Are there any best practices for handling database query results in PHP?

When handling database query results in PHP, it is important to properly handle errors, iterate through the results, and free up resources after you are done with the results. One best practice is to check if the query was successful before trying to fetch results. 

// Execute the query
$result = mysqli_query($conn, "SELECT * FROM users");

// Check if the query was successful
if ($result) {
    // Fetch results and iterate through them
    while ($row = mysqli_fetch_assoc($result)) {
        // Process each row
        echo $row['username'] . "<br>";
    }
    
    // Free up resources
    mysqli_free_result($result);
} else {
    echo "Error executing query: " . mysqli_error($conn);
}

Keywords

SQL database queries error handling PDO result sets

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