Editing .twig files with PHP

When I edit a .twig file and insert PHP.. I get an error.

Here is a snippet of PHP code from my old cart that I am trying to use on my 3.0.2.0 cart
/catalog/view/theme/default/template/product/product.tpl
I want to add it to product.twig - located at /catalog/view/theme/default/template/product/product.twig

Here is the code I am inserting into product.twig Obviously I need to add something more, I am not familiar with TWIG yet.


Fatal error: Uncaught exception 'Twig_Error_Syntax' with message 'Unknown "ifBONUS_CARD_ENABLE" tag in "default/template/product/product.twig" at line 45.' in /home/wpdemosystem/public_html/system/library/template/Twig/Parser.php:178 Stack trace: #0 /home/wpdemosystem/public_html/system/library/template/Twig/Parser.php(100): Twig_Parser->subparse(NULL, false) #1 /home/wpdemosystem/public_html/system/library/template/Twig/Environment.php(619): Twig_Parser->parse(Object(Twig_TokenStream)) #2 /home/wpdemosystem/public_html/system/library/template/Twig/Environment.php(671): Twig_Environment->parse(Object(Twig_TokenStream)) #3 /home/wpdemosystem/public_html/system/library/template/Twig/Environment.php(396): Twig_Environment->compileSource('{{ header }}\r\n<...', 'default/templat...') #4 /home/wpdemosystem/public_html/system/library/template/twig.php(33): Twig_Environment->loadTemplate('default/templat...') #5 /home/wpdemosystem/public_html/system/library/template.php(51): Template\Twig->render('default/templat...', '0') #6 /ho in /home/wpdemosystem/public_html/system/library/template/Twig/Parser.php on line 178

You need a space between "if" and your custom constant BONUS_CARD_ENABLE.

Also, I'm not sure if you can use constants that way in Twig. If it doesn't work, then use a normal variable instead. You'd do that by adding a line like this in the /catalog/controller/product/product.php file:


filling in the data for that variable on the right-half of that equation. Then, you can use it in the .twig file like this:

You can use constants in twig, but it should be like this: