MVC is a development model that emphasizes the forced separation of data input, processing, and display.

Smarty usage tutorial
1. How to configure our smarty
After unzipping, place the libs folder in the first-level directory of the website, and then create two folders
templates stores template files
templates_c stores compiled files
Create the initialization file smarty.ini.php again

Note:
1. Generally use <{}>
as the identifier separator for replacement variables. Two ways to change the delimiter:
1. Change the source code: Smarty.class.php $left_delimiter Not recommended
2. Dynamic modification:
$Smarty->left_delimiter="<{";
$Smarty->right_delimiter="}>";
written before display

2.smarty allocates data
$smarty->assign("Address",$address);
Used to assign values ​​to templates. You can specify a name/number pair or an associative array containing name/numbers.
$smarty->assign("aa",true); //Output 1
$smarty->assign("aa",false); //Output is empty