[5.5] Prevent Blade from parsing Blade code inside the @php and @endphp blocks

[sileence]

I realised Blade is parsing "template code" inside @phpand @endphp tags.

For example this:

@php echo "{{ This is a blade tag }}" @endphp

Is compiled to:

<?php echo "<?php echo e(This is a blade tag); ?>" ?>

So with this PR I'm treating the @php and @endphp the same as the verbatim blocks, to prevent the code inside from being compiled by Blade.

Single @php tags with expression are still allowed, but I removed the compilation of individual @endphp as that doesn't make sense.

---

I have noticed there is a slight breaking change as the string @php inside a string in a Blade tag will now produce a different result:

{{ 'Im afraid this will @php end badly' }} @endphp

Now: {{ 'Im afraid this will <?php end badly' }} ?>

Before: <?php echo e('Im afraid this will <?php end badly'); ?> ?>

[browner12]

this seems weird to me. isn't this just a misuse of the @php tag that should be solved by documentation/education?

[sileence]

@browner12 personally I don't use the @php tag that often. But I think no one shouldn't expect Blade to have any effect inside PHP code.

[themsaid]

This PR broke the PHP directive, @sileence please check #20065