“Begins with” in Twig template

Question

I have a twig template where I would like to test if an item begins with a certain value

{% if item.ContentTypeId == \'0x0120\' %}
    

        

Answer 1

You can always make your own filter that performs the necessary comparison.

As per the docs:

When called by Twig, the PHP callable receives the left side of the filter (before the pipe |) as the first argument and the extra arguments passed to the filter (within parentheses ()) as extra arguments.

So here is a modified example.

Creating a filter is as simple as associating a name with a PHP callable:

// an anonymous function
$filter = new Twig_SimpleFilter('compareBeginning', function ($longString, $startsWith) {
    /* do your work here */
});

Then, add the filter to your Twig environment:

$twig = new Twig_Environment($loader);
$twig->addFilter($filter);

And here is how to use it in a template:

{% if item.ContentTypeId | compareBeginning('0x0120') == true %}
{# not sure of the precedence of | and == above, may need parentheses #}

I'm not a PHP guy, so I don't know how PHP does regexes, but the anonymous function above is designed to return true if $longString begins with $startsWith. I'm sure you'll find that trivial to implement.