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igbinary.php
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68 lines (65 loc) · 3.26 KB
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<?php
/**
* Igbinary is a drop in replacement for the standard php serializer.
* Instead of time and space consuming textual presentation, igbinary stores php data
* structures in a compact binary form. Savings are significant when using
* memcached or similar memory based storages for serialized data.
*
* But where does the name "igbinary" come from? There was once a similar project
* called fbinary but it has disappeared from the Internet. Its architecture
* wasn't very clean either. IG is short name for a finnish social networking site
* {@link http://irc-galleria.net/ IRC-Galleria}.
*
* Storing complex php data structures like arrays of associative arrays in
* serialized form is not very space efficient. Igbinary uses two strategies to
* to minimize size of the serialized form.
*
* Strings are stored only once by using a hash table. Arrays of associate arrays
* with very verbose keys are stored very compactly.
*
* Numerical values are stored in the smallest primitive data type available.
* 123 = int8_t,
* 1234 = int16_t,
* 123456 = int32_t
* ... and so on.
*
* This file is igbinary phpdoc documentation stub.
*
* @author Oleg Grenrus <oleg.grenrus@dynamoid.com>
* @version 1.0.0
* @package igbinary
*/
/** 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 {@link igbinary_unserialize}.
*
* igbinary_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 serialize()ing will also be stored.
*
* If object implements {@link http://www.php.net/~helly/php/ext/spl/interfaceSerializable.html Serializable} -interface,
* PHP will call the member function serialize to get serialized representation of object.
*
* 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.
*
* @param mixed $value The value to be serialized.
* @return string Returns a string containing a byte-stream representation of value that can be stored anywhere.
* @link http://www.php.net/serialize PHP default serialize
*/
function igbinary_serialize($value);
/** Creates a PHP value from a stored representation.
* igbinary_unserialize() takes a single serialized variable and converts it back into a PHP value.
*
* If the variable being unserialized is an object, after successfully reconstructing the object
* PHP will automatically attempt to call the __wakeup() member function (if it exists).
* In case the passed string is not unserializeable, NULL is returned and E_WARNING is issued.
*
* @param string $str The serialized string.
* @return mixed The converted value is returned, and can be a boolean, integer, float, string, array or object.
* @link http://www.php.net/manual/en/function.unserialize.php PHP default unserialize
* @link http://www.php.net/~helly/php/ext/spl/interfaceSerializable.html Serializable
*/
function igbinary_unserialize($str);
?>