


PHP object-oriented - detailed code explanation of object serialization serialize(), __sleep(), __wakeup()
Sometimes it is necessary to upload an object to the network for transmission. In order to facilitate transmission, the entire object can be converted into a binary string, and then restored to the original when it reaches the other end. Object, this process is called serialization (also called serialization), just like we now want to transport a car to the United States by ship, because the car is relatively large, we can dismantle the car into smaller ones parts, and then we ship these parts to the United States by wheel, and then assemble these parts back into the car. Generally speaking, serialization is a method of converting the "memory" data represented by a
variable into a "string" data form and persisting it on the hard disk; while deserialization It's a reverse process. There are two situations where we must serialize objects. The first situation is to serialize an object when transmitting it over the network. The second situation is to write the object to a file or database. Serialization is sometimes used.
There are two processes in serialization. One is serialization, which is to convert the object into a binary string. We use the serialize() function to serialize an object, and the other is deserialization (also called Deserialization) is to convert the binary string converted from the object into an object. We use the unserialize() function to deserialize an object.
The parameter of the serialize() function in PHP is the object name, and the return value is a string. The string returned by Serialize() has ambiguous meaning. Generally, we will not parse this string to get the object information. We only need to return This string can be transmitted to the other end of the network or saved to a file.
The unserialize() function in PHP is used to deserialize objects. The parameter of this function is the return value of the serialize() function. The output is of course the reorganized object.
Serialization of objects:
- Serializing an object can only "save" its attribute data, and the method is Ignore (method is not data)
- When an object is serialized, the magic method of the class to which the object belongs is automatically called: sleep()
Deserialization of objects:
- Deserializing an object is actually the attribute data originally saved during the recovery period, and you must rely on it at this time. The object's original class.
- When an object is deserialized, the magic method of the class to which the object belongs is automatically called: wakeup()
All serialization
##1.serialize(object name) Serialize the specified class object $str=serialize($per) //Serialize the per object and return the result to $str
Serialization method:
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2.unserialize (return value after serialization) Deserialization, the return result is an object $per=unserialize($str);
Deserialization practice:
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Partial serialization
1.sleep() Serialize a certain Some properties of the object.
2.wakeup() When deserializing, initialize (actually modify) the object content
In PHP5 The two magic methods sleep() method and wakeup() method. When the object is serialized, a sleep() method will be called to complete some things before going to bed; and when it wakes up again, it will re-form a binary string. object, another PHP function wakeup() will be automatically called to do some actions that the object will do when it wakes up. The sleep() function does not accept any parameters, but returns anarray
containing the attributes that need to be serialized. Attributes that are not included will be ignored during serialization. If there is no sleep() method, PHP will save all attributes.
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