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base_convert

Description

The base_convert of Math for PHP convert a number between arbitrary bases.

Syntax

base_convert(
    string $num,
    int $from_base,
    int $to_base
): string

Parameters

num

The number to convert. Any invalid characters in num are silently ignored.

from_base

The base num is in.

to_base

The base to convert num to.

Return

Returns num converted to base to_base

Examples

1 · num from_base to_base

<?

$num = 16;
$from_base = 10;
$to_base = 2;

$return = base_convert($num, $from_base, $to_base);

echo $return;

10000

2 · from decimal to binary

<?

for($i = 0; $i < 16; ++$i)
{
    $num = $i;
    $from_base = 10;
    $to_base = 2;
    
    $return = base_convert($num, $from_base, $to_base);
    
    echo $num . ":" . $return . PHP_EOL;
}

0:0
1:1
2:10
3:11
4:100
5:101
6:110
7:111
8:1000
9:1001
10:1010
11:1011
12:1100
13:1101
14:1110
15:1111

3 · from decimal to octal

<?

for($i = 0; $i < 16; ++$i)
{
    $num = $i;
    $from_base = 10;
    $to_base = 8;
    
    $return = base_convert($num, $from_base, $to_base);
    
    echo $num . ":" . $return . PHP_EOL;
}

0:0
1:1
2:2
3:3
4:4
5:5
6:6
7:7
8:10
9:11
10:12
11:13
12:14
13:15
14:16
15:17

4 · from decimal to hexadecimal

<?

for($i = 0; $i < 16; ++$i)
{
    $num = $i;
    $from_base = 10;
    $to_base = 16;
    
    $return = base_convert($num, $from_base, $to_base);
    
    echo $num . ":" . $return . PHP_EOL;
}

0:0
1:1
2:2
3:3
4:4
5:5
6:6
7:7
8:8
9:9
10:a
11:b
12:c
13:d
14:e
15:f