format($bytes / 1024, 2) . ' KB';
        }
        elseif ($bytes > 1)
        {
            $bytes = $bytes . ' bytes';
        }
        elseif ($bytes == 1)
        {
            $bytes = $bytes . ' byte';
        }
        else
        {
            $bytes = '0 bytes';
        }

        return $bytes;
}
?>

Answer 2

Even nicer is this version I created from a plugin I found:

function filesize_formatted($path)
{
    $size = filesize($path);
    $units = array( 'B', 'KB', 'MB', 'GB', 'TB', 'PB', 'EB', 'ZB', 'YB');
    $power = $size > 0 ? floor(log($size, 1024)) : 0;
    return number_format($size / pow(1024, $power), 2, '.', ',') . ' ' . $units[$power];
}

Note from filesize() doc

Because PHP's integer type is signed and many platforms use 32bit integers, some filesystem functions may return unexpected results for files which are larger than 2GB

Answer 3

A cleaner approach:

function Size($path)
{
    $bytes = sprintf('%u', filesize($path));

    if ($bytes > 0)
    {
        $unit = intval(log($bytes, 1024));
        $units = array('B', 'KB', 'MB', 'GB');

        if (array_key_exists($unit, $units) === true)
        {
            return sprintf('%d %s', $bytes / pow(1024, $unit), $units[$unit]);
        }
    }

    return $bytes;
}

Answer 4

I think this is a better approach. Simple and straight forward.

public function sizeFilter( $bytes )
{
    $label = array( 'B', 'KB', 'MB', 'GB', 'TB', 'PB' );
    for( $i = 0; $bytes >= 1024 && $i < ( count( $label ) -1 ); $bytes /= 1024, $i++ );
    return( round( $bytes, 2 ) . " " . $label[$i] );
}

Answer 5

This is based on @adnan's great answer.

Changes:

• added internal filesize() call
• return early style
• saving one concatentation on 1 byte

And you can still pull the filesize() call out of the function, in order to get a pure bytes formatting function. But this works on a file.

---

/**
 * Formats filesize in human readable way.
 *
 * @param file $file
 * @return string Formatted Filesize, e.g. "113.24 MB".
 */
function filesize_formatted($file)
{
    $bytes = filesize($file);

    if ($bytes >= 1073741824) {
        return number_format($bytes / 1073741824, 2) . ' GB';
    } elseif ($bytes >= 1048576) {
        return number_format($bytes / 1048576, 2) . ' MB';
    } elseif ($bytes >= 1024) {
        return number_format($bytes / 1024, 2) . ' KB';
    } elseif ($bytes > 1) {
        return $bytes . ' bytes';
    } elseif ($bytes == 1) {
        return '1 byte';
    } else {
        return '0 bytes';
    }
}

Answer 6

All the answers to the question uses that 1 kilobyte = 1024 bytes which is wrong! (1 kibibyte = 1024 bytes)

since the question asks to convert file sizes, it should use that 1 kilobyte = 1000 bytes (see https://wiki.ubuntu.com/UnitsPolicy)

function format_bytes($bytes, $precision = 2) {
    $units = array('B', 'KB', 'MB', 'GB');

    $bytes = max($bytes, 0);
    $pow = floor(($bytes ? log($bytes) : 0) / log(1000));
    $pow = min($pow, count($units) - 1);

    $bytes /= pow(1000, $pow);

    return round($bytes, $precision) . ' ' . $units[$pow];
}

Answer 7

This would be a cleaner implementation:

function size2Byte($size) {
    $units = array('KB', 'MB', 'GB', 'TB');
    $currUnit = '';
    while (count($units) > 0  &&  $size > 1024) {
        $currUnit = array_shift($units);
        $size /= 1024;
    }
    return ($size | 0) . $currUnit;
}

Answer 8

function calcSize($size,$accuracy=2) {
    $units = array('b','Kb','Mb','Gb');
    foreach($units as $n=>$u) {
        $div = pow(1024,$n);
        if($size > $div) $output = number_format($size/$div,$accuracy).$u;
    }
    return $output;
}

Answer 9

A complete example.

<?php
    $units = explode(' ','B KB MB GB TB PB');
    echo("<html><body>");
    echo('file size: ' . format_size(filesize("example.txt")));
    echo("</body></html>");


    function format_size($size) {

        $mod = 1024;

        for ($i = 0; $size > $mod; $i++) {
            $size /= $mod;
        }

        $endIndex = strpos($size, ".")+3;

        return substr( $size, 0, $endIndex).' '.$units[$i];
    }
?>

Answer 10

function getNiceFileSize($file, $digits = 2){
    if (is_file($file)) {
        $filePath = $file;
        if (!realpath($filePath)) {
            $filePath = $_SERVER["DOCUMENT_ROOT"] . $filePath;
        }
        $fileSize = filesize($filePath);
        $sizes = array("TB", "GB", "MB", "KB", "B");
        $total = count($sizes);
        while ($total-- && $fileSize > 1024) {
            $fileSize /= 1024;
        }
        return round($fileSize, $digits) . " " . $sizes[$total];
    }
    return false;
}

Answer 11

//Get the size in bytes
function calculateFileSize($size)
{
   $sizes = ['B', 'KB', 'MB', 'GB'];
   $count=0;
   if ($size < 1024) {
    return $size . " " . $sizes[$count];
    } else{
     while ($size>1024){
        $size=round($size/1024,2);
        $count++;
    }
     return $size . " " . $sizes[$count];
   }
}