How to use define to define constants in php

This article mainly introduces how to use define to define constants in PHP. Interested friends can refer to it. I hope it will be helpful to everyone.

The details are as follows:

<?php
/*
 * define
 * */
 /*第3个参数：
 * false -- 对大小写敏感（默认）
 * true -- 对大小写不敏感
 * */
 define("pai",3.14);
 define ("name","LiLei",true);
 function testfor($x) {
  for($a=$x;$a<=12;$a++) {
    echo "现在是$a 点：";
    if($a<9) {
      echo "敲代码";
      echo name;
    } else {
      echo "睡觉";
      echo pai;
    }
    echo "<br />";
  }
 }
 testfor(10);
?>

The running results are as follows:

It is 10 o'clock now: sleeping 3.14
It is 11 o'clock now: sleeping 3.14
It’s 12 o’clock now: sleep 3.14

Summary: The above is the entire content of this article, I hope it will be helpful to everyone’s study.

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