reduce arguments by reference

[marc-mabe]

This PR reduces arguments by reference often used on internal methods.

It was previously done as performance improvement but in fact it decreases performance as PHP have to create a new zval and in some cases it needs to copy the value before PHP-7 as described here: http://nikic.github.io/2015/05/05/Internal-value-representation-in-PHP-7-part-1.html

Additionally arguments by reference make the code more error prone and hard to read.

[Maks3w]

I'll suggest to open a issue for each idea so we could discuss over each one separately.

[marc-mabe]

@Maks3w I have changed the title and description on this PR. Will open new for the other ideas.

[Maks3w]

@marc-mabe Thanks. Tiny objectives make it more easy to be approved and merged.

[Maks3w]

/cc @weierophinney Is this the kind of cosmetic changes you want?

[marc-mabe]

related to #67

[weierophinney]

This repository has been closed and moved to laminas/laminas-cache; a new issue has been opened at laminas/laminas-cache#14.

[weierophinney]

This repository has been moved to laminas/laminas-cache. If you feel that this patch is still relevant, please re-open against that repository, and reference this issue. To re-open, we suggest the following workflow:

• Squash all commits in your branch (git rebase -i origin/{branch})
• Make a note of all changed files (`git diff --name-only origin/{branch}...HEAD
• Run the laminas/laminas-migration tool on the code.
• Clone laminas/laminas-cache to another directory.
• Copy the files from the second bullet point to the clone of laminas/laminas-cache.
• In your clone of laminas/laminas-cache, commit the files, push to your fork, and open the new PR.
  We will be providing tooling via laminas/laminas-migration soon to help automate the process.