How can PHP developers effectively troubleshoot issues related to displaying graph data in JPchart using SQL variables?

To troubleshoot issues related to displaying graph data in JPchart using SQL variables, PHP developers can start by checking the SQL query to ensure it is retrieving the correct data. They can also verify that the data is being properly formatted before passing it to JPchart for graph rendering. Additionally, developers can use print_r or var_dump functions to inspect the data structure and identify any discrepancies.

// Assuming $sqlQuery is the SQL query to retrieve graph data and $data is the array containing the retrieved data

// Check the SQL query
$result = mysqli_query($connection, $sqlQuery);
if (!$result) {
    die('Invalid query: ' . mysqli_error());
}

// Fetch data from the result
$data = array();
while ($row = mysqli_fetch_assoc($result)) {
    $data[] = $row['data_column'];
}

// Verify data structure
var_dump($data);

// Pass data to JPchart for graph rendering
// Code for rendering the graph with JPchart using $data