base_convert
(PHP 4, PHP 5, PHP 7, PHP 8)
base_convert — Convert a number between arbitrary bases
Description
$num, int $from_base, int $to_base): string
Returns a string containing num
represented in base to_base. The base in
which num is given is specified in
from_base. Both
from_base and to_base
have to be between 2 and 36, inclusive. Digits in numbers with a
base higher than 10 will be represented with the letters a-z,
with a meaning 10, b meaning 11 and z meaning 35.
The case of the letters doesn't matter, i.e.
num is interpreted case-insensitively.
base_convert() may lose precision on large numbers due to properties related to the internal "double" or "float" type used. Please see the Floating point numbers section in the manual for more specific information and limitations.
Parameters
-
num -
The number to convert. Any invalid characters in
numare silently ignored. As of PHP 7.4.0 supplying any invalid characters is deprecated. -
from_base -
The base
numis in -
to_base -
The base to convert
numto
Return Values
num converted to base to_base
Changelog
| Version | Description |
|---|---|
| 7.4.0 | Passing invalid characters will now generate a deprecation notice. The result will still be computed as if the invalid characters did not exist. |
Examples
Example #1 base_convert() example
<?php
$hexadecimal = 'a37334';
echo base_convert($hexadecimal, 16, 2);
?>
The above example will output:
101000110111001100110100
