IDs
Every document needs a unique, immutable ID
ID consists of: 4-byte timestamp, 3-byte machine identifier, 2-byte PID and 3-byte counter:
%|994444|507e6384| |449944|44670a| |444499|3e6e| |999944|000000|%
demo->articles;
$c->insert( [ 'name' => 'Derick', '_id' => 'derickr' ] );
$d = [ 'name' => 'Derick' ];
$c->insert( $d );
var_dump( $d );
?>]]>