tpl模板引擎和使用

tpl.php<?php
namespace tpl;
/*** Class Tpl*/
class Tpl
{protected $view_dir;//模板文件protected $cache_dir;//缓存文件protected $lifetime;//过期时间protected $vars = [];//存放显示变量的数组/*** Tpl constructor.* @param string $view_dir* @param string $cache_dir* @param string $lifetime*/public function __construct($view_dir='', $cache_dir='', $lifetime=''){//如果模板文件不为空，则设置，为空则为默认值if (!empty($view_dir)) {if ($this->check_dir($view_dir)) {$this->view_dir = $view_dir;}}//如果缓存文件不为空，则设置，为空时为默认值if (!empty($cache_dir)) {if ($this->check_dir($cache_dir)) {$this->cache_dir = $cache_dir;}}//如果过期时间不为空，则设置，为空时为默认值if (!empty($lifetime)) {$this->lifetime = $lifetime;}}/*** 对外公开的方法* @param string $name* @param string $value*/public function assign($name, $value){$this->vars[$name] = $value;//将传入的参数以键值对存入数组中}/*** 测试文件* @param $dir_path* @return bool*/protected function check_dir($dir_path){//如果文件不存在或不是文件夹，则创建if (!file_exists($dir_path) || !is_dir($dir_path)) {return mkdir($dir_path, 0777, true);}//如果文件不可读或不可写，则设置模式if (!is_writable($dir_path) || !is_readable($dir_path)) {return chmod($dir_path, 0777);}return true;}/*** 展示方法* @param $view_name* @param bool $isInclude* @param null $uri*/public function display($view_name, $isInclude=true, $uri=null){//通过传入的文件名，得到模板文件路径$view_path = rtrim($this->view_dir, '/') . '/' . $view_name;//判断路径是否存在if (!file_exists($view_path)) {die('文件不存在');}//通过传入的文件名得到缓存文件名$cache_name = md5($view_name . $uri) . '.php';//缓过缓存文件名得到缓存路径$cache_path = rtrim($this->cache_dir, '/') . '/' .$cache_name;//判断缓存文件是否存在，如果不存在，重新生成if (!file_exists($cache_path)) {$php = $this->compile($view_path);//解析模板文件file_put_contents($cache_path, $php);//缓存文件重新生成} else {//如果缓存文件存在，判断是否过期，判断模板文件是否被修改$is_time_out = (filectime($cache_path) + $this->lifetime) > time() ? false : true;$is_change = filemtime($view_path) > filemtime($cache_path) ? true : false;//如果缓存文件过期或模板文件被修改，重新生成缓存文件if ($is_time_out || $is_change) {$php = $this->compile($view_path);file_put_contents($cache_path, $php);}}if ($isInclude) {extract($this->vars);//解析传入变量的数组include $cache_path;//展示缓存}}/*** 正则解析模板文件* @param string $file_name* @return mixed|string*/protected function compile($file_name){$html = file_get_contents($file_name);//获取模板文件//正则转换数组$array = ['{$%%}' => '<?=$\1?>','{foreach %%}' => '<?php foreach (\1): ?>','{/foreach}' => '<?php endforeach ?>','{include %%}' => '','{if %%}' => '<?php if (\1): ?>','{/if}' => '<?php endif ?>','{for %%}' => '<?php for (\1): ?>','{/for}' => '<?php endfor ?>','{switch %%}' => '<?php switch (\1) ?>','{/switch}' => '<?php endswitch ?>'];//遍历数组，生成正则表达式foreach ($array AS $key=>$value) {//正则表达式，$pattern = '#' . str_replace('%%', '(.+?)' , preg_quote($key, '#')) . '#';if (strstr($pattern, 'include')) {$html = preg_replace_callback($pattern, [$this, 'parseInclude'], $html);} else {$html = preg_replace($pattern, $value, $html);}}return $html;}/*** 处理include表达式* @param array $data* @return string*/protected function parseInclude($data){$file_name = trim($data[1], '\'"');$this->display($file_name, false);$cache_name = md5($file_name) . '.php';$cache_path = rtrim($this->cache_dir, '/') . '/' . $cache_name;return '<?php include "'.$cache_path.'" ?>';}
}

user_tpl，，，，从数据库中取值，作为参数传到模板文件，再解析模板文件
<?php
include './sql/pdo.sql.php';
include 'tpl.php';$tpl = new tpl\Tpl('./view/', './cache/', 3000);
$link = new pdo_sql();
$dat = ['menu_name', 'menu_url'];
$res = $link->table('blog_menu')->field($dat)->order('id ASC')->select();
$tpl->assign('menu', $res);
$tpl->display('index.html');