There are lots of similarities between PHP and Node.js, while PHP is all about blocking API, Node.js implements non-blocking approach. If we put aside this main difference, Node.js is very similar to PHP in terms of language constructs etc.
Looking at the history of PHP, it was launched in year 1995 and slowly it gained prominence, now even after the launch of so many languages PHP is still the preferred and the most widely deployed web application environment in the world.
Coming to Node.js, it has a recent history, launched in the year 2009, Node gained prominence much quickly, currently Node is preferred for enterprise web applications where latency is matter of concern, using Node.js non-blocking approach we can design applications which can handle thousands of concurrent connections.
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