How can PHP developers effectively debug and troubleshoot issues related to data duplication in database outputs?

To effectively debug and troubleshoot issues related to data duplication in database outputs, PHP developers can start by checking the database query to ensure that it is retrieving unique records. They can also utilize SQL DISTINCT or GROUP BY clauses to filter out duplicate data. Additionally, developers can use PHP functions like array_unique() to remove duplicate entries from arrays before displaying the data. 

// Example code snippet to remove duplicates from database output
$query = "SELECT DISTINCT column_name FROM table_name";
$result = mysqli_query($connection, $query);

if(mysqli_num_rows($result) > 0){
    while($row = mysqli_fetch_assoc($result)){
        // Output unique data
        echo $row['column_name'] . "<br>";
    }
}

Keywords

PHP debugging troubleshooting data duplication database outputs

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