Is it recommended for PHP developers to first check for the existence of a record before deciding to update or insert using ON DUPLICATE KEY UPDATE?

It is not necessary for PHP developers to first check for the existence of a record before deciding to update or insert using ON DUPLICATE KEY UPDATE. This is because the ON DUPLICATE KEY UPDATE clause in MySQL automatically handles the logic of updating the existing record if a duplicate key is found, or inserting a new record if no duplicate key is found. This simplifies the code and reduces the number of database queries needed.

// Example of using ON DUPLICATE KEY UPDATE in a SQL query
$sql = "INSERT INTO table_name (column1, column2) VALUES ('value1', 'value2') 
        ON DUPLICATE KEY UPDATE column1 = 'new_value1', column2 = 'new_value2'";
$result = mysqli_query($connection, $sql);

if($result){
    echo "Record inserted or updated successfully.";
} else {
    echo "Error: " . mysqli_error($connection);
}