php 备份mysql数据库

<?php
// 数据库连接信息
$host = 'localhost';
$user = 'username';
$password = 'password';
$dbname = 'database_name';

// 备份文件名
$backup_file = 'backup_' . date('Y-m-d_H-i-s') . '.sql';

// 创建备份文件
$handle = fopen($backup_file, 'w');

// 连接数据库
$conn = mysqli_connect($host, $user, $password, $dbname);

// 检查连接
if (!$conn) {
    die('连接失败: ' . mysqli_connect_error());
}

// 获取数据库所有表的名称
$tables = mysqli_query($conn, 'SHOW TABLES');
while ($table = mysqli_fetch_row($tables)) {
    $table_name = $table[0];
    
    // 导出表结构
    $result = mysqli_query($conn, 'SHOW CREATE TABLE ' . $table_name);
    $row = mysqli_fetch_row($result);
    $schema = $row[1];
    fwrite($handle, "-- Table structure for table `$table_name`\n");
    fwrite($handle, "$schema\n\n");
    
    // 导出表数据
    $rows = mysqli_query($conn, 'SELECT * FROM ' . $table_name);
    while ($row = mysqli_fetch_assoc($rows)) {
        $values = [];
        foreach ($row as $value) {
            $values[] = "'" . mysqli_real_escape_string($conn, $value) . "'";
        }
        $values_str = implode(', ', $values);
        fwrite($handle, "INSERT INTO `$table_name` VALUES ($values_str);\n");
    }
    fwrite($handle, "\n");
}

// 关闭文件和数据库连接
fclose($handle);
mysqli_close($conn);

echo "备份完成，文件名：" . $backup_file;
?>