byte-units-master转换字节单位的PHP库

<?php
namespace ByteUnits;
class ArithmeticTest extends \PHPUnit_Framework_TestCase
{
    public function testAddInSameUnitSystem()
    {
        $this->assertEquals(Metric::bytes(10), Metric::bytes(5)->add(Metric::bytes(5)));
        $this->assertEquals(Binary::bytes(10), Binary::bytes(5)->add(Binary::bytes(5)));
    }
    public function testRemoveInSameUnitSystem()
    {
        $this->assertEquals(Metric::bytes(3), Metric::bytes(5)->remove(Metric::bytes(2)));
        $this->assertEquals(Binary::bytes(3), Binary::bytes(5)->remove(Binary::bytes(2)));
    }
    public function testAutoboxing()
    {
        $this->assertEquals(Metric::bytes(10), Metric::bytes(5)->add(5));
        $this->assertEquals(Metric::bytes(10), Metric::bytes(5)->add('5B'));
        $this->assertEquals(Metric::bytes(3), Metric::bytes(5)->remove(2));
        $this->assertEquals(Metric::bytes(3), Metric::bytes(5)->remove('2B'));
    }

本库可以快速的帮你转换字节单位。

1个字节等于8bit
即1byte = 8 bit,下面是KB,MB,GB,TB的换算
1KB = 1024 byte
1MB = 1024KB = 1024 X 1024byte
1GB = 1024MB
1TB = 1024GB