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Serialization to BSON
Arrays
If an array is a packed array — i.e. the keys start at 0 and are sequential without gaps: BSON array.
If the array is not packed — i.e. having associative (string) keys, the keys don't start at 0, or when there are gaps:: BSON object
A top-level (root) document, always serializes as a BSON document.
Examples
These serialize as a BSON array:
[ 8, 5, 2, 3 ] => [ 8, 5, 2, 3 ] [ 0 => 4, 1 => 9 ] => [ 4, 9 ]
These serialize as a BSON document:
[ 0 => 1, 2 => 8, 3 => 12 ] => { "0" : 1, "2" : 8, "3" : 12 }
[ "foo" => 42 ] => { "foo" : 42 }
[ 1 => 9, 0 => 10 ] => { "1" : 9, "0" : 10 }
Note that the five examples are extracts of a full document, and represent only one value inside a document.
Objects
If an object is of the stdClass class, serialize as a BSON document.
If an object is a supported class that implements MongoDB\BSON\Type, then use the BSON serialization logic for that specific type. MongoDB\BSON\Type instances (excluding MongoDB\BSON\Serializable may only be serialized as a document field value. Attempting to serialize such an object as a root document will throw a MongoDB\Driver\Exception\UnexpectedValueException
If an object is of an unknown class implementing the MongoDB\BSON\Type interface, then throw a MongoDB\Driver\Exception\UnexpectedValueException
If an object is of any other class, without implementing any special interface, serialize as a BSON document. Keep only public properties, and ignore protected and private properties.
If an object is of a class that implements the MongoDB\BSON\Serializable interface, call MongoDB\BSON\Serializable::bsonSerialize() and use the returned array or stdClass to serialize as a BSON document or array. The BSON type will be determined by the following:
-
Root documents must be serialized as a BSON document.
-
MongoDB\BSON\Persistable objects must be serialized as a BSON document.
-
If MongoDB\BSON\Serializable::bsonSerialize() returns a packed array, serialize as a BSON array.
-
If MongoDB\BSON\Serializable::bsonSerialize() returns a non-packed array or stdClass, serialize as a BSON document.
-
If MongoDB\BSON\Serializable::bsonSerialize() did not return an array or stdClass, throw an MongoDB\Driver\Exception\UnexpectedValueException exception.
If an object is of a class that implements the MongoDB\BSON\Persistable interface (which implies MongoDB\BSON\Serializable), obtain the properties in a similar way as in the previous paragraphs, but also add an additional property __pclass as a Binary value, with subtype 0x80 and data bearing the fully qualified class name of the object that is being serialized.
The __pclass property is added to the array or object returned by MongoDB\BSON\Serializable::bsonSerialize(), which means it will overwrite any __pclass key/property in the MongoDB\BSON\Serializable::bsonSerialize() return value. If you want to avoid this behaviour and set your own __pclass value, you must not implement MongoDB\BSON\Persistable and should instead implement MongoDB\BSON\Serializable directly.
Examples
<?php
class stdClass {
public $foo = 42;
} // => { "foo" : 42 }
class MyClass {
public $foo = 42;
protected $prot = "wine";
private $fpr = "cheese";
} // => { "foo" : 42 }
class AnotherClass1 implements MongoDB\BSON\Serializable {
public $foo = 42;
protected $prot = "wine";
private $fpr = "cheese";
function bsonSerialize() {
return [ 'foo' => $this->foo, 'prot' => $this->prot ];
}
} // => { "foo" : 42, "prot" : "wine" }
class AnotherClass2 implements MongoDB\BSON\Serializable {
public $foo = 42;
function bsonSerialize() {
return $this;
}
} // => MongoDB\Driver\Exception\UnexpectedValueException("bsonSerialize() did not return an array or stdClass")
class AnotherClass3 implements MongoDB\BSON\Serializable {
private $elements = [ 'foo', 'bar' ];
function bsonSerialize() {
return $this->elements;
}
} // => { "0" : "foo", "1" : "bar" }
class ContainerClass implements MongoDB\BSON\Serializable {
public $things = AnotherClass4 implements MongoDB\BSON\Serializable {
private $elements = [ 0 => 'foo', 2 => 'bar' ];
function bsonSerialize() {
return $this->elements;
}
}
function bsonSerialize() {
return [ 'things' => $this->things ];
}
} // => { "things" : { "0" : "foo", "2" : "bar" } }
class ContainerClass implements MongoDB\BSON\Serializable {
public $things = AnotherClass5 implements MongoDB\BSON\Serializable {
private $elements = [ 0 => 'foo', 2 => 'bar' ];
function bsonSerialize() {
return array_values($this->elements);
}
}
function bsonSerialize() {
return [ 'things' => $this->things ];
}
} // => { "things" : [ "foo", "bar" ] }
class ContainerClass implements MongoDB\BSON\Serializable {
public $things = AnotherClass6 implements MongoDB\BSON\Serializable {
private $elements = [ 'foo', 'bar' ];
function bsonSerialize() {
return (object) $this->elements;
}
}
function bsonSerialize() {
return [ 'things' => $this->things ];
}
} // => { "things" : { "0" : "foo", "1" : "bar" } }
class UpperClass implements MongoDB\BSON\Persistable {
public $foo = 42;
protected $prot = "wine";
private $fpr = "cheese";
function bsonSerialize() {
return [ 'foo' => $this->foo, 'prot' => $this->prot ];
}
} // => { "foo" : 42, "prot" : "wine", "__pclass" : { "$type" : "80", "$binary" : "VXBwZXJDbGFzcw==" } }
English translation
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Document created the 30/01/2003, last modified the 26/10/2018
Source of the printed document:https://www.gaudry.be/en/php-rf-mongodb.persistence.serialization.html
The infobrol is a personal site whose content is my sole responsibility. The text is available under CreativeCommons license (BY-NC-SA). More info on the terms of use and the author.
References
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The author This site is solely responsible for the way in which the various concepts, and the freedoms that are taken with the reference works, are presented here. Remember that you must cross multiple source information to reduce the risk of errors.
