One trend that developers are taking advantage of is the use of anonymous functions. One classic problem, when dealing with anonymous functions, is to write them in such a way that any object can be bound to
$this and the function will still work. The approach used in PHP 5 code is to use
bindTo(). In PHP 7, a new method,
call(), was added, which offers similar functionality, but vastly improved performance.
To take advantage of
call(), execute an anonymous function in a lengthy loop. In this example, we will demonstrate an anonymous function, that scans through a log file, identifying IP addresses sorted by how frequently they appear: