line graph can not show up using php

Question

The code suppose show the image like this below

however the result is this below

this is my code here

simplegraph.php

<?php
// set up image canvas
$height = 200;
$width = 200;
$im = imagecreatetruecolor(width, height)($width, $height);
$white = imagecolorallocate ($im, 255, 255, 255);
$blue = imagecolorallocate ($im, 0, 0, 255);

// draw on image
imagefill($im, 0, 0, $blue);
imageline($im, 0, 0, $width, $height, $white);
imagestring($im, 4, 50, 150, 'Sales', $white);

// output image
header('Content-type: image/png');
imagepng ($im);

// clean up
imagedestroy($im);
?>

here is all files in

htdocs

For the future, it's best to [get errors to display](https://stackoverflow.com/questions/1053424/how-do-i-get-php-errors-to-display) when debugging — apokryfos, Feb 13 '18 at 09:14

mega6382 · Accepted Answer · 2018-02-13T09:12:36.697

This is probably because of this statement:

$im = imagecreatetruecolor(width, height)($width, $height);

The above is incorrect syntax. Change this to:

$im = imagecreatetruecolor($width, $height);

The image will show after this, because PHP is assuming, that width and height are constants, but they do not exist and it will give out error, and after that the ($width, $height) part will cause the syntax error. But that is the part that you actually need.

line graph can not show up using php

1 Answers1