What is the most convenient service (site) for comparing the syntax of programming languages?

Question

Programming languages

For example, a programmer knows JS and wants to understand PHP, or vice versa. In such a service, it finds the item "array concatenation" somewhere and looks at the difference, with examples. But in any language, not specifically these two.

Answer 1

I have only found one site.
hyperpolyglot.org

Answer 2

There is Derek Banas , who has a fairly large list of languages, at least he gives similar examples when talking.

Answer 3

The example contradicts the problem. If a programmer wants to learn php knowing js, he doesn't need sites with syntax for Smalltalk. He can google something like "php for javascript developers" and find a dedicated article.
I know that there are sites comparing different languages ​​like helloworldcollection.de but the syntax of all all languages ​​is deeply discussed there. Different languages ​​may not only have different syntax, but also different concepts. Those. maybe something that is simply not in another language. Different languages ​​have different libraries and different idioms. For this example, I would suggest reading an article like the one I gave and a book on php, scrolling through what is already clear.

Answer 4

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