How can PHP developers optimize their code to avoid inserting duplicate data into a database table?

To avoid inserting duplicate data into a database table, PHP developers can use the "INSERT IGNORE" or "INSERT ON DUPLICATE KEY UPDATE" SQL queries. These queries allow developers to either ignore the insertion if a duplicate key constraint is violated or update the existing record with new values. By using these queries, developers can prevent duplicate data from being inserted into the database table. 

<?php

$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "database";

// Create connection
$conn = new mysqli($servername, $username, $password, $dbname);

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

// SQL query to insert data with IGNORE option to avoid duplicates
$sql = "INSERT IGNORE INTO table_name (column1, column2) VALUES ('value1', 'value2')";

if ($conn->query($sql) === TRUE) {
    echo "Record inserted successfully";
} else {
    echo "Error: " . $sql . "<br>" . $conn->error;
}

$conn->close();

?>

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