Human readable file size in php

human_filesize.php

<?php
// http://jeffreysambells.com/2012/10/25/human-readable-filesize-php + some edit
// https://gist.github.com/liunian/9338301 
function human_filesize($bytes, $decimals = 2)
{
    if ($bytes < 1024) {
        return $bytes . ' B';
    }

    $factor = floor(log($bytes, 1024));
    return sprintf("%.{$decimals}f ", $bytes / pow(1024, $factor)) . ['B', 'KB', 'MB', 'GB', 'TB', 'PB'][$factor];
}
# Tests
for ($num = 1022; $num < 1032; $num++) {
    echo $num, ': ', human_filesize($num), "\n";
}
echo $num, ': ', human_filesize(0), "\n";
echo $num, ': ', human_filesize(1048576), "\n";
echo $num, ': ', human_filesize(125890578), "\n";
echo $num, ': ', human_filesize(102400000000), "\n";
# Result 
/*
1022: 1022 B
1023: 1023 B
1024: 1.00 KB
1025: 1.00 KB
1026: 1.00 KB
1027: 1.00 KB
1028: 1.00 KB
1029: 1.00 KB
1030: 1.01 KB
1031: 1.01 KB
1032: 0 B
1032: 1.00 MB
1032: 120.06 MB
1032: 95.37 GB
*/