In Twig, check if a specific key of an array exists
arrays, conditional-statements, php, short-circuiting, twig
Solution
Twig example:
{% if array.key is defined %}
// do something
{% else %}
// do something else
{% endif %}
Problem
In PHP we can check if a key exists in an array by using the function `array_key_exists()`. In the Twig templating language we can check if an variable or an object's property exists simply by using an `if` statement, like this: ``` {% if app.user %} do something here {% else %} do something else {% endif %} ``` But how do we check if a key of an array exists using Twig? I tried `{% if array.key %}`, but it gives me an error: ``` Key "key" for array with keys "0, 1, 2, 3...648" does not exist ``` As one of the primary ways of passing data into a template is using arrays, it seems like there should be some way of doing this. Any thoughts?