PHP | imagefill() Function

<?php

// Create an image of given size
$image = imagecreatetruecolor(500, 400);

// Sets background to green
$green = imagecolorallocate($image, 0, 153, 0);
imagefill($image, 0, 0, $green);

header('Content-type: image/png');
imagepng($image);
imagedestroy($image);
?>

<?php
  
// It create the size of image or blank image.
$image = imagecreatetruecolor(500, 300);
  
// Set the background color of image.
$bg = imagecolorallocate($image, 205, 220, 200);
  
// Fill background with above selected color.
imagefill($image, 0, 0, $bg);
 
// Set the color of an ellipse.
$col_ellipse = imagecolorallocate($image, 0, 102, 0);
  
// Function to draw the filled ellipse.
imagefilledellipse($image, 250, 150, 400, 250, $col_ellipse);
  
// Output of the image.
header("Content-type: image/png");
imagepng($image);
  
?>