<code><a href="https://php.net/manual/en/language.types.string">string</a></code>|<code><a href="https://php.net/manual/en/language.types.resource">resource</a></code> <span class="var" id="$data">$data<a class="permalink" href="ion/unserialize#%24data">#</a></span><br>
Serialized ION data, either as <code><a href="https://php.net/manual/en/language.types.string">string</a></code> buffer or stream.</li>
<li>Optional <a href="ion/Unserializer">ion\Unserializer</a>|<code><a href="https://php.net/manual/en/language.types.array">array</a></code>|<code><a href="https://php.net/manual/en/language.types.null">null</a></code> <span class="var" id="$unserializer">$unserializer<a class="permalink" href="ion/unserialize#%24unserializer">#</a></span> = <code><a href="https://php.net/manual/en/language.types.null">NULL</a></code><br>
<code><a href="https://php.net/manual/en/language.types.string">string</a></code>|<code><a href="https://php.net/manual/en/language.types.resource">resource</a></code> <span class="var" id="$data">$data<a class="permalink" href="ion/unserialize#%24data">#</a></span><br>
Serialized ION data, either as <code><a href="https://php.net/manual/en/language.types.string">string</a></code> buffer or stream.</li>
<li>Optional <a href="ion/Unserializer">ion\Unserializer</a>|<code><a href="https://php.net/manual/en/language.types.array">array</a></code>|<code><a href="https://php.net/manual/en/language.types.null">null</a></code> <span class="var" id="$unserializer">$unserializer<a class="permalink" href="ion/unserialize#%24unserializer">#</a></span> = <code><a href="https://php.net/manual/en/language.types.null">NULL</a></code><br>