PHP | imagesetthickness() Function

Last Updated : 11 Jul, 2025
The imagesetthickness() function is an inbuilt function in PHP which is used to set the thickness for line drawing. Syntax: 
bool imagesetthickness( $image, $thickness )
Parameters: This function accepts two parameters as mentioned above and described below:
  • $image: It is returned by one of the image creation functions, such as imagecreatetruecolor(). It is used to create size of image.
  • $thickness: This parameter is used to set the thickness in pixel.
Return Value: This function returns True on success or False on failure. Below programs illustrate the imagesetthickness() function in PHP: Program 1: php 
<?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);
?>
Output: Program 2: php 
<?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);
?>
Output: Reference: https://www.php.net/manual/en/function.imagesetthickness.php
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