How to modify php data

PHP is a widely used programming language, especially for developing web applications. It can easily connect to different types of databases, including MySQL and PostgreSQL. Therefore, PHP is widely used to develop web applications containing various data manipulations and modifications.

In this article, we will introduce some common PHP data modification methods.

1. Use SQL query to modify data

First, you can use SQL query statements to modify the data in the database. For example, the following code can modify the phone number of a user named "John":

$sql = "UPDATE users SET phone_number='123456789' WHERE name='John'";
$result = mysqli_query($con,$sql);

This will perform an update query using the mysqli_query() function of the MySQLi extension. Here, $con is the connection to the database, and $sql is the query statement. Modifications may also be performed under other conditions, such as using a user ID or other identifier.

2. Use PHP to edit and modify data

The second method of modifying data is to use PHP code to edit the data. In this case you need to retrieve the data from the database first and then use it for modification.

Consider the following example where you can retrieve a user named "John" from the database and change his phone number to "123456789":

// Retrieve data from the database
$sql = "SELECT * FROM users WHERE name='John'";
$result = mysqli_query($con,$sql);
$user = mysqli_fetch_array($result);

// Update user data
$user['phone_number'] = '123456789';

// Save changes to the database
$sql = "UPDATE users SET phone_number='" . $user['phone_number'] . "' WHERE id=" . $user['id'];
$result = mysqli_query($con,$sql);

This code will first retrieve from the database A user named "John" and store it in the $user variable. The code then changes the phone number in the $user array to "123456789". Finally, the code saves these changes back to the database.

3. Use the ORM framework to modify data

The third method for modifying data is to use the ORM (Object Relational Mapping) framework. ORM framework allows you to access and manipulate databases using an object-oriented approach.

CodeIgniter is a PHP framework that provides a popular ORM library called "Active Recording". Here is sample code for updating a user’s phone number using an active record:

// Load the user model
$this->load->model('user_model');

// Retrieve user data
$user = $this->user_model->find_by_name('John');

// Update user phone number
$user->phone_number = '123456789';

// Save changes to the database
$user->save();

Here, we are using CodeIgniter’s user model object, the active records library allows us to easily retrieve and modify user data. We simply use the find_by_name() method to retrieve the user named "John", change his phone number to "123456789", and then call the save() method to save the changes back to the database.

Overall, modifying data in PHP is an important task because it allows you to update user and application data in real time. These three methods provide different ways to update data in the database, depending on your code architecture and the tools you use.

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