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You can assign the array directly to the hash to get half of the pairs. Use an array slice to get the other half.

People often get lists and arrays confused in Perl. So calling an array variable @list is a really bad idea :-)

As I mentioned in a comment, you seem to be confused about how you populate an array in Perl. You either populate it with a list:

Try splitting on one or more whitespace characters instead of a single whitespace character:

A Schwartzian transform is a way to avoid computing the sorting keys too many times, like in the solution - the one with the local ($a,$b)

The steps of a S. tranform are basically:

• use a Map to enrich the list elements with computed sorted keys. Here, %h is used as the new element, containing the original line as line
• use a Sort to sort this rich list. The sort with a bit of dirty $a $b magic.
• use a Map to extract the original list elements. Here by extracting the line key.

A note on $a $b

Very sadly, $a and $b are global variables in Perl. They usually get automagically assigned inside a sort block. Like in sort { $a <=> $b } (3,2,1)

This explains why the S. solution works even though the compared elements are not given as arguments to the sorting subs. And it also explains the need for local (another Perl horror to pretend a global variable is local) so the naive solution's sort function get the right values in $a, $b.

I strongly encourage you to forget about this and avoid implicit use of $a , $b deeper than the sort block itself.

A slightly more understandable version would be:

You have two problems:

• You have Symfony '5.3' installed, which was released just one day ago.
• You are using PHP 8, which is not supported by Sylius. By using PHP 8, you end up installing versions of dependencies that are not compatible with Sylius.

Since the current version of Sylius supports up to 5.2, and PHP ^7.3, you'll have to either downgrade to Sf 5.2 and PHP >= 7.3 && PHP < 8, or wait a some time so support for Sf 5.3 and PHP >= 8 is baked in.

I would recommend using the standard Sylius installation, but trying to install Sylius with the recommended docs way (composer create-project sylius/sylius-standard acme) when using PHP 8 also fails. But downgrading to PHP 7.4 and running the create-project command does work.

The project seems to have entered the dependency hell stage of development.

Let's start by avoiding needless copies of hashes and arrays. We're also going to use better variable names than AoH, href and key.

display them randomly by three top data when reload page.

You can select three random items from the product list by using for example List::Util::shuffle(). Example:

I could able to replicate the issue which you have mentioned in the question.

Just declare $h_protocol FH inside the print_protocol() sub. And remove it from line 12.

So your code in sub would look like this.

This turned out to be a compatibility issue with Composer 2.x. I downgraded to the 1.x channel using composer self-update --1, then ran composer install again, and the installation succeeded.