(mongodb >=1.5.0)
MongoDB\BSON\Int64::__toString — Returns the string representation of this Int64
此函数没有参数。
Returns the string representation of this Int64.
示例 #1 MongoDB\BSON\Int64::__toString() example
<?php
$int64 = new MongoDB\BSON\Int64('9223372036854775807');
var_dump((string) $int64);
?>以上示例的输出类似于：
string(19) "9223372036854775807"