Php updating a static variable

Posted by / 23-Sep-2019 16:07

Php updating a static variable

Without the '&', the anonymous function gets the value of $fib at the time the function is being created.But until the function has been created, $fib can't have it as a value!It's not until AFTER the function has been assigned to $fib that $fib can be used to call the function - but by then it's too late to pass its value to the function being created!Using a reference resolves the dilemma: when called, the anonymous function will use $fib's current value, which will be the anonymous function itself.That means, you can use the same name for a constant, for a property and for a method at a time.Since a property can be also an anonymous function as of PHP 5.3.0, an oddity arises when they share the same name, not meaning that there would be any conflict.

This provides for great event handlers, accumulators, etc., etc.And I tried 10 million loop iterations, in PHP 7.0.14 from Dec 2016.Result:a single saved closure kept in a variable and re-used (10000000 iterations): 1.3874590396881 secondsnew anonymous closure created each time (10000000 iterations): 2.8460240364075 seconds In other words, over the course of 10 million iterations, creating the closure again during every iteration only added a total of "1.459 seconds" to the runtime.Includes a method which// calculates the total price of the items in the cart using a// closure as a callback.Watch out when 'importing' variables to a closure's scope -- it's easy to miss / forget that they are actually being *copied* into the closure's scope, rather than just being made available.

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