How to implement automatic data backup and recovery function in PHP

How to implement automatic data backup and recovery functions in PHP

When developing and maintaining web applications, data backup and recovery functions are very important. In the face of data loss or unexpected failure, backup data can ensure the security and integrity of the data and quickly restore the normal operation of the system. This article will introduce how to use PHP to implement automatic data backup and recovery functions, and provide specific code examples.

1. Data backup

Data backup refers to copying the database or other important data to a safe location to ensure that the data will not be lost. The following are the steps to implement data backup:

1. Connect to the database: First, we need to use PHP's database extension to connect to the database.

$db_host = 'localhost';
$db_user = 'username';
$db_pass = 'password';
$db_name = 'database_name';

$conn = mysqli_connect($db_host, $db_user, $db_pass, $db_name);

if (!$conn) {
    die("数据库连接失败：" . mysqli_connect_error());
}

2. Get the list of data tables: Use the SHOW TABLES statement to get all the data tables in the database.

$tables = mysqli_query($conn, "SHOW TABLES");

3. Create backup folder: Create a folder to store backup files.

$backup_folder = '/path/to/backup/folder';
if (!file_exists($backup_folder)) {
    mkdir($backup_folder, 0777, true);
}

4. Circular backup of data tables: Use the mysqldump command to back up each data table and save the results to the backup folder.

while ($table = mysqli_fetch_row($tables)) {
    $table_name = $table[0];
    $output_file = $backup_folder . '/' . $table_name . '-' . date('Y-m-d-H-i-s') . '.sql';
    $command = "mysqldump -h {$db_host} -u {$db_user} -p{$db_pass} {$db_name} {$table_name} > {$output_file}";
    system($command, $output);
}

5. Close the database connection: After the backup is completed, close the connection to the database.

mysqli_close($conn);

2. Data recovery

Data recovery refers to re-importing the backed-up data into the database to restore the system to the state at the time of backup. The following are the steps to achieve data recovery:

1. Connect to the database: Again, you need to connect to the database first.

$db_host = 'localhost';
$db_user = 'username';
$db_pass = 'password';
$db_name = 'database_name';

$conn = mysqli_connect($db_host, $db_user, $db_pass, $db_name);

if (!$conn) {
    die("数据库连接失败：" . mysqli_connect_error());
}

2. Get backup file list: Get all backup files in the backup folder.

$backup_folder = '/path/to/backup/folder';
$backup_files = glob($backup_folder . '/*.sql');

3. Cycle recovery of backup data: Use the mysql command to import the data in the backup file into the database.

foreach ($backup_files as $backup_file) {
    $command = "mysql -h {$db_host} -u {$db_user} -p{$db_pass} {$db_name} < {$backup_file}";
    system($command, $output);
}

4. Close the database connection: After the recovery is completed, close the connection to the database.

mysqli_close($conn);

To sum up, by using PHP's database extension and system commands, we can easily realize the automatic backup and recovery function of data. By running backup scripts regularly, we can keep our data safe in case of data loss or system failure. At the same time, we can also customize data backup and recovery strategies according to actual needs to meet the needs of different scenarios.

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