引用传递和值传递

引用传递

<?php
 
 function jubu($name){
     $name='张三'; 
 }
   $name='李四';
jubu($name);
echo $name; //显示李四
  
 function jubu(&$name){
     $name='张三'; 
 }
   $name='李四';
jubu($name);
echo $name; //显示张三

值传递

<?php

 $a=3;
 $b=5;
 $a=$b;!!
 echo 'a='.$a;//a=5
 echo '<br>';
 echo 'b='.$b;//b=5
 echo '<br>';
 $b=50;
 echo 'a='.$a;//a=5
 echo '<br>';
 echo 'b='.$b;//b=50
 echo '<br>';

--------------------------------
 $a=3;
 $b=5;
 $a=&$b;!!
 echo 'a='.$a;//a=5
 echo '<br>';
 echo 'b='.$b;//b=5
 echo '<br>';
 $b=50;
 echo 'a='.$a;//a=50
 echo '<br>';
 echo 'b='.$b;//b=50
 echo '<br>';