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php shopping cart oop mvc paypal

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This is the error I keep getting when clicking the add to cart button on the product of choice.
Fatal error: Uncaught Error: [] operator not supported for strings in C:\xampp\htdocs\phpcartoopmvc-projectfiles\app\models\m_products.php:172 Stack trace: #0 C:\xampp\htdocs\phpcartoopmvc-projectfiles\app\models\m_cart.php(162): Products->get_prices(Array) #1 C:\xampp\htdocs\phpcartoopmvc-projectfiles\app\init.php(51): Cart->get_total_cost() #2 C:\xampp\htdocs\phpcartoopmvc-projectfiles\index.php(3): include('C:\\xampp\\htdocs...') #3 {main} thrown in C:\xampp\htdocs\phpcartoopmvc-projectfiles\app\models\m_products.php on line 172

could the constants I have set be part of the problem?



Screenshot 2021-07-17 234852.png

Edited by Shad76
showing image of product buttons that cause error
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