from_base

Note

This is a point-in-time snapshot of the API documentation from January 2026. Going forward, we will not be maintaining a public copy of these references, and recommend users to refer to the built-in signature helpers available in the Hack LSP instead for complete and up-to-date information.

Converts the given string in the given base to an int, assuming letters a-z are used for digits when $from_base > 10

namespace HH\Lib\Math;

function from_base(
  string $number,
  int $from_base,
): int;

To base convert an int into a string, see Math\to_base().

Parameters

• string $number
• int $from_base

Returns

• int

Examples

$val1 = Math\from_base("101", 2);
echo "101 in base 2 represents the number $val1 \n";

$val2 = Math\from_base("e", 16);
echo "e in base 16 represents the number $val2 \n";