LinearSearch

:::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 index of the first element that matches the search value

public function linearSearch<Tu super mixed>(
  mixed $search_value,
): int;

If no element matches the search value, this function returns -1.

Guide

• Constraints

Parameters

• mixed $search_value - The value that will be search for in the current Pair.

Returns

• int - The key (index) where that value is found; -1 if it is not found.

Examples

$p = Pair {'foo', -1.5};

// Prints 0 (the index of the first value)
\var_dump($p->linearSearch('foo'));

// Prints 1 (the index of the second value)
\var_dump($p->linearSearch(-1.5));

// Prints -1 (the value doesn't exist in the Pair)
\var_dump($p->linearSearch('bar'));