(mongodb >=1.0.0)
MongoDB\BSON\UTCDateTime::__toString — Returns the string representation of this UTCDateTime
此函数没有参数。
Returns the string representation of this UTCDateTime.
示例 #1 MongoDB\BSON\UTCDateTime::__toString() example
<?php
$utcdatetime = new MongoDB\BSON\UTCDateTime(1416445411987);
var_dump((string) $utcdatetime);
?>以上示例会输出：
string(13) "1416445411987"