# base_convert

(PHP 4, PHP 5, PHP 7)

base_convert — Convert 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