Max

:::info[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. :::

Returns the largest element of the given Traversable, or null if the Traversable is empty

namespace HH\Lib\Math;

function max<T as num>(
  Traversable<T> $numbers,
): ?T;

• For a known number of inputs, see Math\maxva().
• To find the smallest number, see Math\min().

Parameters

• Traversable<T>$numbers

Returns

• ?T

Examples

$v = vec[3, 2, 6, 1, 4];
$max = Math\max($v);
echo "The max is $max";