(mongodb >=1.2.0)
MongoDB\Driver\ReadPreference::bsonSerialize — 傳回一個物件以進行 BSON 序列化
此函式沒有參數。
傳回一個物件，用於將 ReadPreference 序列化為 BSON。
範例 #1 使用主要讀取偏好設定的 MongoDB\Driver\ReadPreference::bsonSerialize()
<?php
$rp = new MongoDB\Driver\ReadPreference(MongoDB\Driver\ReadPreference::PRIMARY);
var_dump($rp->bsonSerialize());
echo "\n", MongoDB\BSON\Document::fromPHP($rp)->toRelaxedExtendedJSON();
?>以上範例會輸出類似以下的內容：
object(stdClass)#2 (1) {
["mode"]=>
string(7) "primary"
}
{ "mode" : "primary" }
範例 #2 使用 secondary 讀取偏好設定和標籤集的 MongoDB\Driver\ReadPreference::bsonSerialize()
<?php
$rp = new MongoDB\Driver\ReadPreference(
MongoDB\Driver\ReadPreference::SECONDARY,
[
['dc' => 'ny'],
['dc' => 'sf', 'use' => 'reporting'],
[]
]
);
var_dump($rp->bsonSerialize());
echo "\n", MongoDB\BSON\Document::fromPHP($rp)->toRelaxedExtendedJSON();
?>以上範例會輸出類似以下的內容：
object(stdClass)#2 (2) {
["mode"]=>
string(9) "secondary"
["tags"]=>
array(3) {
[0]=>
object(stdClass)#1 (1) {
["dc"]=>
string(2) "ny"
}
[1]=>
object(stdClass)#5 (2) {
["dc"]=>
string(2) "sf"
["use"]=>
string(9) "reporting"
}
[2]=>
object(stdClass)#4 (0) {
}
}
}
{ "mode" : "secondary", "tags" : [ { "dc" : "ny" }, { "dc" : "sf", "use" : "reporting" }, { } ] }
範例 #3 使用 secondary 讀取偏好設定和最大延遲的 MongoDB\Driver\ReadPreference::bsonSerialize()
<?php
$rp = new MongoDB\Driver\ReadPreference(
MongoDB\Driver\ReadPreference::SECONDARY,
null,
['maxStalenessSeconds' => 120]
);
var_dump($rp->bsonSerialize());
echo "\n", MongoDB\BSON\Document::fromPHP($rp)->toRelaxedExtendedJSON();
?>以上範例會輸出類似以下的內容：
object(stdClass)#2 (2) {
["mode"]=>
string(9) "secondary"
["maxStalenessSeconds"]=>
int(120)
}
{ "mode" : "secondary", "maxStalenessSeconds" : 120 }