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Let17;s take a look at another new feature that17;s coming in 5..

What are Blade directives?

Laravel’s Blade templating language provides something called “directives”, which are custom tags—often control structures—that are prefaced with @. If you’ve ever written templates with Blade, you’re likely familiar with @if, @foreach, and so on.

In general, these control structure directive simply emulate their PHP analogs; for example, @if(condition) is exactly the same as <?php if (condition):.

Introducing the $

In 5.3, the @foreach directive is getting a bit of a superpower, in the form of a new $loop variable that will be available inside every @foreach loop.

The $loop variable is a stdClass object that provides meta information about the loop you’re currently inside. Take a look at the properties it exposes:

  • index: the 0-based index of the current item in the loop; 0 would mean “first item”
  • iteration: the 1-based index of the current item in the loop; 1 would mean “first item”
  • remaining: how many items remain in the loop; if current item is first of three, would return 2
  • count: the count of items in the loop
  • first: boolean; whether this is the first item in the loop
  • last: boolean; whether this is the last item in the loop
  • depth: integer; how many “levels” deep this loop is; returns 1 for a loop, 2 for a loop within a loop, etc.
  • parent: if this loop is within another @foreach loop, returns a reference to the $loop variable for the parent loop item; otherwise returns null

Most of this is pretty self-explanatory; it means you can do something like this:

<ul>
@foreach ($pages as $page)
   <li>{{ $page->title }} ({{ $loop->iteration }} / {{ $loop->count }})</li>
@endforeach
</ul>

But you also get a reference to parent $loop variables when you have a loop-within-a-loop. You can use depth to determine whether this is a loop-within-a-loop, and parent to grab the $loop variable of its parent. That opens up templating options like this:

<ul>
@foreach ($pages as $page)
    <li>{{ $loop->iteration }}: {{ $page->title }}
        @if ($page->hasChildren())
        <ul>
        @foreach ($page->children() as $child)
            <li>{{ $loop->parent->iteration }}.{{ $loop->iteration }}:
                {{ $child->title }}</li>
        @endforeach
        </ul>
        @endif
    </li>
@endforeach
</ul>

That’s it!



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