What are some potential pitfalls of using multiple MySQL queries within a while loop in PHP?

Using multiple MySQL queries within a while loop in PHP can lead to performance issues due to the overhead of establishing a new database connection for each query. To solve this problem, you can fetch all the necessary data in a single query and then iterate over the results in the PHP code. 

// Fetch all necessary data in a single query
$query = "SELECT * FROM table_name";
$result = mysqli_query($connection, $query);

// Check if the query was successful
if ($result) {
    // Iterate over the results
    while ($row = mysqli_fetch_assoc($result)) {
        // Process each row here
    }

    // Free the result set
    mysqli_free_result($result);
} else {
    // Handle query error
    echo "Error: " . mysqli_error($connection);
}

// Close the connection
mysqli_close($connection);

Keywords

MySQL queries while loop PHP performance optimization

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