PHP a self-invocation (recursive) case Analysis _php technique based on closed-Package implementation function

This article illustrates the method of PHP's self invocation (recursion) based on the closure implementation function. Share to everyone for your reference, specific as follows:

PHP closures may not be common, but in some cases you might consider using a PHP closure to implement certain functions, such as recursion, where you can implement recursion with PHP closures

PHP Closure implementation function of the call, that is, implementation of recursive function
closure ($n, $counter, $max) {
  //anonymous functions, where the function of the parameter plus & symbol is, the address call parameters themselves
  $FN = Functions (& $n,& $counter,& $max =1) use (& $FN) {//use parameters are passed by the function closure function itself
    $n + +;
    if ($n < $max) {//recursive point, which is the conditional $counter of recursion
      . = $n. ' <br/> ';
      Recursively calls itself
      $fn ($n, $counter, $max);
    return $counter;
  };/ /Remember there must be a '; ' semicolon, no semicolon. PHP will complain, closure function/
  * Here function closure return value is to call the closure of the anonymous function
  * and the closure function, referencing the closure function to pass in the parameters *
  * Return
  $FN ($n, $counter, $max);
Echo (Closure (0, ', 10));

This is a simple use of PHP closure to achieve recursion function, in fact, if we modify the function slightly, can achieve a lot of functions, such as the infinite Polar classification.

On the inside of the closure function, in fact, we can also not refer to the outside of the closure parameter, the inside of the closure function parameters, we can set in the closure.

We can also not return the value of the closure function, because the closure function is in the closure function, we can set the variable in the closure to pass to the closure function, and then, with the closure recursive to get what we want to store in the array, And then use the closure function to return the closure function to get something, so the closure function can also have no return value, the key is what you want to get.

In short, you just use the closure function to implement what you want, and then return what you need, not necessarily from the return value of the closure function.

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I hope this article will help you with the PHP program design.