What does the following code mean?
$shipping_modules = new shipping($shipping);
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The new instance of class
shippingis assigned to variable$shipping_modulesthere by allowing you to access class methods/properties. Finally,$shippingvariable is passed to the constructor ofshippingclass.where:
shippingclass to$shipping_modulesvariablenewoperator to create instance of the classshipping$shippingpassed to constructor of the class.See PHP OOP Tutorial