How to quickly understand loop statements (detailed introduction)

The last article introduced you to "Detailed introduction to PHP - multiple branch structures". This article continues to introduce you to process control - loop structure. Don't hesitate to come in and learn! You will definitely gain something! ! !

Loop structure:

What is a loop: It is to let the computer execute one thing repeatedly;

while loop:

Format:

##while (conditional expression) {

//Loop body

PHP code

Self-increment or self-decrement conditions

}

Note: When writing a loop structure, you generally need to automatically The conditions for increase and decrease;

We use code to show the specific format. The code is as follows:

<?php 
/******while 循环  循环格式1******/
/*
   while循环叫做布尔值循环
   while（）内的表达式如果为真则执行循环体{}内的就叫做循环体
   如果为假，停止循环
*/
//1.初始化一个变量
 $num = 10;
 while($num >0){
     echo $num.&#39;&#39;;
     //每次循环执行完毕后，条件变量进行改变
     $num --;
 }
?>

The running result is:

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