In PHP, what steps should be taken to ensure that variable values are correctly inserted into a target table when merging tables from different databases?

When merging tables from different databases in PHP, it is important to ensure that variable values are correctly inserted into the target table. To achieve this, you should use parameterized queries to prevent SQL injection attacks and ensure the proper handling of variable values during the insertion process. 

// Assuming $sourceDb and $targetDb are the connections to the source and target databases respectively

// Retrieve data from the source table
$query = "SELECT * FROM source_table";
$result = mysqli_query($sourceDb, $query);

// Insert data into the target table
while ($row = mysqli_fetch_assoc($result)) {
    $insertQuery = "INSERT INTO target_table (column1, column2) VALUES (?, ?)";
    $stmt = mysqli_prepare($targetDb, $insertQuery);
    mysqli_stmt_bind_param($stmt, 'ss', $row['value1'], $row['value2']);
    mysqli_stmt_execute($stmt);
    mysqli_stmt_close($stmt);
}

// Close database connections
mysqli_close($sourceDb);
mysqli_close($targetDb);

Keywords

PHP database merging variable insertion SQL injection data validation

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