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PHP serialize

PHP original manual for serialize [ show | php.net ]

serialize

(PHP 4, PHP 5, PHP 7)

serialize — Generates a storable representation of a value

Description

string serialize ( mixed $value )

Generates a storable representation of a value.

This is useful for storing or passing PHP values around without losing their type and structure.

To make the serialized string into a PHP value again, use unserialize().

Parameters

value

The value to be serialized. serialize() handles all types, except the resource-type. You can even serialize() arrays that contain references to itself. Circular references inside the array/object you are serializing will also be stored. Any other reference will be lost.

When serializing objects, PHP will attempt to call the member function __sleep() 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 unserialize() the __wakeup() member function is called.

Note:

Object's private members have the class name prepended to the member name; protected members have a '*' prepended to the member name. These prepended values have null bytes on either side.

Return Values

Returns a string containing a byte-stream representation of value that can be stored anywhere.

Note that this is a binary string which may include null bytes, and needs to be stored and handled as such. For example, serialize() output should generally be stored in a BLOB field in a database, rather than a CHAR or TEXT field.

Examples

Example #1 serialize() example

<?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), $_SERVER['PHP_AUTH_USER']);
if (!odbc_execute($stmt, $sqldata)) {
    $stmt = odbc_prepare($conn,
     "INSERT INTO sessions (id, data) VALUES(?, ?)");
    if (!odbc_execute($stmt, $sqldata)) {
        /* Something went wrong.. */
    }
}
?>

Notes

Note:

Note that many built-in PHP objects cannot be serialized. However, those with this ability either implement the Serializable interface or the magic __sleep() and __wakeup() methods. If an internal class does not fulfill any of those requirements, it cannot reliably be serialized.

There are some historical exceptions to the above rule, where some internal objects could be serialized without implementing the interface or exposing the methods. Notably, the ArrayObject prior to PHP 5.2.0.

Warning

When serialize() serializes objects, the leading backslash is not included in the class name of namespaced classes for maximum compatibility.

See Also