How to pass parameters in a Symfony route?

@dedrick 

In Symfony, you can pass parameters in a route using placeholders in the route path. These placeholders are defined by enclosing a variable name with curly braces ({}) and can be used to capture and extract values from the URL.

Here's an example of a route with a placeholder for a product_id parameter:

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use SymfonyComponentRoutingAnnotationRoute;

/**
 * @Route("/product/{product_id}")
 */
public function showProduct($product_id)
{
    // ...
}

In this example, the {product_id} placeholder is used to capture a value from the URL and pass it as an argument to the showProduct method.

You can also specify requirements and defaults for a parameter by adding a regular expression pattern and a default value inside the placeholder. Here's an example:

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/**
 * @Route("/product/{product_id<d+>}", defaults={"product_id"=1})
 */
public function showProduct($product_id)
{
    // ...
}

In this example, the product_id parameter is restricted to only accept numeric digits (d+) and a default value of 1 is provided if the parameter is not present in the URL.

To generate a URL with parameters, you can use the path function in Twig or the generateUrl method in a controller:

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<a href="{{ path('product_show', {'product_id': 123}) }}">View product</a>

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$url = $this->generateUrl('product_show', ['product_id' => 123]);

In both cases, the product_id parameter is passed as an associative array to the function or method, and the URL is generated with the correct value.