HH\Lib\C\contains_key

This API is part of the Hack Standard Library, not HHVM itself.
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This function is available as C\contains_key() in Facebook's www repository.

Returns true if the given KeyedContainer contains the key

Description

namespace HH\Lib\C;

function contains_key<Tk, Tv>(
  KeyedContainer<Tk, Tv> $container,
  Tk $key,
): bool;

Parameters