What are some best practices for implementing error handling and feedback messages when checking for duplicate entries in PHP?

When checking for duplicate entries in PHP, it is important to implement error handling and provide clear feedback messages to the user. This can help prevent duplicate data from being entered and improve the overall user experience. One best practice is to use conditional statements to check for duplicates before inserting data into the database, and to display an error message if a duplicate entry is found. 

// Check for duplicate entry
$existing_entry = // query to check if entry already exists in database

if ($existing_entry) {
    // Display error message
    echo "Error: Entry already exists";
} else {
    // Insert data into database
    // query to insert data
    echo "Entry successfully added";
}

Keywords

try-catch exception handling PDO SQL error messages

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