Is there a neat way to initialize a variable used in a closure? …does not work An example use case is for array_reduce where we might want to count the array elements… This will work – declaring $count by reference and incrementing from null will not yield an error – but I don’t …
Tag: anonymous-function
What exactly is the difference between an anonymous function and a static anonymous function in PHP?
Basically the purpose of the static keyword is totally clear to me, the PHP docs only explain the purpose of the keyword in the context of classes. I noticed one of my IDE plugins suggesting me that I should declare many of my callback functions as static. Without static: With static: For the result it does n…
Rewriting an anonymous function in php 7.4
There is the following anonymous recursive function: I try to rewrite to version 7.4, but there is an error, please tell me what I’m missing? Notice: Undefined variable: f Fatal error: Uncaught Error: Function name must be a string Answer Just like Barmar said, you can’t use $f from the outside sc…
PHP 7.2 Function create_function() is deprecated
I have used create_function() in my application below. But for PHP 7.2.0, create_function() is deprecated. How do I rewrite my code above for PHP 7.2.0? Answer You should be able to use an Anonymous Function (aka Closure) with a call to the parent scoped $delimiter variable, like so:
What is the scope of a PHP function defined within a PHP anonymous function?
Question If I do this: 1) Is it legal PHP? And … 2) Is the function lengthTest() in the global namespace, or limited to just the $checkName Closure object? Would it be a private member, then? 3) Can lengthTest() be refereced as a callback method for filter_var_array() like this? 4) Can lengthTest be ref…
Anonymous functions in WordPress hooks
WordPress hooks can be used in two ways: using callback function name and appropriate function using anonymous function (closure) Is there any difference for WordPress what way to use? What is prefered way and why? Answer The disadvantage of the anonymous function is that you’re not able to remove the a…
Which version of php added anonymous functions
In manual there is create_function function and you can pass result from that function to array_map, I thought that that is the only way to have something like anonymous functions and closures, but then I found that I can just put function like in javascript In which version of php I can do this? Was this alw…