Block on one or more asynchronous operations, or until the specified timeout has occurred
function mysql_async_wait_actionable( array $items, float $double, ): mixed;
Returns values from the 'items' parameter when they become actionable. Entries are returned as soon as they are actionable (i.e., it does not wait for the entire timeout before returning results).
array $items- An array of arrays. These arrays contain a MySQL link identifier in the 0'th position, and any other values in the remainder of the array. Items from this parameter are returned unmodified as the result set of actionable entries.
mixed- - Returns input entries that are now ready for action (such as a connection has completed or rows are available).