php代码不支持多维数组，注释和没有缓存功能。

php代码:
simplet.class.php
<?php
class SimpleT {
private $t_vars;
private $templates_dir;
private $templates_c_dir;
private $cache;
private $cache_dir;

public function __construct() {
$this->templates_dir = ./templates/;
$this->templates_c_dir = ./templates_c/;
$this->cache = 0;
$this->cache_dir = ./cache/;
}
public function setDir($dir, $type = template) {
if(is_dir($dir)) {
if($type == template)
$this->templates_dir = rtrim($dir, /)./;
elseif($type == template_c)
$this->templates_c_dir = rtrim($dir, /)./;
elseif($type == cache)
$this->cache_dir = rtrim($dir, /)./;
else
return false;
return true;
} else {
return false;
}
}

public function cache($time) {
if(is_numeric($time)) {
$this->cache = $time;
return true;
} else {
return false;
}
}

public function assign($var, $value = NULL) {
if (is_array($var)) {
foreach ($var as $key => $val) {
$this->t_vars[$key] = $val;
}
} else {
$this->t_vars[$var] = $value;
}
}
private function comp($filename) {
try {
if(!$fp = fopen($filename, r)) {
throw new Exception(Can not open . $filename);
}
$filesize = filesize($filename);
if($filesize <= 0) {
throw new Exception(The file size must > 0 );
}
$content = fread($fp, $filesize);
fclose($fp);
unset($fp);

$content = preg_replace("/<%=([$a-zA-Z0-9_]{1,})%>/","<?php echo $$1 ;?>", $content);
$content = preg_replace("/<%([$a-zA-Z0-9_]{1,}).loop%>/", "<?php foreach($$1 as $$1_key => $$1_val) { ?>",$content);
$content = preg_replace("/<%([$a-zA-Z0-9_]{1,}).loop(([$a-zA-Z0-9_]{1,}))%>/", "<?php foreach($$1 as $$2) { ?>", $content);
$content = preg_replace("/<%([$a-zA-Z0-9_]{1,}).loop(([$a-zA-Z0-9_]{1,}),([$a-zA-Z0-9_2881064151]{1,}))%>/", "<?php foreach($$1 as $$2 => $$3) { ?>", $content);
$content = preg_replace("/<%([$a-zA-Z0-9_]{1,}).key%>/", "<?php echo $$1_key ;?>", $content);
$content = preg_replace("/<%([$a-zA-Z0-9_]{1,}).value%>/", "<?php echo $$1_val ;?>", $content);
$content = preg_replace("/<%([$a-zA-Z0-9_]{1,})?%>/", "<?php if($$1 == true) { ?>", $content);
$content = preg_replace("/<%end%>/","<?php } ?>", $content);
$content = preg_replace("/<%##common##%>([^<%##end##%>]{0,})<%##end##%>/", "<?php /* $1 */ ?>", $content);
if (preg_match_all("/<%{([^(}%>)]{1,})}%>/", $content, $files)) {
$this->comp($this->templates_dir . $files[1][0]);
}
$content = preg_replace("/<%{([^(}%>)]{1,})}%>/", "<?php include {$this->templates_c_dir}simplet_comp_$1.php; ?>", $content);
echo $content;
$fp = fopen($this->templates_c_dir . simplet_comp_ . basename($filename) . .php, w);
if(!fwrite($fp, $content)) {
throw new Exception(Can not write content in the . $filename);
&