php-doc-en/reference/json/jsonserializable/jsonserialize.xml

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<refentry xml:id="jsonserializable.jsonserialize" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
 <refnamediv>
  <refname>JsonSerializable::jsonSerialize</refname>
  <refpurpose>Specify data which should be serialized to JSON</refpurpose>
 </refnamediv>

 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <modifier>public</modifier> <type>mixed</type><methodname>JsonSerializable::jsonSerialize</methodname>
   <void/>
  </methodsynopsis>
  <para>
   Serializes the object to a value that can be serialized natively by
   <function>json_encode</function>.
  </para>
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  &no.function.parameters;
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   Returns data which can be serialized by <function>json_encode</function>,
   which is a value of any type other than a &resource;.
  </para>
 </refsect1>

 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title>
     <methodname>JsonSerializable::jsonSerialize</methodname> example
     returning an &array;
    </title>
    <programlisting role="php">
<![CDATA[
<?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);
?>
]]>
    </programlisting>
    &example.outputs;
    <screen>
<![CDATA[
[
    1,
    2,
    3
]
]]>
    </screen>
   </example>
   <example>
    <title>
     <methodname>JsonSerializable::jsonSerialize</methodname> example
     returning an associative &array;
    </title>
    <programlisting role="php">
<![CDATA[
<?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);
?>
]]>
    </programlisting>
    &example.outputs;
    <screen>
<![CDATA[
{
    "foo": "bar",
    "quux": "baz"
}
]]>
    </screen>
   </example>
   <example>
    <title>
     <methodname>JsonSerializable::jsonSerialize</methodname> example
     returning an &integer;
    </title>
    <programlisting role="php">
<![CDATA[
<?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);
?>
]]>
    </programlisting>
    &example.outputs;
    <screen>
<![CDATA[
1
]]>
    </screen>
   </example>
   <example>
    <title>
     <methodname>JsonSerializable::jsonSerialize</methodname> example
     returning a &string;
    </title>
    <programlisting role="php">
<![CDATA[
<?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);
?>
]]>
    </programlisting>
    &example.outputs;
    <screen>
<![CDATA[
"Hello!"
]]>
    </screen>
   </example>
  </para>
 </refsect1>
</refentry>
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