php sql备份

<?php
// 数据库连接信息
$host = 'localhost';
$user = 'username';
$pass = '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');

// 获取数据库所有表的名称
$tables = mysqli_query("SHOW TABLES");

while ($table = mysqli_fetch_array($tables)) {
    $table_name = $table[0];
    
    // 导出表结构
    $result = mysqli_query("SHOW CREATE TABLE $table_name");
    $row = mysqli_fetch_array($result);
    $schema = $row['Create Table'];
    fwrite($handle, "-- Table structure for table `$table_name`\n");
    fwrite($handle, "$schema;\n\n");
    
    // 导出表数据
    $rows = mysqli_query("SELECT * FROM $table_name");
    while ($row = mysqli_fetch_assoc($rows)) {
        $values = [];
        foreach ($row as $value) {
            if (is_string($value)) {
                $values[] = "'" . addslashes($value) . "'";
            } else {
                $values[] = $value;
            }
        }
        $values = implode(', ', $values);
        fwrite($handle, "INSERT INTO `$table_name` VALUES ($values);\n");
    }
    fwrite($handle, "\n");
}

fclose($handle);

echo "Backup completed: $backup_file";
?>