How to implement recursive method in php

How to implement the php recursive method: 1. Implement it through static variables, code such as "function loop(){...}"; 2. Implement it through global variables, code such as "function loopGlobal() {...}"; 3. Implemented by passing parameters by reference, code such as "function loopReference(&$i=0){...}".

The operating environment of this tutorial: Windows 7 system, PHP version 8.1, Dell G3 computer.

How to implement recursive method in php?

Three commonly used techniques for recursion:

Static variables, global variables, references

One static variable method

function loop(){
 static $i = 0;
 echo $i.' ';
 $i++;
 if($i<10){
     loop();
 }
}
loop();//输出 0 1 2 3 4 5 6 7 8 9

2 Global variable method

$i = 0;
function loopGlobal(){
  global $i;
 echo $i.' ';
 $i++;
 if($i<10){
    loopGlobal();
 }
}
loopGlobal();//输出 0 1 2 3 4 5 6 7 8 9

Three reference parameter passing method

function loopReference(&$i=0){
 echo $i.' ';
 $i++;
 if($i<10){
  loopReference($i);
 }
}
loopReference();//输出 0 1 2 3 4 5 6 7 8 9

Recursion is often used to deal with infinite problems. Through the above three methods combined with the actual situation, you can solve your own infinite problems by using them flexibly. question. If you're new to this, I'd love to hear your confusion in the comments.

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