How can PHP developers prevent duplicate entries in a MySQL database when inserting new data?

To prevent duplicate entries in a MySQL database when inserting new data, PHP developers can use the `INSERT IGNORE` or `INSERT ON DUPLICATE KEY UPDATE` queries. These queries allow developers to handle duplicate entry errors gracefully by either ignoring them or updating the existing record. 

<?php

// Establish a connection to the MySQL database
$connection = new mysqli('localhost', 'username', 'password', 'database');

// Prepare the SQL query with INSERT IGNORE to prevent duplicate entries
$query = "INSERT IGNORE INTO table_name (column1, column2) VALUES ('value1', 'value2')";

// Execute the query
$result = $connection->query($query);

// Check if the query was successful
if ($result) {
    echo "Data inserted successfully!";
} else {
    echo "Error inserting data: " . $connection->error;
}

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

?>

Keywords

PHP MySQL duplicate entries prevent insertion

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