In PHP, how do I check in the most efficient way if a specific value exists in an array containing thousands of values?

A quick way of doing this has been shown below −

if (array_flip($set)[$value] !== null) {
   echo "something"; //take some action
}

To customize the number of keys, you can customize it as follows−

function array_keys_exists(array $keys, array $arr) {
   return !array_diff_key(array_flip($keys), $arr);
}

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