CODEWITHSUNDEEP
phplaravel
Gabriel Genoni
Gabriel Genoni

Reputation: 1

I have a few questions about how Laravel works

I hope you are well. I am currently learning Laravel 8, and am of course encountering some small complications while learning. I would like to understand the following:

What does "{{ ... }}" mean? I understand the principle, of putting PHP in HTML, but how does it work? What does the "{{ }}" mean?

What does "@if", "@foreach" mean? I also understand the principle of putting a conditional aspect within a file, but what does "@" represent?

I have a particular problem, and when I search on the internet, I quickly come across PHP version problems (and I confess I don't believe it):

For example, I make a complete pagination system, and when I set up a foreach to set up my page numbers, it returns me an error:

@if ($paginator->hasPages())
<ul class="pagination">

    @foreach ($elements as $element)
        @if (is_string($element))
            <li class="page-item disabled"><span class="page-link">{{ $element }}</span></li>
        @endif
        @if (is_array($element))
            @foreach ($element as $page => $url)
                <li class="page-item">
                    <a href="{{ $url }}" class="page-link">{{ $page }}</a>
                </li>
            @endforeach
        @endif
    @endforeach

</ul>
@endif

  Now, if I put this:

@if ($paginator->hasPages())
<ul class="pagination">

    @foreach ($elements as $element)
        @if (is_string($element))
            <li class="page-item disabled"><span class="page-link">{{ $element }}</span></li>
        @endif
        @if (is_array($element))
            @foreach ($element as $page => $url)
                <li class="page-item">
                    <a href="{{ $url  ?? '' }}" class="page-link">{{ $page  ?? '' }}</a>
                </li>
            @endforeach
        @endif
    @endforeach

</ul>
@endif

Now it works properly. If I replace the elements like the first text quote, then it's no longer a problem...

Could it be the cache? From the update of the server pages without restarting it with Laravel 8?

I thank you in advance for your help. I come here as a last resort, without knowing what to write on the internet, without finding a very logical and coherent answer...

Thanks 🙏

Typical example of an error that I have right away:

ParseError
syntax error, unexpected ' ' (T_STRING), expecting ')' (View: /Applications/MAMP/htdocs/Laravel/Site/resources/views/vendor/pagination/custom.blade.php)

In the code, I wrote this:

@if ($paginator->onFirstPage())
    
@else
    <li class="page-item">
        <a href="{{ $paginator->previousPageUrl() }}" rel="prev" class="page-link">
            Précédent
        </a>
    </li>
@endif

For it to work I have to put : {{ $paginator->previousPageUrl() ?? '' }}

Upvotes: 0

Views: 61

Answers (1)

Adrian Kokot
Adrian Kokot

Reputation: 3201

Blade templates

Those "{{ ... }}" and "@" are just statements by which laravel template engine called blade knows what to do with provided statement.

You can read documentation of blade here.

Blade's {{ }} echo statements are automatically sent through PHP's htmlspecialchars function to prevent XSS attacks.

"{{ ... }}" is called echo statement. So:

{{ $variable }}

is translated to something like this:

<?php echo htmlspecialchars($variable )?>

@if, @for, @foreach are replaced to something like this:

<?php foreach($variable as $key => $value) { ?>
// template that you put inside
<?php } ?>

and so on.

Null coalescing operator

Errors with your functions that you claim that you have to put ?? '' are caused that probably value of function / function itself is null.

The ?? operator checks for nulls (what you can read here):

The null coalescing operator (??) has been added as syntactic sugar for the common case of needing to use a ternary in conjunction with isset(). It returns its first operand if it exists and is not null; otherwise it returns its second operand.

Upvotes: 3

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