PHP | imagesetthickness() Function

<?php

// Create an image of given size
$im = imagecreatetruecolor(400, 300);
$green = imagecolorallocate($im, 0, 153, 0);
$white = imagecolorallocate($im, 0xff, 0xff, 0xff);

// Set the background to be white
imagefilledrectangle($im, 0, 0, 400, 300, $green);

// Set the line thickness to 5
imagesetthickness($im, 5);

// Draw the rectangle
imagerectangle($im, 50, 50, 350, 250, $white);

// Output image to the browser
header('Content-Type: image/png');

imagepng($im);
imagedestroy($im);
?>

<?php
 
// Create an image of given size
$im = imagecreatetruecolor(400, 100);
$green = imagecolorallocate($im, 0, 153, 0);
$white = imagecolorallocate($im, 0xff, 0xff, 0xff);
 
// Set the background to be white
imagefilledrectangle($im, 0, 0, 400, 300, $green);
 
// Set the line thickness to 15
imagesetthickness($im, 15);

// Draw the line
imageline($im, 50, 50, 350, 50, $white);
 
// Output image to the browser
header('Content-Type: image/png');
 
imagepng($im);
imagedestroy($im);
?>