What best practices should be followed when handling MySQL query results in PHP to avoid missing or incomplete data in the output?

When handling MySQL query results in PHP, it is important to check for errors and handle them appropriately to avoid missing or incomplete data in the output. One common practice is to use error handling functions like mysqli_error() to capture any errors that may occur during the query execution. Additionally, always check if the query returned any results before attempting to process them to prevent errors due to empty result sets. 

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

// Check for errors
if (!$result) {
    die("Error: " . mysqli_error($connection));
}

// Check if any results were returned
if (mysqli_num_rows($result) > 0) {
    // Process the results
    while ($row = mysqli_fetch_assoc($result)) {
        // Output the data
        echo $row['column_name'] . "<br>";
    }
} else {
    echo "No results found.";
}

// Free the result set
mysqli_free_result($result);

Keywords

MySQL PHP query results data handling output completeness

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