![]() There is also an await keyword, which is used to suspend the execution of the code that follows the statement, even if it is doing something asynchronous like waiting for some IOs or network connections etc. It introduced the async keyword which you can assign to functions to tell that it can be executed asynchronously. Hack made it easy to do asynchronous programming cleanly, and also without the pain of callbacks used by JavaScript solutions. ![]() Thus, synchronous programming is often a waste of performance. Each one will hold your script for as long as the servers take to respond. Imagine a script that collects information from different sites. With synchronous programming each task can only be started after the previous task has finished. ![]() Also, PHP has limited support for asynchronous programming, and it does not provide a clean and consistent solution. Traditionally PHP executes those tasks and waits for them to finish before it returns the control to your script. These tasks are usually input/output operations that rely on operations that are run by separate servers or other OS processes. Asynchronous programming allows a script to run multiple tasks in parallel.
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