(PHP 4 >= 4.0.6, PHP 5, PHP 7, PHP 8)
imagesetthickness — Set the thickness for line drawing
   imagesetthickness() sets the thickness of the lines
   drawn when drawing rectangles, polygons, arcs etc. to
   thickness pixels.
  
imageA GdImage object, returned by one of the image creation functions, such as imagecreatetruecolor().
thicknessThickness, in pixels.
   Returns true on success or false on failure.
  
| Version | Description | 
|---|---|
| 8.0.0 | imageexpects a GdImage
  instance now; previously, a validgdresource was expected. | 
Example #1 imagesetthickness() example
<?php
// Create a 200x100 image
$im = imagecreatetruecolor(200, 100);
$white = imagecolorallocate($im, 0xFF, 0xFF, 0xFF);
$black = imagecolorallocate($im, 0x00, 0x00, 0x00);
// Set the background to be white
imagefilledrectangle($im, 0, 0, 299, 99, $white);
// Set the line thickness to 5
imagesetthickness($im, 5);
// Draw the rectangle
imagerectangle($im, 14, 14, 185, 85, $black);
// Output image to the browser
header('Content-Type: image/png');
imagepng($im);
imagedestroy($im);
?>
The above example will output something similar to:
