[PHP Learning] Six tips for using anonymous functions

This article mainly talks about six tips for using anonymous functions. It has certain learning value. Interested friends can learn it.

I have written an article about the use of closures before (click here to enter). This time I will give an in-depth summary of the in-depth usage and understanding of anonymous functions in PHP:

Anonymous functions in PHP are also called Closure functions allow specifying a function without a name. Assign the anonymous function to a variable and call it through the variable. Here is a simple example:

        

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Tip 1:Put the anonymous function in a normal function, or you can return the anonymous function. : This forms a simple closure

        

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Tip 2Reference local variables in anonymous functions (here you need to quote a php keyword use)

        

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Tip 3Return an anonymous function in a normal function

        

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Tip 4Return an anonymous function and pass parameters to the anonymous function

        

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Tips 5Use closure to change the variable value referenced by the context

        

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Based on the above input results, it is found that the following two func() both return 101 and the value has not changed. If you want to accumulate the effect, just add An & reference symbol is enough (modifications within the anonymous function will also affect external variables), modify it:

        

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Tip 6Pass the anonymous function as a parameter

        

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