ByteSize

A small immutable PHP value object for byte-size conversion and formatting.

ByteSize provides a clean API for converting, formatting, and displaying byte-based values in PHP applications.

ByteSize helps you:

• create a size from bytes, KB, MB, GB, or TB
• convert the value to any supported unit
• format values for UI and logs
• generate human-readable output

Why ByteSize?

• immutable and predictable value object
• explicit decimal unit conversion
• clean formatting API with customizable labels
• useful for file sizes, storage usage, logs, CLI output, and UI rendering

The library uses decimal units:

• 1 KB = 1000 B
• 1 MB = 1000 KB
• 1 GB = 1000 MB
• 1 TB = 1000 GB

Installation

composer require elephant-php/byte-size

Requirements

• PHP 8.1 or higher

Basic usage

use ElephantPhp\ByteSize\ByteSize;

$size = ByteSize::fromBytes(2_500_000);

echo $size->toBytes();      // 2500000
echo $size->toKilobytes();  // 2500
echo $size->toMegabytes();  // 2.5
echo $size->toGigabytes();  // 0.0025
echo $size->toTerabytes();  // 0.0000025

Creation

use ElephantPhp\ByteSize\ByteSize;

ByteSize::fromBytes(2500000);
ByteSize::fromKilobytes(2500);
ByteSize::fromMegabytes(2.5);
ByteSize::fromGigabytes(0.0025);
ByteSize::fromTerabytes(0.0000025);

Conversion

use ElephantPhp\ByteSize\ByteSize;

$size = ByteSize::fromBytes(2_500_000);

$size->toBytes();      // 2500000
$size->toKilobytes();  // 2500
$size->toMegabytes();  // 2.5
$size->toGigabytes();  // 0.0025
$size->toTerabytes();  // 0.0000025

Formatting

Use format() when you want an explicit unit.

use ElephantPhp\ByteSize\ByteSize;
use ElephantPhp\ByteSize\ByteSizeUnit;

$size = ByteSize::fromBytes(2_500_000);

echo $size->format(ByteSizeUnit::TERABYTES, 7);        // 0.0000025 TB
echo $size->format(ByteSizeUnit::TERABYTES, 7, '');    // 0.0000025
echo $size->format(ByteSizeUnit::MEGABYTES, 2);        // 2.5 MB
echo $size->format(ByteSizeUnit::MEGABYTES, 2, 'МБ');  // 2.5 МБ
echo $size->format(ByteSizeUnit::MEGABYTES, 2, 'MBs'); // 2.5 MBs

Arguments:

• $unit is the unit you want to format to
• $precision is the maximum number of decimal places before trimming trailing zeros
• $label overrides the default unit label

Label behavior:

• null uses the default label from ByteSizeUnit
• '' returns only the numeric value
• any other string is used as a custom label

Human-readable output

Use human() when you want the library to choose the most suitable unit automatically.

use ElephantPhp\ByteSize\ByteSize;

$size = ByteSize::fromBytes(2_500_000);

echo $size->human();      // 2.5 MB
echo $size->human('МБ');  // 2.5 МБ
echo (string) $size;      // 2.5 MB

Examples of automatic unit switching:

ByteSize::fromBytes(999)->human();                // 999 B
ByteSize::fromBytes(1000)->human();               // 1 KB
ByteSize::fromBytes(1000000)->human();            // 1 MB
ByteSize::fromBytes(1000000000)->human();         // 1 GB
ByteSize::fromBytes(1000000000000)->human();      // 1 TB

Available units

use ElephantPhp\ByteSize\ByteSizeUnit;

ByteSizeUnit::BYTES;
ByteSizeUnit::KILOBYTES;
ByteSizeUnit::MEGABYTES;
ByteSizeUnit::GIGABYTES;
ByteSizeUnit::TERABYTES;

Testing

vendor/bin/testo run

License

MIT License

Please see LICENSE for more information.