常量就是一个普通的只读变量

abstract：<?php/** * Created by PhpStorm. * User: Administrator * Date: 2018/11/28 * Time: 13:35 */$brank = '张喜望';$brank1 = '孙洪凯';echo $brank;echo '<hr>';function cooking1($food

<?php
/**
* Created by PhpStorm.
* User: Administrator
* Date: 2018/11/28
* Time: 13:35
*/
$brank = '张喜望';
$brank1 = '孙洪凯';
echo $brank;
echo '<hr>';
function cooking1($foods)
{
   return '张喜望一口一口的喂孙洪凯' .$foods;
}
echo cooking1('屎');
echo '<hr>';
function cooking2($foods='粑粑')
{
   return '张喜望一口一口的喂孙洪凯' .$foods;
}
echo cooking2();
echo '<hr>';
$foods = '狗屎';
echo cooking2($foods);

Correcting teacher：韦小宝Correction time：2018-11-28 17:00:07
Teacher's summary：我去， 你这案例真是重口味啊！有点意思！课后记得多多练习哦！