[5.4] Blade's @parent won't work if @section name is defined between double quotes

[dvlpp]

• Laravel Version: 5.4.6
• PHP Version: 7.0
• Database Driver & Version: N/A

Description:

Oddly, the @parent Blade directive won't work (meaning parent placeholder remains) if the @section directive is defined with double quotes.

So this code works:

@section('header')
    @parent
    header
@endsection

And this one don't:

@section("header")
    @parent
    header
@endsection

Seems that the quotes make a difference in the ManagesLayouts::$parentPlaceholder array.

Steps To Reproduce:

Just create a layout with some @section and let it be extended by a view, and try to put single and double quotes around its name.

[themsaid]

Thank you, PR submitted with a fix #17677