How to Access Dynamic Variable Names in Twig?

Accessing Dynamic Variable Names in Twig

When working with arrays of objects in Twig, it is often necessary to access variables with dynamic names. This can be achieved using a combination of template syntax and PHP functions.

Using the Attribute Function

To access a variable named placeholder{n}, where n is a variable, you can use the attribute function:

{{ attribute(invoices, 'placeholder1') }}

This will return the value of the placeholder1 variable within the current invoices object.

Using the Context Array

Alternatively, you can directly access values of the context array using bracket notation:

{{ _context['placeholder' ~ id] }}

This approach is generally preferred as it is more concise and clearer. However, it requires setting the strict_variables environment option to true to avoid runtime errors when accessing non-existent variables.

Providing Default Values

If the strict_variables option is set to true, you should use the default filter to provide a default value for non-existent variables:

{{ _context['placeholder' ~ id]|default('Default value') }}

Checking for Variable Existence

To check if a variable exists before using it, you can use the defined test:

{% if _context['placeholder' ~ id] is defined %} ... {% endif %}

This approach is more verbose than using the default filter, but it provides more explicit control over exception handling.

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