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><H1
><A
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></A
>unserialize</H1
><DIV
CLASS="refnamediv"
><A
NAME="AEN230485"
></A
><P
> (PHP 3 >= 3.0.5, PHP 4, PHP 5)</P
>unserialize --
Creates a PHP value from a stored representation
</DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN230488"
></A
><H2
>Description</H2
>mixed <B
CLASS="methodname"
>unserialize</B
> ( string str )<BR
></BR
><P
> <B
CLASS="function"
>unserialize()</B
> takes a single serialized
variable (see <A
HREF="function.serialize.html"
><B
CLASS="function"
>serialize()</B
></A
>) and converts it
back into a PHP value. The converted value is returned, and can
be a <A
HREF="language.types.boolean.html"
><B
CLASS="type"
>boolean</B
></A
>, <A
HREF="language.types.integer.html"
><B
CLASS="type"
>integer</B
></A
>, <A
HREF="language.types.float.html"
><B
CLASS="type"
>float</B
></A
>,
<A
HREF="language.types.string.html"
><B
CLASS="type"
>string</B
></A
>, <A
HREF="language.types.array.html"
><B
CLASS="type"
>array</B
></A
> or <A
HREF="language.types.object.html"
><B
CLASS="type"
>object</B
></A
>.
In case the passed string is not unserializeable, <TT
CLASS="constant"
><B
>FALSE</B
></TT
> is returned and
<TT
CLASS="literal"
>E_NOTICE</TT
> is issued.
</P
><DIV
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><P
></P
><TABLE
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><TR
><TD
ALIGN="CENTER"
><B
>Atenção</B
></TD
></TR
><TR
><TD
ALIGN="LEFT"
><P
> <TT
CLASS="constant"
><B
>FALSE</B
></TT
> is returned both in the case of an error and if unserializing
the serialized <TT
CLASS="constant"
><B
>FALSE</B
></TT
> value. It is possible to catch this special case by
comparing <CODE
CLASS="parameter"
>str</CODE
> with
<TT
CLASS="literal"
>serialize(false)</TT
> or by catching the issued
<TT
CLASS="literal"
>E_NOTICE</TT
>.
</P
></TD
></TR
></TABLE
></DIV
><DIV
CLASS="note"
><BLOCKQUOTE
CLASS="note"
><P
><B
>unserialize_callback_func directive: </B
>
It's possible to set a callback-function which will be called,
if an undefined class should be instantiated during unserializing.
(to prevent getting an incomplete <A
HREF="language.types.object.html"
><B
CLASS="type"
>object</B
></A
> "__PHP_Incomplete_Class".)
Use your <TT
CLASS="filename"
>php.ini</TT
>, <A
HREF="function.ini-set.html"
><B
CLASS="function"
>ini_set()</B
></A
> or <TT
CLASS="filename"
>.htaccess</TT
>
to define 'unserialize_callback_func'. Everytime an undefined class
should be instantiated, it'll be called. To disable this feature just
empty this setting. Also note that the directive
unserialize_callback_func directive became
available in PHP 4.2.0.
</P
></BLOCKQUOTE
></DIV
><P
> If the variable being unserialized is an object, after successfully
reconstructing the object PHP will automatically attempt to call the
<B
CLASS="function"
>__wakeup()</B
> member function (if it exists).
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><TR
><TD
><DIV
CLASS="example"
><A
NAME="AEN230523"
></A
><P
><B
>Exemplo 1. unserialize_callback_func example</B
></P
><TABLE
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><TD
><code><font color="#000000">
<font color="#0000BB"><?php<br />$serialized_object</font><font color="#007700">=</font><font color="#DD0000">'O:1:"a":1:{s:5:"value";s:3:"100";}'</font><font color="#007700">;<br /><br /></font><font color="#FF8000">// unserialize_callback_func directive available as of PHP 4.2.0<br /></font><font color="#0000BB">ini_set</font><font color="#007700">(</font><font color="#DD0000">'unserialize_callback_func'</font><font color="#007700">, </font><font color="#DD0000">'mycallback'</font><font color="#007700">); </font><font color="#FF8000">// set your callback_function<br /><br /></font><font color="#007700">function </font><font color="#0000BB">mycallback</font><font color="#007700">(</font><font color="#0000BB">$classname</font><font color="#007700">) <br />{<br /> </font><font color="#FF8000">// just include a file containing your classdefinition<br /> // you get $classname to figure out which classdefinition is required<br /></font><font color="#007700">}<br /></font><font color="#0000BB">?></font>
</font>
</code></TD
></TR
></TABLE
></DIV
></TD
></TR
></TABLE
>
</P
><DIV
CLASS="note"
><BLOCKQUOTE
CLASS="note"
><P
><B
>Nota: </B
>
In PHP 3, methods are not preserved when unserializing a
serialized object. That limitation was removed in PHP 4 as both
properties and methods are now restored. Please see the <A
HREF="language.oop.serialization.html"
>Serializing Objects</A
>
section of <A
HREF="language.oop.html"
>Classes and
Objects</A
> or more information.
</P
></BLOCKQUOTE
></DIV
><P
> <TABLE
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CLASS="EXAMPLE"
><TR
><TD
><DIV
CLASS="example"
><A
NAME="AEN230531"
></A
><P
><B
>Exemplo 2. <B
CLASS="function"
>unserialize()</B
> example</B
></P
><TABLE
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><TR
><TD
><code><font color="#000000">
<font color="#0000BB"><?php<br /></font><font color="#FF8000">// Here, we use unserialize() to load session data to the<br />// $session_data array from the string selected from a database.<br />// This example complements the one described with serialize().<br /><br /></font><font color="#0000BB">$conn </font><font color="#007700">= </font><font color="#0000BB">odbc_connect</font><font color="#007700">(</font><font color="#DD0000">"webdb"</font><font color="#007700">, </font><font color="#DD0000">"php"</font><font color="#007700">, </font><font color="#DD0000">"chicken"</font><font color="#007700">);<br /></font><font color="#0000BB">$stmt </font><font color="#007700">= </font><font color="#0000BB">odbc_prepare</font><font color="#007700">(</font><font color="#0000BB">$conn</font><font color="#007700">, </font><font color="#DD0000">"SELECT data FROM sessions WHERE id = ?"</font><font color="#007700">);<br /></font><font color="#0000BB">$sqldata </font><font color="#007700">= array (</font><font color="#0000BB">$PHP_AUTH_USER</font><font color="#007700">);<br />if (!</font><font color="#0000BB">odbc_execute</font><font color="#007700">(</font><font color="#0000BB">$stmt</font><font color="#007700">, &</font><font color="#0000BB">$sqldata</font><font color="#007700">) || !</font><font color="#0000BB">odbc_fetch_into</font><font color="#007700">(</font><font color="#0000BB">$stmt</font><font color="#007700">, &</font><font color="#0000BB">$tmp</font><font color="#007700">)) {<br /> </font><font color="#FF8000">// if the execute or fetch fails, initialize to empty array<br /> </font><font color="#0000BB">$session_data </font><font color="#007700">= array();<br />} else {<br /> </font><font color="#FF8000">// we should now have the serialized data in $tmp[0].<br /> </font><font color="#0000BB">$session_data </font><font color="#007700">= </font><font color="#0000BB">unserialize</font><font color="#007700">(</font><font color="#0000BB">$tmp</font><font color="#007700">[</font><font color="#0000BB">0</font><font color="#007700">]);<br /> if (!</font><font color="#0000BB">is_array</font><font color="#007700">(</font><font color="#0000BB">$session_data</font><font color="#007700">)) {<br /> </font><font color="#FF8000">// something went wrong, initialize to empty array<br /> </font><font color="#0000BB">$session_data </font><font color="#007700">= array();<br /> }<br />}<br /></font><font color="#0000BB">?></font>
</font>
</code></TD
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></DIV
></TD
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>
</P
><P
> See also <A
HREF="function.serialize.html"
><B
CLASS="function"
>serialize()</B
></A
>.
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