HH\Lib\C\contains_key
Returns true if the given KeyedContainer contains the key
namespace HH\Lib\C;
function contains_key<Tk1 as arraykey, Tk2 as arraykey, Tv>(
KeyedContainer<Tk1, Tv> $container,
Tk2 $key,
): bool;
Time complexity: O(1) Space complexity: O(1)
Parameters
KeyedContainer<Tk1,Tv> $containerTk2 $key
Returns
bool
Examples
$dict = dict["key_1" => "a", "key_2" => "b"];
$contains_key_result_1 = C\contains_key($dict, "key_1");
echo "First contains key result: $contains_key_result_1\n";
//Output: First contains key result: true
$contains_key_result_2 = C\contains_key($dict, "key_3");
echo "Second contains key result: $contains_key_result_2\n";
//Output: Second contains key result: false
$contains_key_result_3 = C\contains_key($dict, "");
echo "Third contains key result: $contains_key_result_3\n";
//Output: Third contains key result: false