“call to undefined function imagecreatetruecolor” error in PHP & pChart

Use the following code to test if you have GD extension:

<?php
$testGD = get_extension_funcs("gd"); // Grab function list 
if (!$testGD){ echo "GD not even installed."; exit; }
echo"<pre>".print_r($testGD,true)."</pre>";

If you get the message that it’s not installed, then check the following steps:

1. phpinfo() and look up php.ini path
2. edit php.ini: extension_dir=<path to your extensions>
3. edit php.ini: extension=php_gd2.dll //uncomment or add
4. Restart web server
5. Run the test script again