How to Create a Line Graph in PHP/MySQLi

Submitted by janobe on Monday, December 24, 2018 - 16:17.

Line graph is one of the most commonly used chart types and is very useful especially in the fields of statistics. It is composed of vertical y-axis and a horizontal x-axis which displays series information of data points connected by lines. Each of this axes is named with a data type, this will help you in monitoring your sales and determine the result accurately. Take a look at the procedure below on how to make Line graph program.

Creating Database

Create a database named “salesdb”. Execute the following query for adding table and inserting data in the table.

CREATE TABLE `tblsales` (
  `SalesId` int(11) NOT NULL,
  `TRANSDATE` date NOT NULL,
  `Product` varchar(90) NOT NULL,
  `TotalSales` double NOT NULL
) ENGINE=InnoDB DEFAULT CHARSET=latin1;
 
--
-- Dumping data for table `tblsales`
--
 
INSERT INTO `tblsales` (`SalesId`, `TRANSDATE`, `Product`, `TotalSales`) VALUES
(1, '2018-01-30', 'Surf Powder', 1400),
(2, '2018-02-28', 'Surf Powder', 800),
(3, '2018-03-31', 'Surf Powder', 5052),
(4, '2019-04-30', 'Surf Powder', 8030),
(5, '2019-05-31', 'Surf Powder', 10000);

Creating HTML and PHP Script

Step 1

Create and landing page and name it “index.php”

Step 2

Do the following codes for the index page.

<!DOCTYPE html>
<html lang="en"> 
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
        <meta name="viewport" content="width=device-width, initial-scale=1.0">
        <title>Graph</title> 
    </head>
    <body>
        <div style="width:50%;hieght:20%;text-align:center">
            <h2 class="page-header" >Analytics Sales Report </h2>
            <div><?php echo $productname; ?> </div>
            <canvas  id="chartjs_line"></canvas> 
        </div>    
    </body>
</html>

Step 3

Add the following extension to access Chart.js Libraries.

  <script src="//code.jquery.com/jquery-1.9.1.js"></script>
  <script src="//cdnjs.cloudflare.com/ajax/libs/Chart.js/2.4.0/Chart.min.js"></script>

Step 4

Create a php script for fetching the data in the database.

<?php
$con  = mysqli_connect("localhost","root","","salesdb");
 if (!$con) {
     # code...
    echo "Problem in database connection! Contact administrator!" . mysqli_error();
 }else{
         $sql ="SELECT * FROM tblsales";
         $result = mysqli_query($con,$sql);
         $chart_data="";
         while ($row = mysqli_fetch_array($result)) { 
          
            $productname=$row['Product'];
            $month[]  = date_format(date_create( $row['TRANSDATE']),"M d, Y")  ;
            $sales[] = $row['TotalSales'];
        }
     
 
 }
?>

Step 5

Create a JavaScript script for displaying a graph.

<script type="text/javascript">
    var ctx = document.getElementById("chartjs_line").getContext('2d');
                var myChart = new Chart(ctx, {
                    type: 'line',
                    data: {
                        labels:<?php echo json_encode($month); ?>,
                        datasets: [{
                            backgroundColor: [
                               "#5969ff",
                                "#ff407b",
                                "#25d5f2",
                                "#ffc750",
                                "#2ec551",
                                "#7040fa",
                                "#ff004e"
                            ],
                            data:<?php echo json_encode($sales); ?>,
                        }]
                    },
                    options: {
                           legend: {
                        display: true,
                        position: 'bottom',
 
                        labels: {
                            fontColor: '#71748d',
                            fontFamily: 'Circular Std Book',
                            fontSize: 14,
                        }
                    },
 
                    
                }
                });
    </script>

Full Source Code

<?php
$con  = mysqli_connect("localhost","root","","salesdb");
 if (!$con) {
     # code...
    echo "Problem in database connection! Contact administrator!" . mysqli_error();
 }else{
         $sql ="SELECT * FROM tblsales";
         $result = mysqli_query($con,$sql);
         $chart_data="";
         while ($row = mysqli_fetch_array($result)) { 
          
            $productname=$row['Product'];
            $month[]  = date_format(date_create( $row['TRANSDATE']),"M d, Y")  ;
            $sales[] = $row['TotalSales'];
        }
     
 
 }
    
 
?>
<!DOCTYPE html>
<html lang="en"> 
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
        <meta name="viewport" content="width=device-width, initial-scale=1.0">
        <title>Graph</title> 
    </head>
    <body>
        <div style="width:50%;hieght:20%;text-align:center">
            <h2 class="page-header" >Analytics Sales Report </h2>
            <div><?php echo $productname; ?> </div>
            <canvas  id="chartjs_line"></canvas> 
        </div>    
    </body>
  <script src="//code.jquery.com/jquery-1.9.1.js"></script>
  <script src="//cdnjs.cloudflare.com/ajax/libs/Chart.js/2.4.0/Chart.min.js"></script>
    <script type="text/javascript">
      var ctx = document.getElementById("chartjs_line").getContext('2d');
                var myChart = new Chart(ctx, {
                    type: 'line',
                    data: {
                        labels:<?php echo json_encode($month); ?>,
                        datasets: [{
                            backgroundColor: [
                               "#5969ff",
                                "#ff407b",
                                "#25d5f2",
                                "#ffc750",
                                "#2ec551",
                                "#7040fa",
                                "#ff004e"
                            ],
                            data:<?php echo json_encode($sales); ?>,
                        }]
                    },
                    options: {
                           legend: {
                        display: true,
                        position: 'bottom',
 
                        labels: {
                            fontColor: '#71748d',
                            fontFamily: 'Circular Std Book',
                            fontSize: 14,
                        }
                    },
 
                    
                }
                });
    </script>
</html>

For any questions about this article. You can contact me @ Email – [email protected] Mobile No. – 09305235027 – TNT Or feel free to comment below.

Comments

nice

retret

good

comment

very good as anotice if you want to not apper any color in dody charts use this code labels:, datasets: [{ backgroundColor: [ " #FFFFFF00", // "blue", // "yellow", // "pink", // "green", // "silver" ], borderColor: [ " red", // "blue", // "yellow", // "pink", // "green", // "silver" ],

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