This function calculates the size of a file in bytes, kilobytes, megabytes and gigabytes.

<?php
function get_file_size($filename, $size_in = 'MB')
{
$size_in_bytes = filesize($filename);

// Precision: decimals at the end for each type of size

if($size_in == 'B')
{
$size = $size_in_bytes;
$precision = 0;
}
elseif($size_in == 'KB')
{
$size = (($size_in_bytes / 1024));
$precision = 2;
}
elseif($size_in == 'MB')
{
$size = (($size_in_bytes / 1024) / 1024);
$precision = 2;
}
elseif($size_in == 'GB')
{
$size = (($size_in_bytes / 1024) / 1024) / 1024;
$precision = 2;
}

$size = round($size, $precision);

	return $size.' '.$size_in;
}

$file = '/path/to/public_html/folder/my_file.zip';

# 1st argument: path to file
# 2st argument: calculate in: B (Bytes), KB (Kilobytes), MB (Megabytes), GB (Gigabytes)

echo get_file_size($file, 'MB');
?>

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