How to store object array in php

In PHP language, array is a very common data type that can store multiple values ​​and access each value through subscript. In addition, PHP also supports object arrays, that is, each element in the array is an object. In actual development, we often need to store object arrays in applications and perform subsequent operations. This article will introduce how PHP stores arrays of objects.

1. Serialize the object array into a string and store it

The object array can be stored by serializing it into a string, and then deserializing it into an object array when needed. PHP provides serialization and deserialization functions serialize() and unserialize().

The sample code is as follows:

// 定义一个对象
class Person {
  public $name;
  public $age;
}

// 初始化对象数组
$persons = [
  new Person('Tom', 18),
  new Person('Jerry', 20),
];

// 序列化对象数组
$serialized = serialize($persons);

// 存储到文件中
file_put_contents('persons.txt', $serialized);

// 从文件中读取并反序列化
$serialized = file_get_contents('persons.txt');
$persons = unserialize($serialized);

Serializing an object array into a string can easily store and transmit data, but there are also some problems. First of all, the serialized string cannot be viewed and modified directly, so it is more complicated to debug and maintain. Secondly, the serialized string is only suitable for storing simple object arrays. When the object array contains sub-objects or resources, the serialized string may become very large.

2. Convert the object array to JSON format and store it

Compared to serializing it into a string, converting the object array to JSON format can make it easier to view and modify the data. The JSON format is a lightweight data exchange format that supports multiple programming languages, including PHP. PHP provides json_encode() and json_decode() functions, which can convert object arrays into JSON format strings and parse object arrays from JSON format strings.

The sample code is as follows:

// 定义一个对象
class Person {
  public $name;
  public $age;
}

// 初始化对象数组
$persons = [
  new Person('Tom', 18),
  new Person('Jerry', 20),
];

// 将对象数组转换为JSON格式字符串
$json = json_encode($persons);

// 存储到文件中
file_put_contents('persons.json', $json);

// 从文件中读取并解析为对象数组
$json = file_get_contents('persons.json');
$persons = json_decode($json);

Converting the object array to JSON format can facilitate data viewing and modification, and can store complex object arrays. However, since the JSON format takes up more space than the string format, there may be certain performance issues when storing large-scale object arrays.

3. Convert object array to serialized binary stream and store

msgpack extension in PHP provides a method to serialize object array into binary stream , this method can reduce storage space when storing object arrays, and can also improve the efficiency of data transmission and parsing. Here we introduce how to use msgpack to expand the storage object array.

First, you need to make sure that PHP has the msgpack extension installed. Then, you can use the msgpack_pack() and msgpack_unpack() functions to serialize the object array into a binary stream and parse the object array from the binary stream, respectively.

The sample code is as follows:

// 定义一个对象
class Person {
  public $name;
  public $age;
}

// 初始化对象数组
$persons = [
  new Person('Tom', 18),
  new Person('Jerry', 20),
];

// 将对象数组序列化为二进制流
$packed = msgpack_pack($persons);

// 存储到文件中
file_put_contents('persons.bin', $packed);

// 从文件中读取并解析为对象数组
$packed = file_get_contents('persons.bin');
$persons = msgpack_unpack($packed);

Serializing the object array into a binary stream can optimize storage space and is more efficient during data transmission and parsing. However, because the binary stream is inconvenient to view and modify, there may be certain difficulties in debugging and maintenance.

Conclusion

This article introduces three methods for PHP to store object arrays, which are serialization into strings, conversion into JSON format, and serialization into binary streams. According to different business needs and data characteristics, choosing different storage methods will help optimize storage space, improve data transmission efficiency, and also facilitate program development and maintenance.

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