How to Generate Charts using PHP, MySQL, and the Google Charts API?

PHP MySQL Google Chart JSON - Complete Example

This example shows you how to generate a chart using PHP, MySQL and the Google Chart API.

Prerequisites:

• PHP, Apache and MySQL

Database Setup:

1. Use phpMyAdmin to create a file called Database for "chart".
2. Create a table called "googlechart" and make sure it contains at least two columns. For example: weekly_task and percentage.
3. Insert some data into a table where the percentage column only contains numbers.

PHP-MySQL-JSON-Google Chart Example:

$con = mysqli_connect("localhost", "Username", "Password") or die("Failed to connect with database!!!!");
mysqli_select_db("Database Name", $con);

$result = mysqli_query($con, "SELECT * FROM googlechart");

$rows = array();
$table = array();
$table['cols'] = array(
    array('label' => 'Weekly Task', 'type' => 'string'),
    array('label' => 'Percentage', 'type' => 'number')
);

while ($row = mysqli_fetch_assoc($result)) {
    $temp = array();
    $temp[] = array('v' => (string) $row['weekly_task']);
    $temp[] = array('v' => (int) $row['percentage']);
    $rows[] = array('c' => $temp);
}

$table['rows'] = $rows;
$jsonTable = json_encode($table);

echo $jsonTable;
?>



    <!-- Load the Ajax API -->
    <script type="text/javascript" src="https://www.google.com/jsapi"></script>
    <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.8.2/jquery.min.js"></script>
    <script type="text/javascript">

    // Load the Visualization API and the piechart package.
    google.load('visualization', '1', {'packages': ['corechart']});

    // Set a callback to run when the Google Visualization API is loaded.
    google.setOnLoadCallback(drawChart);

    function drawChart() {

      // Create our data table out of JSON data loaded from server.
      var data = new google.visualization.DataTable(<?php echo $jsonTable; ?>);
      var options = {
           title: 'My Weekly Plan',
          is3D: 'true',
          width: 800,
          height: 600
        };
      // Instantiate and draw our chart, passing in some options.
      // Do not forget to check your div ID
      var chart = new google.visualization.PieChart(document.getElementById('chart_div'));
      chart.draw(data, options);
    }
    </script>


    <!-- this is the div that will hold the pie chart -->
    <div>
<p><strong> Error caused by short tag syntax: </strong></p>
<p> Some users may encounter this error locally or on the server: </p> <pre class="brush:php;toolbar:false">syntax error var data = new google.visualization.DataTable(<?php echo $jsonTable; ?>);

This means that its environment does not support short tags. The workaround is to use the following syntax instead:

<?php echo $jsonTable; ?>

Everything should work fine.