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Asked: 2026-05-26T15:03:57+00:00

I have the following code which works perfectly fine in my php file and

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I have the following code which works perfectly fine in my php file and generates a histogram image. However as soon as I add an html tags it wouldn’t generate a histogram anymore but an empty image. It seems to me that the problem is in the first line header("Content-type: image/jpeg");. But how can i fix it?

<html>
    <?php
        // Send the PNG header information. Replace for JPEG or GIF or whatever
        header("Content-type: image/jpeg");

            // This array of values is just here for the example.
            $data = array('3400','2570','245','473','1000','3456','780');

            // Get the total value of columns we are going to plot
            $sum = array_sum($data);

            // Get the height and width of the final image
            $height = 255;
            $width = 320;

            $im = imagecreate($width,$height); // width , height px

            // Generate the image variables
            $white = imagecolorallocate($im,255,255,255); 
            $black = imagecolorallocate($im,0,0,0);   
            $red = imagecolorallocate($im,255,0,0);   


            imageline($im, 10, 5, 10, 230, $black);
            imageline($im, 10, 230, 300, 230, $black);

            // Now plot each column
            $x = 15;   
            $y = 230;   
            $x_width = 20;  
            $y_ht = 0; 

            for ($i=0;$i<7;$i++){

              $y_ht = ($data[$i]/$sum)* $height;    

                  // This part is just for 3D effect
              imagerectangle($im,$x,$y,$x+$x_width,($y-$y_ht),$red);
                  imagestring( $im,2,$x-1,$y+10,$data[$i],$black);

              $x += ($x_width+20);  

            }

            imagejpeg($im);

    ?> 
</html>
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1 Answer

  1. Editorial Team

    Remove the tag in your PHP file as it’s not HTML document.
    Make sure there’s no space before
    <?php
    open tag.

    Call that file within and img tag like

    <img src="genrated.jpg.php" />

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