(mongodb >=1.3.0)
MongoDB\BSON\TypeWrapper::toBSONType — Converts the BSON type to a PHP value
Called during serialization of the object to BSON. The method may return any PHP value, which will be converted to a BSON.
If the class implementing MongoDB\BSON\TypeWrapper wraps a MongoDB\BSON\Type object, this method should likely return the wrapped object.
Note:
If this method returns a MongoDB\BSON\Serializable or another MongoDB\BSON\TypeWrapper instance, the return value will be converted accordingly (e.g. MongoDB\BSON\Serializable::bsonSerialize() or MongoDB\BSON\TypeWrapper::toBSONType() will be called on the returned object). An exception will be thrown during BSON serialization if the driver detects recursion (e.g. this method returns its own instance).
此函数没有参数。
A PHP value to be serialized to BSON in place of the MongoDB\BSON\TypeWrapper object.
Example #1 MongoDB\BSON\TypeWrapper::toBSONType() used to wrap a UTCDateTime
<?php
class LocalDateTime implements MongoDB\BSON\TypeWrapper, MongoDB\BSON\UTCDateTimeInterface
{
private $localDateTime;
public function __construct(DateTime $dateTime)
{
$this->localDateTime = clone $dateTime;
$this->localDateTime->setTimezone(new DateTimeZone(date_default_timezone_get()));
}
public static function createFromBSONType(MongoDB\BSON\Type $type)
{
if ( ! $type instanceof MongoDB\BSON\UTCDateTime) {
throw new InvalidArgumentException('Cannot create MyUTCDateTime from ' . get_class($type));
}
return new self($type->toDateTime());
}
public function toBSONType()
{
return new MongoDB\BSON\UTCDateTime($this->localDateTime);
}
public function toDateTime()
{
return clone $this->localDateTime;
}
public function __toString()
{
return (string) $this->toBSONType();
}
}
$bson = MongoDB\BSON\fromJSON('{ "date": { "$date": "2015-10-28T00:00:00Z" }}');
$document = MongoDB\BSON\toPHP($bson, ['types' => ['UTCDateTime' => 'LocalDateTime']]);
var_dump($document);
$bson = MongoDB\BSON\fromPHP($document);
echo MongoDB\BSON\toRelaxedExtendedJSON($bson), "\n";
?>
以上例程的输出类似于：
object(stdClass)#1 (1) {
["date"]=>
object(LocalDateTime)#2 (1) {
["localDateTime":"LocalDateTime":private]=>
object(DateTime)#4 (3) {
["date"]=>
string(26) "2015-10-27 20:00:00.000000"
["timezone_type"]=>
int(3)
["timezone"]=>
string(16) "America/New_York"
}
}
}
{ "date" : { "$date" : "2015-10-28T00:00:00Z" } }