What are the best practices for handling MySQL queries in PHP to avoid errors like "supplied argument is not a valid MySQL result resource"?

When handling MySQL queries in PHP, it is essential to properly check for errors and handle them gracefully to avoid issues like "supplied argument is not a valid MySQL result resource." One common reason for this error is not checking if the query was successful before trying to use the result. To avoid this error, always check if the query was executed successfully and then proceed to fetch the result. 

// Execute the query
$result = mysqli_query($connection, $query);

// Check if the query was successful
if($result){
    // Fetch the result
    while($row = mysqli_fetch_assoc($result)){
        // Process the data
        echo $row['column_name'];
    }
} else {
    // Handle the error
    echo "Error: " . mysqli_error($connection);
}

Keywords

MySQL queries PHP error handling valid MySQL result resource best practices

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