How to convert array object into object array in php

In PHP development, arrays and objects are two different data structures. Although they can both store multiple data, they have different usage methods and characteristics. In actual development, it is often necessary to convert array objects into arrays of array objects to facilitate data processing and use. This article will introduce how to convert PHP array objects into object arrays.

1. What is an array object

In PHP, we can use arrays and objects to store data. An array is an ordered set of key-value pairs, and the elements in the array can be accessed through subscripts, while an object is an instantiated class, and the data and functions in the object can be accessed through properties and methods. However, in some cases, we need to store the properties of an object in an array, that is, an array object.

Sample code:

// 定义一个数组对象
$person = array(
  "name" => "Tom",
  "age" => 18,
  "gender" => "男"
);

// 使用对象的方式访问数组对象中的属性
echo $person["name"]; // 输出 Tom

// 使用数组的方式访问数组对象中的属性
echo $person->name; // 输出 Tom

2. What is an array object array

An array object array refers to an array containing multiple array objects. Each array object contains the same Property structure. In practical applications, array object arrays can be used to store multiple pieces of data in the same format to facilitate processing and display.

Sample code:

// 定义一个数组对象数组
$students = array(
  array(
    "name" => "Tom",
    "age" => 18,
    "gender" => "男"
  ),
  array(
    "name" => "Jane",
    "age" => 20,
    "gender" => "女"
  )
);

// 使用对象的方式访问数组对象数组中的属性
echo $students[0]["name"]; // 输出 Tom

// 使用数组的方式访问数组对象数组中的属性
echo $students[1]->name; // 输出 Jane

3. Convert an array object into an array of array objects

The method of converting an array object into an array of array objects is very simple, just traverse the array object , store the properties of each object in an array, and then add these arrays to a new array.

Sample code:

// 定义一个数组对象
$person1 = array(
  "name" => "Tom",
  "age" => 18,
  "gender" => "男"
);

// 定义另一个数组对象
$person2 = array(
  "name" => "Jane",
  "age" => 20,
  "gender" => "女"
);

// 将数组对象转成数组对象数组
$students = array();
array_push($students, (array)$person1);
array_push($students, (array)$person2);

// 输出数组对象数组中的属性
echo $students[0]["name"]; // 输出 Tom
echo $students[1]["gender"]; // 输出 女

Through the above code, we can convert two array objects into an array of array objects. It should be noted that when converting an array object into an array of array objects, each object needs to be forced into an array. Otherwise, special symbols of the object will appear and cannot be accessed normally using the array method.

4. Convert an array of array objects into a JSON string

In actual development, it is often necessary to convert an array of array objects into a JSON string to facilitate transmission and storage. PHP provides a function json_encode() that can convert an array object or an array of array objects into a string in JSON format.

Sample code:

// 将数组对象数组转成 JSON 字符串
$jsonStr = json_encode($students);

// 输出 JSON 字符串
echo $jsonStr;

Through the above code, we can convert the array object array into a JSON string. In actual development, the JSON string can be stored in the database, or via HTTP The request method is transmitted to the front end for processing.

Summary

This article introduces the concepts of PHP array objects and array objects, and how to convert array objects into array objects and convert array objects into JSON strings. In development, different data structures have different usage methods and characteristics. Proper use of data structures can improve code efficiency and reduce errors. In actual development, you can choose to use different data structures according to your needs to achieve optimal processing results.

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