Use PHP unserialize() function to implement deserialization

Serialization is a process of converting a data structure or object into a string that is convenient for storage, transmission, or representation, and conversely, parsing a string into the original data structure or object. In PHP, we can use the serialize() function to serialize a variable into a string, and use the unserialize() function to deserialize a string into a primitive data structure or object.

This article will focus on the use and precautions of the PHP unserialize() function.

1. Syntax of unserialize() function

unserialize(string $str);

This function receives a string as a parameter and returns a parsed data structure or object. If the argument is not a string, or parsing fails, the function returns false.

2. Instance of unserialize() function

//Serialize an array into a string
$my_array = array('apple', 'banana', 'orange') ;
$serialized_array = serialize($my_array);

//Deserialize the string into the original array
$original_array = unserialize($serialized_array);

// Output the original array
print_r($original_array);

In the above example, we first create an array $my_array containing three fruit names, and then use the serialize() function to serialize the array into a character String $serialized_array. Next, we use the unserialize() function to deserialize the string into the original array $original_array, and use the print_r() function to output the array. Running the above code will output the following results in the browser:

Array
(

[0] => apple
[1] => banana
[2] => orange

)

This shows that the unserialize() function successfully deserialized $serialized_array Transformed into $original_array.

3. Things to note

You need to pay attention to the following points when using the unserialize() function:

1. The rules for serialization and deserialization need to be consistent. If custom serialization rules are used during serialization, the same rules need to be used during deserialization.
2. The deserialized string must be generated by the serialize() function, otherwise parsing errors may occur.
3. The deserialized data cannot contain control characters (ASCII code less than or equal to 31), otherwise the parsing will fail.

4. Conclusion

The PHP unserialize() function is a very powerful data parsing tool that can restore the serialized data structure or object to its original state. When using this function, you need to pay attention to the consistent rules for serialization and deserialization. The data needs to be serialized correctly, otherwise it is likely to cause parsing failure. Correct use of this function can greatly facilitate data transmission and processing and improve programming efficiency.

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