How to store php array data in the database

php is a scripting language widely used in the field of web development. Its powerful data processing capabilities make it highly efficient and flexible in developing websites, applications and software. The array in PHP is an important data structure that can be used to save multiple related data items, such as user login information, product prices and inventory, etc. In practical applications, storing PHP array data in the database is a common requirement. This article will introduce how to store PHP array data in the database.

How php array data is stored

php array is a very flexible data structure that can be used to store various types of data, such as strings, numbers, Boolean values, and objects. . Before storing PHP array data into the database, you need to choose a suitable storage method. Common PHP array storage methods include the following:

1. Convert the PHP array into JSON format data and store it in the database

JSON is a lightweight data exchange format. In text format, it is easy to read and write, and allows data exchange between different platforms and programs. In PHP, you can use the json_encode() function to convert PHP array data into JSON format data, and use the json_decode() function to convert JSON format data into PHP arrays. The specific operations are as follows:

// 定义一个php数组
$data = array(
  'name' => '张三',
  'age' => 18,
  'email' => 'zhangsan@example.com'
);

// 将php数组转换为JSON格式数据
$json = json_encode($data);

// 将JSON格式数据插入数据库中
$sql = "INSERT INTO users (name, data) VALUES ('张三', '$json')";

2. Convert the PHP array into serialized format data and store it in the database

Serialization is a way to encode the data structure for storage and transmission. In PHP, you can use the serialize() function to convert PHP array data into serialized format data, and use the unserialize() function to convert serialized format data into PHP arrays. The specific operations are as follows:

// 定义一个php数组
$data = array(
  'name' => '张三',
  'age' => 18,
  'email' => 'zhangsan@example.com'
);

// 将php数组转换为序列化格式数据
$serialized_data = serialize($data);

// 将序列化格式数据插入数据库中
$sql = "INSERT INTO users (name, data) VALUES ('张三', '$serialized_data')";

3. Splice the php array and store it in the database

After splicing the php array, you can get a string type data item, which can be directly stored in the database. middle. The specific operations are as follows:

// 定义一个php数组
$data = array(
  'name' => '张三',
  'age' => 18,
  'email' => 'zhangsan@example.com'
);

// 对数组进行拼接
$data_str = implode(',', $data);

// 将拼接后的字符串插入数据库中
$sql = "INSERT INTO users (name, data) VALUES ('张三', '$data_str')";

The above three storage methods have their advantages and disadvantages in practical applications, and the specific choice needs to be weighed according to the specific situation.

Insertion and retrieval of php array data

After storing the php array data in the database, insertion and retrieval operations are required. PHP database operations are mainly implemented through PDO, mysqli and mysql functions.

1.PDO method

PDO is a universal database access method that supports multiple types of databases, such as MySQL, SQL Server and Oracle. In php, you can connect to the database through PDO and execute SQL statements to perform database operations. The specific operations are as follows:

// 连接数据库
$dsn = 'mysql:host=localhost;dbname=mydatabase;charset=utf8';
$user = 'root';
$password = '123456';
$dbh = new PDO($dsn, $user, $password);

// 插入php数组数据
$data = array(
  'name' => '张三',
  'age' => 18,
  'email' => 'zhangsan@example.com'
);
$json_data = json_encode($data);
$sql = "INSERT INTO users (name, data) VALUES ('张三', '$json_data')";
$dbh->exec($sql);

// 获取php数组数据
$sql = "SELECT * FROM users WHERE name='张三'";
$stmt = $dbh->query($sql);
$row = $stmt->fetch(PDO::FETCH_ASSOC);
$data = json_decode($row['data']);
echo $data['name'];  // 输出：张三

2.mysqli method

mysqli is an improved mysql extension library that supports both object-oriented and process-oriented operations. In php, you can connect to the database through mysqli and execute SQL statements to perform database operations. The specific operations are as follows:

// 连接数据库
$servername = "localhost";
$username = "root";
$password = "123456";
$dbname = "mydatabase";
$conn = mysqli_connect($servername, $username, $password, $dbname);

// 插入php数组数据
$data = array(
  'name' => '张三',
  'age' => 18,
  'email' => 'zhangsan@example.com'
);
$json_data = json_encode($data);
$sql = "INSERT INTO users (name, data) VALUES ('张三', '$json_data')";
mysqli_query($conn, $sql);

// 获取php数组数据
$sql = "SELECT * FROM users WHERE name='张三'";
$result = mysqli_query($conn, $sql);
$row = mysqli_fetch_assoc($result);
$data = json_decode($row['data']);
echo $data['name'];  // 输出：张三

3.mysql function mode

The mysql function is a mysql extension library widely used in earlier versions and supports process-oriented operation. In PHP, you can use the mysql_connect() function to connect to the database and use the mysql_query() function to execute SQL statements to perform database operations. The specific operations are as follows:

// 连接数据库
$servername = "localhost";
$username = "root";
$password = "123456";
$conn = mysql_connect($servername, $username, $password);
mysql_select_db("mydatabase", $conn);

// 插入php数组数据
$data = array(
  'name' => '张三',
  'age' => 18,
  'email' => 'zhangsan@example.com'
);
$json_data = json_encode($data);
$sql = "INSERT INTO users (name, data) VALUES ('张三', '$json_data')";
mysql_query($sql);

// 获取php数组数据
$sql = "SELECT * FROM users WHERE name='张三'";
$result = mysql_query($sql);
$row = mysql_fetch_assoc($result);
$data = json_decode($row['data']);
echo $data['name'];  // 输出：张三

Summary

Storing PHP array data into the database is a common requirement. This article introduces the common PHP array storage methods and corresponding insertion and retrieval operation methods. In practical applications, it is necessary to choose an appropriate storage method according to the specific situation, and pay attention to the encoding and decoding operations of data to avoid garbled data or loss of data.

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