--TEST-- MongoDB\BSON\Int64::jsonSerialize() with json_encode() --FILE-- new MongoDB\BSON\Int64('9223372036854775807')], ['min' => new MongoDB\BSON\Int64('-9223372036854775808')], ['zero' => new MongoDB\BSON\Int64(0)], ]; foreach ($tests as $test) { var_dump(json_encode($test)); } ?> ===DONE=== --EXPECT-- string(45) "{"max":{"$numberLong":"9223372036854775807"}}" string(46) "{"min":{"$numberLong":"-9223372036854775808"}}" string(28) "{"zero":{"$numberLong":"0"}}" ===DONE===