sql语句变量加{}有什么用

Question

 $sql="insert user(username,password,age)" values ('{$username}','{$password}','{$age}')";

Answer 1

我们的spring mvc框架就必须向图中这么写

Answer 2

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

Answer 3

php中双引号下加花括号可以解析变量，这你都不知道呀～你out 了～哈哈

Answer 4

{}是框架的定界符,{$va}相当于<?php  echo $va  ?>;

Answer 5

用于取值，将值放到''中去