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LinearSearch

hphp/hack/manual/apis/Classes/HH/ImmVector/linearSearch.md

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:::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

Hack
public function linearSearch(
  mixed $search_value,
): int;

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

Guide

Parameters

  • mixed $search_value - The value that will be searched for in the current ImmVector.

Returns

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

Examples

See Vector::linearSearch for usage examples.

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