Javascript closure-is the closure function in php different from the anonymous function? what is a closure?

What is a closure? I have heard about this in js before, but how do I feel I have never used this concept in actual development? I just recently learned about laraval and found that all route configurations use closure functions (this is described in the tutorial). What does this closure mean? I think what is the closure in code and js? I have heard about this in js before, but how do I feel I have never used this concept in actual development? I just recently learned about laraval and found that all route configurations use closure functions (this is described in the tutorial). What does this closure mean? I think the code is similar to the anonymous function in js? Thank you for your answers •﹏•

Reply content:

What is a closure? I have heard about this in js before, but how do I feel I have never used this concept in actual development? I just recently learned about laraval and found that all route configurations use closure functions (this is described in the tutorial). What does this closure mean? I think the code is similar to the anonymous function in js? Thank you for your answers •﹏•

Closures are a free block of code. In most languages, closures are basically represented in the form of anonymous functions. in PHP and Js, anonymous functions can be understood as closures, the two are the same. Of course, in PHP, there are Closure objects to operate on closures.