JsonSerializable
A good example on when you would use functionality like this is when working with objects.
json_encode() will take a DateTime and convert it to:
{
"date":"2013-01-31 11:14:05",
"timezone_type":3,
"timezone":"America\/Los_Angeles"
}
This is great when working with PHP, but if the Date is being read by Java. The Java date parser doesn't know what to do with that. But it does know what to do with the ISO8601 format...
<?php
date_default_timezone_set('America/Los_Angeles');
class Fruit implements JsonSerializable {
public
$type = 'Apple',
$lastEaten = null;
public function __construct() {
$this->lastEaten = new DateTime();
}
public function jsonSerialize() {
return [
'type' => $this->type,
'lastEaten' => $this->lastEaten->format(DateTime::ISO8601)
];
}
}
echo json_encode(new Fruit()); //which outputs: {"type":"Apple","lastEaten":"2013-01-31T11:17:07-0500"}
?>
JsonSerializable::jsonSerialize
(PHP 5 >= 5.4.0)
JsonSerializable::jsonSerialize — Specify data which should be serialized to JSON
Beschreibung
Serializes the object to a value that can be serialized natively by json_encode().
Parameter-Liste
Diese Funktion hat keine Parameter.
Rückgabewerte
Returns data which can be serialized by json_encode(), which is a value of any type other than a resource.
Beispiele
Beispiel #1 JsonSerializable::jsonSerialize() example returning an array
<?php
class ArrayValue implements JsonSerializable {
public function __construct(array $array) {
$this->array = $array;
}
public function jsonSerialize() {
return $this->array;
}
}
$array = [1, 2, 3];
echo json_encode(new ArrayValue($array), JSON_PRETTY_PRINT);
?>
Das oben gezeigte Beispiel erzeugt folgende Ausgabe:
[
1,
2,
3
]
Beispiel #2 JsonSerializable::jsonSerialize() example returning an associative array
<?php
class ArrayValue implements JsonSerializable {
public function __construct(array $array) {
$this->array = $array;
}
public function jsonSerialize() {
return $this->array;
}
}
$array = ['foo' => 'bar', 'quux' => 'baz'];
echo json_encode(new ArrayValue($array), JSON_PRETTY_PRINT);
?>
Das oben gezeigte Beispiel erzeugt folgende Ausgabe:
{
"foo": "bar",
"quux": "baz"
}
Beispiel #3 JsonSerializable::jsonSerialize() example returning an integer
<?php
class IntegerValue implements JsonSerializable {
public function __construct($number) {
$this->number = (integer) $number;
}
public function jsonSerialize() {
return $this->number;
}
}
echo json_encode(new IntegerValue(1), JSON_PRETTY_PRINT);
?>
Das oben gezeigte Beispiel erzeugt folgende Ausgabe:
1
Beispiel #4 JsonSerializable::jsonSerialize() example returning a string
<?php
class StringValue implements JsonSerializable {
public function __construct($string) {
$this->string = (string) $string;
}
public function jsonSerialize() {
return $this->string;
}
}
echo json_encode(new StringValue('Hello!'), JSON_PRETTY_PRINT);
?>
Das oben gezeigte Beispiel erzeugt folgende Ausgabe:
"Hello!"
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User Contributed Notes
JsonSerializable::jsonSerialize - [1 notes]
benkuhl at gmail dot com ¶
3 months ago