Why should you opt for Node.js over PHP?
PHP uses multi-threaded, blocking I/O to carry out multiple tasks at the same time. This means, the functions are blocked till their completion, and only after the previous commands have been executed, can the new functions be initiated. That is not the case with Node.js. This scripting language has been created to produce concurrent results without blocking the I/O. It has an event-driven architecture, which allows it to carry out multiple tasks simultaneously, without blocking any function, and using callback signals to indicate completion or failure.