<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="content-type" content="text/html; charset=UTF-8"> <title>Specify data which should be serialized to JSON</title> </head> <body><div class="manualnavbar" style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="class.jsonserializable.html">JsonSerializable</a></div> <div class="next" style="text-align: right; float: right;"><a href="ref.json.html">JSON Functions</a></div> <div class="up"><a href="class.jsonserializable.html">JsonSerializable</a></div> <div class="home"><a href="index.html">PHP Manual</a></div> </div><hr /><div id="jsonserializable.jsonserialize" class="refentry"> <div class="refnamediv"> <h1 class="refname">JsonSerializable::jsonSerialize</h1> <p class="verinfo">(PHP 5 >= 5.4.0)</p><p class="refpurpose"><span class="refname">JsonSerializable::jsonSerialize</span> — <span class="dc-title">Specify data which should be serialized to JSON</span></p> </div> <div class="refsect1 description" id="refsect1-jsonserializable.jsonserialize-description"> <h3 class="title">Description</h3> <div class="methodsynopsis dc-description"> <span class="modifier">abstract</span> <span class="modifier">public</span> <span class="type"><a href="language.pseudo-types.html#language.types.mixed" class="type mixed">mixed</a></span> <span class="methodname"><strong>JsonSerializable::jsonSerialize</strong></span> ( <span class="methodparam">void</span> )</div> <p class="para rdfs-comment"> Serializes the object to a value that can be serialized natively by <span class="function"><a href="function.json-encode.html" class="function">json_encode()</a></span>. </p> </div> <div class="refsect1 parameters" id="refsect1-jsonserializable.jsonserialize-parameters"> <h3 class="title">Parameters</h3> <p class="para">This function has no parameters.</p> </div> <div class="refsect1 returnvalues" id="refsect1-jsonserializable.jsonserialize-returnvalues"> <h3 class="title">Return Values</h3> <p class="para"> Returns data which can be serialized by <span class="function"><a href="function.json-encode.html" class="function">json_encode()</a></span>, which is a value of any type other than a <span class="type"><a href="language.types.resource.html" class="type resource">resource</a></span>. </p> </div> <div class="refsect1 examples" id="refsect1-jsonserializable.jsonserialize-examples"> <h3 class="title">Examples</h3> <p class="para"> <div class="example" id="example-3751"> <p><strong>Example #1 <span class="methodname"><strong>JsonSerializable::jsonSerialize()</strong></span> example returning an <span class="type"><a href="language.types.array.html" class="type array">array</a></span> </strong></p> <div class="example-contents"> <div class="phpcode"><code><span style="color: #000000"> <span style="color: #0000BB"><?php<br /></span><span style="color: #007700">class </span><span style="color: #0000BB">ArrayValue </span><span style="color: #007700">implements </span><span style="color: #0000BB">JsonSerializable </span><span style="color: #007700">{<br /> public function </span><span style="color: #0000BB">__construct</span><span style="color: #007700">(array </span><span style="color: #0000BB">$array</span><span style="color: #007700">) {<br /> </span><span style="color: #0000BB">$this</span><span style="color: #007700">-></span><span style="color: #0000BB">array </span><span style="color: #007700">= </span><span style="color: #0000BB">$array</span><span style="color: #007700">;<br /> }<br /><br /> public function </span><span style="color: #0000BB">jsonSerialize</span><span style="color: #007700">() {<br /> return </span><span style="color: #0000BB">$this</span><span style="color: #007700">-></span><span style="color: #0000BB">array</span><span style="color: #007700">;<br /> }<br />}<br /><br /></span><span style="color: #0000BB">$array </span><span style="color: #007700">= [</span><span style="color: #0000BB">1</span><span style="color: #007700">, </span><span style="color: #0000BB">2</span><span style="color: #007700">, </span><span style="color: #0000BB">3</span><span style="color: #007700">];<br />echo </span><span style="color: #0000BB">json_encode</span><span style="color: #007700">(new </span><span style="color: #0000BB">ArrayValue</span><span style="color: #007700">(</span><span style="color: #0000BB">$array</span><span style="color: #007700">), </span><span style="color: #0000BB">JSON_PRETTY_PRINT</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">?></span> </span> </code></div> </div> <div class="example-contents"><p>The above example will output:</p></div> <div class="example-contents screen"> <div class="cdata"><pre> [ 1, 2, 3 ] </pre></div> </div> </div> <div class="example" id="example-3752"> <p><strong>Example #2 <span class="methodname"><strong>JsonSerializable::jsonSerialize()</strong></span> example returning an associative <span class="type"><a href="language.types.array.html" class="type array">array</a></span> </strong></p> <div class="example-contents"> <div class="phpcode"><code><span style="color: #000000"> <span style="color: #0000BB"><?php<br /></span><span style="color: #007700">class </span><span style="color: #0000BB">ArrayValue </span><span style="color: #007700">implements </span><span style="color: #0000BB">JsonSerializable </span><span style="color: #007700">{<br /> public function </span><span style="color: #0000BB">__construct</span><span style="color: #007700">(array </span><span style="color: #0000BB">$array</span><span style="color: #007700">) {<br /> </span><span style="color: #0000BB">$this</span><span style="color: #007700">-></span><span style="color: #0000BB">array </span><span style="color: #007700">= </span><span style="color: #0000BB">$array</span><span style="color: #007700">;<br /> }<br /><br /> public function </span><span style="color: #0000BB">jsonSerialize</span><span style="color: #007700">() {<br /> return </span><span style="color: #0000BB">$this</span><span style="color: #007700">-></span><span style="color: #0000BB">array</span><span style="color: #007700">;<br /> }<br />}<br /><br /></span><span style="color: #0000BB">$array </span><span style="color: #007700">= [</span><span style="color: #DD0000">'foo' </span><span style="color: #007700">=> </span><span style="color: #DD0000">'bar'</span><span style="color: #007700">, </span><span style="color: #DD0000">'quux' </span><span style="color: #007700">=> </span><span style="color: #DD0000">'baz'</span><span style="color: #007700">];<br />echo </span><span style="color: #0000BB">json_encode</span><span style="color: #007700">(new </span><span style="color: #0000BB">ArrayValue</span><span style="color: #007700">(</span><span style="color: #0000BB">$array</span><span style="color: #007700">), </span><span style="color: #0000BB">JSON_PRETTY_PRINT</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">?></span> </span> </code></div> </div> <div class="example-contents"><p>The above example will output:</p></div> <div class="example-contents screen"> <div class="cdata"><pre> { "foo": "bar", "quux": "baz" } </pre></div> </div> </div> <div class="example" id="example-3753"> <p><strong>Example #3 <span class="methodname"><strong>JsonSerializable::jsonSerialize()</strong></span> example returning an <span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span> </strong></p> <div class="example-contents"> <div class="phpcode"><code><span style="color: #000000"> <span style="color: #0000BB"><?php<br /></span><span style="color: #007700">class </span><span style="color: #0000BB">IntegerValue </span><span style="color: #007700">implements </span><span style="color: #0000BB">JsonSerializable </span><span style="color: #007700">{<br /> public function </span><span style="color: #0000BB">__construct</span><span style="color: #007700">(</span><span style="color: #0000BB">$number</span><span style="color: #007700">) {<br /> </span><span style="color: #0000BB">$this</span><span style="color: #007700">-></span><span style="color: #0000BB">number </span><span style="color: #007700">= (integer) </span><span style="color: #0000BB">$number</span><span style="color: #007700">;<br /> }<br /><br /> public function </span><span style="color: #0000BB">jsonSerialize</span><span style="color: #007700">() {<br /> return </span><span style="color: #0000BB">$this</span><span style="color: #007700">-></span><span style="color: #0000BB">number</span><span style="color: #007700">;<br /> }<br />}<br /><br />echo </span><span style="color: #0000BB">json_encode</span><span style="color: #007700">(new </span><span style="color: #0000BB">IntegerValue</span><span style="color: #007700">(</span><span style="color: #0000BB">1</span><span style="color: #007700">), </span><span style="color: #0000BB">JSON_PRETTY_PRINT</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">?></span> </span> </code></div> </div> <div class="example-contents"><p>The above example will output:</p></div> <div class="example-contents screen"> <div class="cdata"><pre> 1 </pre></div> </div> </div> <div class="example" id="example-3754"> <p><strong>Example #4 <span class="methodname"><strong>JsonSerializable::jsonSerialize()</strong></span> example returning a <span class="type"><a href="language.types.string.html" class="type string">string</a></span> </strong></p> <div class="example-contents"> <div class="phpcode"><code><span style="color: #000000"> <span style="color: #0000BB"><?php<br /></span><span style="color: #007700">class </span><span style="color: #0000BB">StringValue </span><span style="color: #007700">implements </span><span style="color: #0000BB">JsonSerializable </span><span style="color: #007700">{<br /> public function </span><span style="color: #0000BB">__construct</span><span style="color: #007700">(</span><span style="color: #0000BB">$string</span><span style="color: #007700">) {<br /> </span><span style="color: #0000BB">$this</span><span style="color: #007700">-></span><span style="color: #0000BB">string </span><span style="color: #007700">= (string) </span><span style="color: #0000BB">$string</span><span style="color: #007700">;<br /> }<br /><br /> public function </span><span style="color: #0000BB">jsonSerialize</span><span style="color: #007700">() {<br /> return </span><span style="color: #0000BB">$this</span><span style="color: #007700">-></span><span style="color: #0000BB">string</span><span style="color: #007700">;<br /> }<br />}<br /><br />echo </span><span style="color: #0000BB">json_encode</span><span style="color: #007700">(new </span><span style="color: #0000BB">StringValue</span><span style="color: #007700">(</span><span style="color: #DD0000">'Hello!'</span><span style="color: #007700">), </span><span style="color: #0000BB">JSON_PRETTY_PRINT</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">?></span> </span> </code></div> </div> <div class="example-contents"><p>The above example will output:</p></div> <div class="example-contents screen"> <div class="cdata"><pre> "Hello!" </pre></div> </div> </div> </p> </div> </div><hr /><div class="manualnavbar" style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="class.jsonserializable.html">JsonSerializable</a></div> <div class="next" style="text-align: right; float: right;"><a href="ref.json.html">JSON Functions</a></div> <div class="up"><a href="class.jsonserializable.html">JsonSerializable</a></div> <div class="home"><a href="index.html">PHP Manual</a></div> </div></body></html>