从数据库查询数据，浏览器以表格形式显示

注意区别index 和iteration

index为数组下标索引

iteration为序号

模板页面

用户信息表
            index
            iteration
            <{foreach $tdname as $val}>
                            <{$val}>
            <{/foreach}>
            <{section name="one" loop=$users step=2 start=2}>        
                    <{if $smarty.section.one.first}>
                            
                    <{elseif $smarty.section.one.last}>
                            
                    <{elseif $smarty.section.one.iteration is even}>
                            
                    <{else}>
                            
                    <{/if}>                    
                                <{$smarty.section.one.index}>
                                <{$smarty.section.one.iteration}>
                                <{$users[one].id}>
                                <{$users[one].username}>
                                <{$users[one].password}>
                                <{$users[one].email}>
                    
                    <{sectionelse}>
                    没有用户查询出来！
            <{/section}>

php页面

left_delimiter="<{";
$smarty->right_delimiter="}>";
//设置为false 定界符号左右可以有空格
$smarty->auto_literal = false;

//添加一个插件的目录
//$smarty->setPluginsDir(ROOT."/libs/myplugins/");

//注意添加一个插件,要把系统默认设置的路径加入 否则不能使用默认系统的插件
$smarty->setPluginsDir(array(
    ROOT."/libs/plugins/",//系统默认设置的路径
    ROOT."/libs/myplugins/",//自定义的
));

//连接数据库
const  DSN = 'mysql:host=localhost;dbname=test';
const   DBUSER = 'root';
const   DBPWD     = 'root';
try{
    $pdo = new PDO(DSN, DBUSER,DBPWD);
}catch(PDOException $e){
    echo "数据库连接失败:".$e->getMessage();
    exit;
}
$query = "select id, username, password,email from users";
$stmt = $pdo->prepare($query);
$stmt ->execute();
$users = $stmt->fetchAll(PDO::FETCH_ASSOC);
$smarty->assign('users',$users);
//var_dump($users);

$query = "desc users";
$stmt = $pdo->prepare($query);
$stmt ->execute();
$tdname = $stmt->fetchAll(PDO::FETCH_COLUMN);
//var_dump($tdname);

$smarty->assign('tdname',$tdname);


//变量输出
$smarty->display('hello.tpl');

?>

浏览器输出