Руководство по PHP
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# base_convert

(PHP 3 >= 3.0.6, PHP 4, PHP 5)

base_convert -- Convert a number between arbitrary bases

## Description

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

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.

Пример 1. base_convert() example

`<?php $hexadecimal = 'A37334'; echo base_convert($hexadecimal, 16, 2); ?>`

Outputs:

    101000110111001100110100

Внимание
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.

See also: intval().

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