W3cubDocs

/PHP

base_convert

(PHP 4, PHP 5, PHP 7)

base_convertConvert a number between arbitrary bases

Description

base_convert ( string $number , int $frombase , int $tobase ) : string

Returns a string containing number represented in base tobase. The base in which number is given is specified in frombase. Both frombase and tobase 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. number is interpreted case-insensitively.

Warning

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

number

The number to convert. Any invalid characters in number are silently ignored. As of PHP 7.4.0 supplying any invalid characters is deprecated.

frombase

The base number is in

tobase

The base to convert number to

Return Values

number converted to base tobase

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

See Also

  • intval() - Get the integer value of a variable

© 1997–2020 The PHP Documentation Group
Licensed under the Creative Commons Attribution License v3.0 or later.
https://www.php.net/manual/en/function.base-convert.php