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>serialize</H1
><DIV
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><A
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><P
> (PHP 3>= 3.0.5, PHP 4 )</P
>serialize --
Generates a storable representation of a value
</DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN78642"
></A
><H2
>Description</H2
>string <B
CLASS="methodname"
>serialize</B
> ( mixed value)<BR
></BR
><P
> <B
CLASS="function"
>serialize()</B
> returns a string containing a
byte-stream representation of <TT
CLASS="parameter"
><I
>value</I
></TT
> that
can be stored anywhere.
</P
><P
> This is useful for storing or passing PHP values around without
losing their type and structure.
</P
><P
> To make the serialized string into a PHP value again, use
<A
HREF="function.unserialize.html"
><B
CLASS="function"
>unserialize()</B
></A
>. <B
CLASS="function"
>serialize()</B
>
handles all types, except the resource-type.
You can even <B
CLASS="function"
>serialize()</B
> arrays that contain
references to itself. References inside the array/object you
are <B
CLASS="function"
>serialize()</B
>ing will also be stored.
</P
><P
> When serializing objects, PHP will attempt to call the member function
<B
CLASS="function"
>__sleep()</B
> prior to serialization. This is to allow the
object to do any last minute clean-up, etc. prior to being serialized.
Likewise, when the object is restored using <A
HREF="function.unserialize.html"
><B
CLASS="function"
>unserialize()</B
></A
>
the <B
CLASS="function"
>__wakeup()</B
> member function is called.
</P
><DIV
CLASS="note"
><BLOCKQUOTE
CLASS="note"
><P
><B
>Nota: </B
>
In PHP 3, object properties will be serialized, but methods are
lost. PHP 4 removes that limitation and restores both properties
and methods. Please see the <A
HREF="missing-stuff.html#language.oop.serialization"
>Serializing Objects</A
>
section of <A
HREF="language.oop.html"
>Classes and
Objects</A
> for more information.
</P
></BLOCKQUOTE
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></A
><P
><B
>Ejemplo 1. <B
CLASS="function"
>serialize()</B
> example</B
></P
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><PRE
CLASS="php"
>// $session_data contains a multi-dimensional array with session
// information for the current user. We use serialize() to store
// it in a database at the end of the request.
$conn = odbc_connect ("webdb", "php", "chicken");
$stmt = odbc_prepare ($conn,
"UPDATE sessions SET data = ? WHERE id = ?");
$sqldata = array (serialize($session_data), $PHP_AUTH_USER);
if (!odbc_execute ($stmt, &$sqldata)) {
$stmt = odbc_prepare($conn,
"INSERT INTO sessions (id, data) VALUES(?, ?)");
if (!odbc_execute($stmt, &$sqldata)) {
/* Something went wrong. Bitch, whine and moan. */
}
}</PRE
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</P
><P
> See Also: <A
HREF="function.unserialize.html"
><B
CLASS="function"
>unserialize()</B
></A
>.
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