What are some common pitfalls to avoid when working with MySQL queries and result resources in PHP to prevent errors like "supplied argument is not a valid MySQL result resource"?

One common pitfall to avoid when working with MySQL queries and result resources in PHP is not checking if the query was successful before trying to fetch results. To prevent errors like "supplied argument is not a valid MySQL result resource", always check if the query was successful and handle any potential errors. 

// Example of checking if the query was successful before fetching results
$query = "SELECT * FROM users";
$result = mysqli_query($connection, $query);

if($result){
    // Fetch results here
    while($row = mysqli_fetch_assoc($result)){
        // Process the data
    }
} else {
    // Handle query error
    echo "Error: " . mysqli_error($connection);
}

Keywords

MySQL queries result resources PHP error handling valid MySQL result resource

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