Node Vs PHP

PHP is advisable for making high-level web applications because It has a huge community. PHP has an experienced guidance because of the huge development era. That is why you can get any solution for your problem very easily.
It is a deep code based, means most of the Content Management Systems (like Joomla, WordPress, Magento, Drupal) are purely PHP based.

PHP is more common for hosting providers. This is because there is no compatibility issue to make application live on the server. The simplicity of the PHP code, it can run as HTML by changing extension of it.
No jar, preprocessor, no compiler and deployment dependency exists.
You can add php anywhere in your code by just using tag , that makes PHP more flexible.

Now, the trend is going in a way that most of the Startups are not using PHP as their Tech Stack because,
It is relatively slower than the advanced server-side development competitors like Node.
Since it is open sourced, so anyone can access it. If there are bugs in the source code, it can be used by people to explore the weakness of PHP.
It is not suitable for making larger applications; it is ideally suited for e-commerce based applications.

Most of the Startups are prioritizing Node over other monolithic stacks like PHP, or Ruby on Rails, because
Extraordinary faster than PHP because of the event callback mechanism.
Primarily, it has single-threaded mechanism, but you can also scale Node app on multi-core system. For more information about scaling, see my other article.
It has separation of concerns, i.e, separate modules for any operation.
Node.JS is popular, new and fresh.
It uses callback structure to pass logic from one call to another.
Less or relatively no chances of occurrence of deadlock mechanism.
It can use the single as well as multi-threaded application
Anyone with another platform background can jump to Node. It has numerous frameworks which can be used as an alternate for other frameworks like Ruby on Rails. Check out my article on top Node Frameworks.

Although, Node is providing the best possible solution, but there are always two sides of the mirror. Wisely think when making a Node application because
Node is not suitable for processor intensive tasks.
Any CPU-intensive code makes it really non-scalable.
Node or PHP, Can we use One over Another

• Node is suitable for complex applications that need powerful processing, while PHP is best suited for CMS based or e-commerce applications.
• Node.JS uses JavaScript as front-end as well as back-end language while PHP has to depend on some front-end framework or language.
• Node application is proven to be much faster than PHP.
• PHP has a lot of mature tools and libraries available than Node.
• Node has more hosting service provider than PHP.
• Node application only runs on dedicated host server while PHP application runs on shared host servers.
• I think Node and PHP both of them are trying their best to cope up their downsides. It is the fact that no man can serve two masters. Likewise, you have to opt one definite way. PHP can be used preferably or Node.JS is taking the place of PHP is totally a myth.
• Only speed issue in PHP can not judge the whole scenario because php7 is released with its alpha version. Soon it is coming up with stable version with Zend engine which is an open source scripting engine that interprets PHP code.
• It is used as a compiler/runtime engine that boosts up the performance issue twice than PHP5. See Will PHP 7 be able to compete with node.js.

Apart from all the stuff I have written, I noticed few of the startups that were proudly announced their platform as PHP, are now turning their architecture to Node.
The reason is not the speed/performance issue, but most of the startups are considering Node because it is new and popular and new means, according to the latest requirements and new features.
Node ensures you same stack, i.e., JavaScript for front-end as well as backend code.
Shifting from PHP to Node is not as easy as it looks like, because PHP has lead of all the hosting servers.
A developer at Medium want to shift from PHP. He said that on top of all the popular alternatives to PHP there is a relatively new kid on the block called Node.js. Node never seemed like it would be a realistic competitor to the big languages when it came to writing complete server side code; it was just to new and unproven.
Note: There is a buzz that WordPress is switching from PHP to Node. However, let me clear, as per my research I did not get one reason for WordPress to shift their architecture to Node because all the plugins are full-fledged PHP based. They only changed their front end UI and wp-admin(dashboard) code to React.JS and calypso.
Flipkart

Flipkart was initially built on the PHP stack with HTML, CSS at frontend. They wanted to move from PHP to pure javascript oriented approach. They just wanted to turn for improvement and turned their overall architecture to Node.JS.
Conclusion

Both PHP and Node are the hottest languages of today. Use PHP for any e-commerce based application and Node for making highly scalable application, like chatting apps, or any apps that use rest services as a backend.