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PHP Object Serialization

Serialize / Unserialize


serialize() returns a string containing a byte-stream representation of any value that can be stored in PHP. unserialize() can use this string to recreate the original variable values.
To serialize an object

serialize($object);

To Unserialize an object

unserialize($object)

Example

$array = array();
$array["a"] = "Foo";
$array["b"] = "Bar";
$array["c"] = "Baz";
$array["d"] = "Wom";

$serializedArray = serialize($array);
echo $serializedArray;

Output

a:4:{s:1:"a";s:3:"Foo";s:1:"b";s:3:"Bar";s:1:"c";s:3:"Baz";s:1:"d";s:3:"Wom";}

The Serializable interface


Introduction
Classes that implement this interface no longer support __sleep() and __wakeup(). The method serialize is called whenever an instance needs to be serialized. This does not invoke __destruct() or has any other side effect unless programmed inside the method. When the data is unserialized the class is known and the appropriate unserialize() method is called as a constructor instead of calling __construct(). If you need to execute the standard constructor you may do so in the method.

Basic usage



class obj implements Serializable {
 private $data;
 public function __construct() {
 $this->data = "My private data";
 }
 public function serialize() {
 return serialize($this->data);
 }
 public function unserialize($data) {
 $this->data = unserialize($data);
 }
 public function getData() {
 return $this->data;
 }
}

$obj = new obj;
$ser = serialize($obj);
var_dump($ser);

Output

string(38) "C:3:"obj":23:{s:15:"My private data";}"

$newobj = unserialize($ser);
var_dump($newobj->getData());

Output

string(15) "My private data"


Conclusion

In this page (written and validated by ) you learned about PHP Object Serialization . What's Next? If you are interested in completing PHP tutorial, your next topic will be learning about: PHP Reading raw POST data.



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