Library to parse, format and convert byte units

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0.3.0 2015-06-03 12:57 UTC


This is a utility component for parsing, formatting, converting and manipulating byte units in various formats.



// Bytes manipulation and formatting with explici precision
echo ByteUnits\parse('1.42MB')->add('256B')->format('kB/0000'); // outputs 1420.2560kB

// Bytes comparison
ByteUnits\parse('1.2GB')->isMoreThan('256MB'); // it's true


Right now two unit systems are supported:

  • The Metric system that is based on a 1000-byte kilobyte and uses standard SI suffixes (kB, MB, GB, TB, PB, …)
  • The Binary system that is based on a 1024-byte kilobyte and uses binary suffixes (KiB, MiB, GiB, TiB, PiB, …)

// Explicit system selection
echo ByteUnits\Metric::bytes(1000)->format();  // outputs 1.00kB
echo ByteUnits\Binary::bytes(1024)->format();  // outputs 1.00KiB

// Implicit selection through parsing
ByteUnits\parse('1.00kB'); // it's an instance of ByteUnits\Metric

// You can also constraint parsing to a specific system
ByteUnits\Metric::parse('1.00kB'); // it's an instance of ByteUnits\Metric
ByteUnits\Binary::parse('1.00kB'); // throws a ByteUnits\ParseException

// For each systems there are static constructors, one for each supported unit
echo ByteUnits\Metric::bytes(1000)->format();  // outputs 1.00kB
echo ByteUnits\Metric::kilobytes(1)->format();  // outputs 1.00kB
echo ByteUnits\Metric::megabytes(1)->format();  // outputs 1.00MB

// You can switch between systems
echo ByteUnits\Binary::bytes(1024)->asMetric()->format(); // outputs 1.02kB


In both systems you can format bytes with an appropriate format string


// By defaults it tries to format bytes in the most readable unit
echo ByteUnits\bytes(1322000)->format(); // outputs 1.32MB
echo ByteUnits\bytes(132200)->format(); // outputs 132.20kB

// You can force the unit using the related suffix
echo ByteUnits\bytes(1322000)->format('MB'); // outputs 1.32MB
echo ByteUnits\bytes(1322000)->format('kB'); // outputs 1322.00kB
echo ByteUnits\bytes(1322000)->format('B'); // outputs 1322000B

// You can choose the precision aka the number of digits after the `.`
echo ByteUnits\bytes(1322123)->format(6); // outputs 1.322123MB
echo ByteUnits\bytes(1322123)->format('/6'); // outputs 1.322123MB
echo ByteUnits\bytes(1322123)->format('MB/6'); // outputs 1.322123MB
echo ByteUnits\bytes(1322123)->format('MB/000000'); // outputs 1.322123MB
echo ByteUnits\bytes(1322123)->format('GB/9'); // outputs 0.001322123GB

// You can specify a separator between then number and the units
echo ByteUnits\bytes(1322000)->format('MB', ' '); // outputs 1.32 MB
echo ByteUnits\bytes(1322000)->format('MB', '/'); // outputs 1.32/MB


There are a few methods that could be used to compare bytes in various units and systems


ByteUnits\Metric::kilobytes(1)->isLessThan(ByteUnits\Binary::kilobytes(1)); // it's true
ByteUnits\Metric::kilobytes(1)->isEqualTo(ByteUnits\Binary::bytes(1000)); // it's true
ByteUnits\Metric::kilobytes(1.3)->isGreaterThan(ByteUnits\Binary::kilobytes(1)); // it's true


Also you can add or remove bytes in various units and systems


echo ByteUnits\Binary::kilobytes(1)->remove(ByteUnits\Metric::kilobytes(1))->format(); // outputs 24B

// Arithmetic operations always preserves the receiving unit system
echo ByteUnits\Binary::kilobytes(1)->add(ByteUnits\Metric::kilobytes(1))->format(); // outputs 1.98KiB

// You cannot have negative bytes
ByteUnits\Metric::kilobytes(1)->remove(ByteUnits\Binary::kilobytes(1))->format(); // throws ByteUnits\NegativeBytesException

Auto Boxing

Most of the methods can take integers or strings and box them to appropriate byte units

ByteUnits\Metric::kilobytes(1)->isLessThan('1KiB'); // it's true
echo ByteUnits\Binary::kilobytes(1)->remove('1KiB')->format(); // outputs 24B

Installation via Composer

  • Install Composer to your project root:

    curl -sS | php
  • Add a composer.json file to your project:

      "require": {
        "gabrielelana/byte-units": "0.2.*"
  • Run the Composer installer:

    php composer.phar install


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