默默简单的写了一个模板引擎_PHP教程

/**
* 默默基于Discuz的模板引擎开发的OOP类模板引擎，可支持模板缓存并生成hash的md5值。由hash值来判断模板是否被修改，假如被修改则重新生成缓存文件，假如没有被修改，则直接调用缓存文件.
* 版本:1.0.0.1 beta 测试版
*/
class mmtp{

var $left_tags="{";
var $right_tags="}";
var $tp_suffix=".html";
var $cache_suffix=".tpl";
var $tp_dir="./";
var $cache_dir="./";

/**
* 允许循环嵌套的次数，默认为5
*
* @var unknown_type
*/
var $nest = 5;
/**
* 模板路径
*
* @param unknown_type $tp_dir
* @return mmtp
*/

function __setdir($tp_dir){
if(file_exists($tp_dir)){
$this->tp_dir=$tp_dir;
}else{
$this->error("模板路径不存在");
}
}

/**
* 设置缓存目录
*
* @param unknown_type $cache_dir
*/
function __setcdir($cache_dir){
if(file_exists($cache_dir)){
$this->cache_dir=$cache_dir;
}else{
$this->error("缓存路径不存在");
}
}

/**
* 输出错误信息
*
* @param unknown_type $msg
*/

function error($msg){
print " ";
}

/**
* 解析模板
*
* @param unknown_type $file
*/

function tp($file){
$tp_path=$this->tp_dir.$file.$this->tp_suffix;
$fp=fopen($tp_path,"rb");
if(!$this->file_test($tp_path,"r") && !$this->match_hash($file)){
$template=$this->file_read($tp_path);

$var_regexp = "((\\\$[a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*)(\[[a-zA-Z0-9_\-\.\"\'\[\]\$\x7f-\xff]+\])*)";
$const_regexp = "([a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*)";
$template = preg_replace("/([\n\r]+)\t+/s", "\\1", $template);
$template = preg_replace("/\/s", "{\\1}", $template);
$template = preg_replace("/\{lang\s+(.+?)\}/ies", "languagevar('\\1')", $template);
$template = str_replace("{LF}", "=\"\\n\"?>", $template);

$template = preg_replace("/\{(\\\$[a-zA-Z0-9_\[\]\'\"\$\.\x7f-\xff]+)\}/s", "=\\1?>", $template);
$template = preg_replace("/$var_regexp/es", "\$this->addquote('=\\1?>')", $template);
$template = preg_replace("/\\?\>/es", "\$this->addquote('=\\1?>')", $template);


$template = preg_replace("/[\n\r\t]*\{template\s+([a-z0-9_]+)\}[\n\r\t]*/is", "\n include('".$this->cache_dir."\\1".$this->cache_suffix."'); ?>\n", $template);
$template = preg_replace("/[\n\r\t]*\{template\s+(.+?)\}[\n\r\t]*/is", "\n include('".$this->cache_dir."\\1".$$this->cache_suffix."'); ?>\n", $template);
$template = preg_replace("/[\n\r\t]*\{eval\s+(.+?)\}[\n\r\t]*/ies", "\$this->stripvtags('\n \\1 ?>\n','')", $template);
$template = preg_replace("/[\n\r\t]*\{echo\s+(.+?)\}[\n\r\t]*/ies", "\$this->stripvtags('\n echo \\1; ?>\n','')", $template);
$template = preg_replace("/[\n\r\t]*\{elseif\s+(.+?)\}[\n\r\t]*/ies", "\$this->stripvtags('\n } elseif(\\1) { ?>\n','')", $template);
$template = preg_replace("/[\n\r\t]*\{else\}[\n\r\t]*/is", "\n } else { ?>\n", $template);

for($i = 0; $i nest; $i++) {
$template = preg_replace("/[\n\r\t]*\{loop\s+(\S+)\s+(\S+)\}[\n\r]*(.+?)[\n\r]*\{\/loop\}[\n\r\t]*/ies", "\$this->stripvtags('\n if(is_array(\\1)) { foreach(\\1 as \\2) { ?>','\n\\3\n } } ?>\n')", $template);
$template = preg_replace("/[\n\r\t]*\{loop\s+(\S+)\s+(\S+)\s+(\S+)\}[\n\r\t]*(.+?)[\n\r\t]*\{\/loop\}[\n\r\t]*/ies", "\$this->stripvtags('\n if(is_array(\\1)) { foreach(\\1 as \\2 => \\3) { ?>','\n\\4\n } } ?>\n')", $template);
$template = preg_replace("/[\n\r\t]*\{if\s+(.+?)\}[\n\r]*(.+?)[\n\r]*\{\/if\}[\n\r\t]*/ies", "\$this->stripvtags('\n if(\\1) { ?>','\n\\2\n } ?>\n')", $template);
}

$template = preg_replace("/\{$const_regexp\}/s", "=\\1?>", $template);
$template = preg_replace("/ \?\>[\n\r]*\ $hash=$this->file_hash($tp_path);
$head_hash=" ";
$foot_time=" ";
$this->file_write($this->cache_dir.$file.".tpl",$head_hash.$template.$foot_time);



}
}


/**
* 检查文件是否存在并且有读取权限
*
* @param unknown_type $path
*/

function file_test($path,$method){
if(!file_exists($path) || !fopen($path,$method)){
$this->error("模板文件不存在,或没有操作权限");
return false;
}
}

/**
* 读取文件内容
*
* @param unknown_type $path
* @return unknown
*/
function file_read($path,$length=0){
if(!$this->file_test($path,"r+")){
$fp=@fopen($path,"r+");
if($length==0){
$contents=@fread($fp,filesize($path));
}else{
$contents=@fread($fp,$length);
}
fclose($fp);
return $contents;
}
}


/**
* 写入文件内容
*
* @param unknown_type $path
* @param unknown_type $puts
*/
function file_write($path,$puts){

if(!$this->file_test($path,"w+")){
$fp=@fopen($path,"w+");
@fwrite($fp,$puts);
fclose($fp);
}

}


/**
* 计算文件的hash
*
* @param unknown_type $path
* @return unknown
*/
function file_hash($path){
return md5_file($path);
}


/**
* 对比模板文件与缓存文件的hash值
*
* @param unknown_type $file
* @return unknown
*/
function match_hash($file){
$read_hash=$this->file_read($this->cache_dir.$file.$this->cache_suffix,46);

$html_hash=$this->file_hash($this->tp_dir.$file.$this->tp_suffix);

if(preg_match("/".$html_hash."/i",$read_hash)){
return true;
}

}

function addquote($var) {
return str_replace("\\\"", "\"", preg_replace("/\[([a-zA-Z0-9_\-\.\x7f-\xff]+)\]/s", "['\\1']", $var));
}

function transamp($str) {
$str = str_replace('&', '&', $str);
$str = str_replace('&', '&', $str);
$str = str_replace('\"', '"', $str);
return $str;
}

function stripvtags($expr, $statement) {
$expr = str_replace("\\\"", "\"", preg_replace("/\/s", "\\1", $expr));
$statement = str_replace("\\\"", "\"", $statement);
return $expr.$statement;
}

}


$tp=new mmtp();
$tp->__setdir("./");
$tp->__setcdir("./cache/");
$tp->tp("index1");
$_GET[it]=sdhkadajksdhajdhkajsdhjkasdjkasdhasjdhkjsadhk;
$name=2;
$head="欢迎使用MoMo模板引擎";
include("./cache/index1.tpl");
?>

{$head}

{template index}
{if $name==1}
你好
{else}
谢谢
{/if}