Front-end PHP entry -011-variable function

Variable functions, which we also call variable functions. Briefly review the previous knowledge points:

  
 

   
  
 
   
<?php 
 
   
 $hello = ‘world‘; 
 
   
 $world = ‘你好‘; 
 
   
 //输出的结果为：你好 
 
   
 echo $$hello; 
 
   
?>
 
  
  
 

因为$hello先被解释成了world，再world前加上$符就输出了：你好。

The use of variable functions is this:

  
 

   
  

  
<?php
   
  

  
 function demo(){
   
  

  
 echo ‘天王盖地虎‘;
   
  

  
 }
   
  

  

   
  

  
 function test(){
   
  

  
 echo ‘小鸡炖蘑菇‘;
   
  

  
 }
   
  

  

   
  

  
 $fu = ‘demo‘;
   
  

  

   
  

  
 //把$fu变为了demo,把demo后加上了一个括号，就执行函数了
   
  

  
 $fu();
   
  

  

   
  

  
 //把$fu的值改为test字符串再试试？
   
  

  

   
  

  
?>
  
 

From for notes (Wiz)

Front-end PHP entry -011-variable function