What are some considerations for integrating external CSV data into an existing SQL database for PHP applications?

When integrating external CSV data into an existing SQL database for PHP applications, some considerations include ensuring that the CSV data is properly formatted and matches the structure of the database tables, handling any potential data conflicts or duplicates, and implementing error handling to address any issues that may arise during the integration process. 

<?php

// Connect to the database
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "database";
$conn = new mysqli($servername, $username, $password, $dbname);

// Check connection
if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
}

// Read the CSV file
$csvFile = 'data.csv';
$csv = array_map('str_getcsv', file($csvFile));

// Iterate through the CSV data and insert into the database
foreach($csv as $row) {
    $sql = "INSERT INTO table_name (column1, column2, column3) VALUES ('" . $row[0] . "', '" . $row[1] . "', '" . $row[2] . "')";
    if ($conn->query($sql) === FALSE) {
        echo "Error: " . $sql . "<br>" . $conn->error;
    }
}

// Close the connection
$conn->close();

?>

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