How to process table data in php

With the continuous expansion and development of PHP programmers, data processing is becoming more and more simple and convenient. In daily work, processing tabular data is one of the very common tasks among PHP programmers. Here, this article will introduce how to modify table data using PHP. We will take an in-depth look at the key features in PHP that enable this task, and how to work with tabular data from a PHP programmer's perspective. let's start!

Step 1: Create a MySQL database

First, we need to create a MySQL database locally or on the server. In this database, a new table needs to be created to save tabular data. Presenting the following example:

CREATE TABLE users (

id INT(6) UNSIGNED AUTO_INCREMENT PRIMARY KEY,
username VARCHAR(30) NOT NULL,
email VARCHAR(50) NOT NULL,
password VARCHAR(30) NOT NULL,
reg_date TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP

)

Step 2: Write a PHP file

In this step, we will write a PHP files to connect to MySQL database and tabular data. Copy the following code into your PHP file:

$servername = "localhost"; //Database address
$username = "username"; //Database username
$password = "password"; //Database password
$dbname = "myDB"; //Database name

// Create connection
$conn = new mysqli($servername, $username, $password, $dbname);

// Check connection
if ($conn->connect_error) {

die("Connection failed: " . $conn->connect_error);

}
echo "Connected successfully";
?>

This code will establish a connection to the MySQL database. If the connection is successful, the message "Connected successfully" will be displayed.

Step 3: Present table data

Next, we will use PHP to query the MySQL database and present the table data on the web page. Copy the following code into the PHP file:

$sql = "SELECT id, username, email, password FROM users";
$result = $conn->query($sql);

if ($result->num_rows > 0) {

// 输出数据
while($row = $result->fetch_assoc()) {
    echo "id: " . $row["id"]. " - Name: " . $row["username"]. " - Email: " . $row["email"]. "- Password: " . $row["password"]. "<br>";
}

} else {

echo "0 results";

}

This code will query the MySQL database for " users" table, which presents tabular data on the web page. The way to output the data is to use a while loop in PHP to iterate through the result set and use the fetch_assoc() method to get the next row as an associative array.

Step 4: Modify the table data

Now, we have been able to successfully present the table data. On this basis, we can use PHP to modify the table data. Copy the following code into the PHP file:

$sql = "UPDATE users SET username='John Doe' WHERE id=2";

if ($conn->query($ sql) === TRUE) {

echo "Record updated successfully";

} else {

echo "Error updating record: " . $conn->error;

}

This code will update the row with ID 2 in the "users" table, changing the username Change to "John Doe". Use the update command, the parameters are table name, modification information and modification conditions.

Conclusion

In this article, we learned how to modify table data using PHP. We took an in-depth look at how to use PHP to query a MySQL database and render tabular data on a web page. We also learned how to use the update command to modify table data. This knowledge will make your PHP development more efficient and streamlined. If you want to know more tips and tricks of PHP development, please continue to follow our blog.

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