PHP format byte size

How to format byte size in PHP.

/**
* 格式化字节大小
* @param  number $size      字节数
* @param  string $delimiter 数字和单位分隔符
* @return string            格式化后的带单位的大小
 */
function get_byte($size, $delimiter = '') {
    $units = array('B', 'KB', 'MB', 'GB', 'TB', 'PB');
    for ($i = 0; $size >= 1024 && $i < 5; $i++) $size /= 1024;
    return round($size, 2) . $delimiter . $units[$i];
}

Usage:

$size = '5454646';
echo get_byte($size);

Output:

5.2MB

Explanation:

Parameters $size is passed in the number of bytes, and the unit is kb through the method get_byte. Convert bytes to MB and back.