Detailed explanation of PHP serialization and deserialization

The so-called serialization is to convert the data of a variable into a string (but it is different from type conversion). The purpose is to store this string (as a text file) so that it can be deserialized and restored when run on other environments. (Generally used where data needs to be stored)

Serialization:

$str=serialize($variable)//Convert the data to a string and store it in the variable $ str.

file_put_conetents("Text file path",$str);//Save the file in the text file.

Deserialization:

$str=file_get_contents("Text file path");//Get the serialized information stored in the file.

$value=unserialize($str); //Convert the retrieved string content into normal data and store it in $value.

Magic methods during serialization and deserialization:

__sleep(): When serializing an object of a certain class, it will automatically call the __sleep() method;

Use this method to select the data that needs to be serialized, select the required attributes, and store them in the array. The array will be returned after the end. The value of is what is to be serialized.

__wakeup(): Just the opposite of __sleep(). When called during deserialization, some useful operations can be performed to return the state to the state before serialization (such as database connection ). Because serialization only changes the required attributes into strings and stores them, and deserialization only changes the strings back into data, but some states do not return to the previous state. At this time, you can use __wakeup() to perform the operation. , back to exactly the same state as before.

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