How to convert object array in PHP
In PHP development, an object array usually refers to a collection of objects containing different attributes and data. These objects can be instances defined as classes, or result sets returned from database query statements. In some cases, we need to convert these object arrays into ordinary arrays for easier operation and transmission. This article will introduce in detail how PHP implements the conversion of object arrays.
1. Object array in PHP
In PHP, the implementation of object array can be diversified. Let’s give an example.
- Array object
Array object is an object type variable defined as an array. There is no class relationship between these objects. For example, below we define an array object:
$user1 = array( 'id' => 1, 'username' => 'user1', 'email' => 'user1@example.com' ); $user2 = array( 'id' => 2, 'username' => 'user2', 'email' => 'user2@example.com' ); $users = array($user1, $user2);
In the above code, we define two array objects $user1 and $user2 respectively, and use the array() function to include them in an array $users middle.
- Class object
Class object is an object that defines a class. These objects have an inheritance relationship with the class and can use the properties and methods of the class. For example, below we define a User class and create several objects of this class:
class User { public $id; public $username; public $email; public function __construct($id, $username, $email) { $this->id = $id; $this->username = $username; $this->email = $email; } } $user1 = new User(1, 'user1', 'user1@example.com'); $user2 = new User(2, 'user2', 'user2@example.com'); $users = array($user1, $user2);
In the above code, we define a User class and use the __construct() function to create $user1 and $user2 two objects of this class and use the array() function to include them in an array $users.
- Database result set object
The database result set object is the data result obtained from the database using a query statement. The result is an array of similar objects. For example, below we use the mysqli method to query the database and obtain the result set object:
$conn = new mysqli($servername, $username, $password, $dbname); $sql = "SELECT * FROM users"; $result = $conn->query($sql); $users = array(); if ($result->num_rows > 0) { while($row = $result->fetch_assoc()) { $user = new User($row["id"], $row["username"], $row["email"]); array_push($users, $user); } }
In the above code, we use the mysqli method to query the database and assign the returned result set object to the $result variable , and then we use a while loop to convert the query results into an object array of User class.
2. Convert object array to ordinary array
In some cases, we need to convert object array to ordinary array to facilitate operation and transmission. PHP comes with many functions to implement this process, we will introduce them one by one.
- Use the json_encode function to convert
The json_encode function is a function that comes with PHP. It can convert arrays, objects and other data types into JSON format data. Here, we can get the ordinary array we want by converting the object array into JSON format data, and then converting the JSON data into an array. The following is an example:
$json_users = json_encode($users); //将对象数组转换为JSON格式数据 $users_arr = json_decode($json_users, true); //将JSON格式数据转换为数组
In the above code, we use the json_encode function to convert the object array $users into JSON format data and assign it to the $json_users variable. Next, we use the json_decode function to convert the JSON format data in the $json_users variable into an associative array and assign it to the $users_arr variable. In this way, the $users_arr variable holds the ordinary array form of the object array $users.
- Use foreach loop conversion
The foreach loop can help us operate on each element in the array, and it can also help us convert an object array into a normal array.
$users_arr = array(); foreach($users as $user) { $user_arr = array( 'id' => $user->id, 'username' => $user->username, 'email' => $user->email ); array_push($users_arr, $user_arr); }
In the above code, we traverse each element in the $users object array through a foreach loop, save its attributes and data in an associative array $user_arr, and use the array_push function to push each $user_arr The array is added to the $users_arr array. Ultimately, the $users_arr array is an ordinary array that contains all the data in the $users object array.
- Use the array_map function to convert
The array_map function is a function that comes with PHP. It will apply the specified function to each element of the array and return a new array. The following is an example:
function obj_to_arr($obj) { $result = array(); foreach ($obj as $key => $val) { if (is_object($val)) { $result[$key] = obj_to_arr($val); } else { $result[$key] = $val; } } return $result; } $users_arr = array_map('obj_to_arr', $users);
In the above code, we first define a function obj_to_arr to convert the object into an array. This function applies the specified object to each element in the array and returns a new array. Finally, we use the array_map function to apply the obj_to_arr function to each element in the $users object array and assign the result to the $users_arr array.
3. Summary
In PHP development, object array is one of the common data types, and processing and operating it is an indispensable part of the development process. In this article, we introduce in detail how to define object arrays in PHP and provide three ways to convert them into ordinary arrays. The above methods are very simple and easy to understand, and I hope they can be helpful to PHP developers.
The above is the detailed content of How to convert object array in PHP. For more information, please follow other related articles on the PHP Chinese website!

Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Article

Hot Tools

Notepad++7.3.1
Easy-to-use and free code editor

SublimeText3 Chinese version
Chinese version, very easy to use

Zend Studio 13.0.1
Powerful PHP integrated development environment

Dreamweaver CS6
Visual web development tools

SublimeText3 Mac version
God-level code editing software (SublimeText3)

Hot Topics



PHP 8's JIT compilation enhances performance by compiling frequently executed code into machine code, benefiting applications with heavy computations and reducing execution times.

The article discusses OWASP Top 10 vulnerabilities in PHP and mitigation strategies. Key issues include injection, broken authentication, and XSS, with recommended tools for monitoring and securing PHP applications.

The article discusses securing PHP file uploads to prevent vulnerabilities like code injection. It focuses on file type validation, secure storage, and error handling to enhance application security.

The article discusses symmetric and asymmetric encryption in PHP, comparing their suitability, performance, and security differences. Symmetric encryption is faster and suited for bulk data, while asymmetric is used for secure key exchange.

The article discusses implementing robust authentication and authorization in PHP to prevent unauthorized access, detailing best practices and recommending security-enhancing tools.

Article discusses retrieving data from databases using PHP, covering steps, security measures, optimization techniques, and common errors with solutions.Character count: 159

The article discusses strategies to prevent CSRF attacks in PHP, including using CSRF tokens, Same-Site cookies, and proper session management.

Prepared statements in PHP enhance database security and efficiency by preventing SQL injection and improving query performance through compilation and reuse.Character count: 159
