php模板引擎的原理与简单实例

模板引擎其实就是将一个带有自定义标签的字符串，通过相应的规则解析，返回php可以解析的字符串，这其中正则的运用是必不可少的，所以要有一定的正则基础。
总体思想，引入按规则写好的模板，传递给标签解析类(_HtmlTag)进行解析，再把解析好的字符串传递给php进行解析渲染输出
首先定义了一个_HtmlTag类：

class _HtmlTag{
protected $taglist = "if|elseif|else|loop|for|while|=|:=|:e|:html|:";
protected $string;
protected $tpldir;
function __construct($dir, $tpl) {
$this->findReg = "/\\{[ ]*($this->findReg)(\\s*[\\{\\}]+\\s*)?\\}/i";
$this->tpldir = $dir;
$this->tpl =$tpl;
}
}

先解析下render方法
在render方法中对传入的字符串$s，进行相应的替换渲染，用到了extends方法，import方法，''开头的各种过滤方法，后面会一一进行详解.

function render($s) {
$s = str_replace(['<--{', '}-->'], ['{','}'], $s);
if (strpos($s, "{extends") !== false) {
$s = $this->_extends($s);
}
$s = preg_replace('/[\\n\\r]+/s', "\\n", $s);
$s = preg_replace('/\\r+/s', "", $s);
$s = preg_replace('/\\t+/s', "\\t", $s);

$this->string = str_replace(["\\{", "\\}"], ["\\HKH1", "\\HKH2"], $s);
preg_match_all("/\\{[ ]*(import)(\\s*[^\\{\\}]+\\s*)?\\}/i", $s, $d);
foreach($d[0] as $k => $v) {
call_user_func_array(array($this, "_import"), array($v, $d[1][$k], $d[2][$k]));
}
static $m = array("=" => "_defaultEcho", ":=" =>" _xssEcho", ":e" => "_htmlencodeEcho", ":" => "_echo", ":html" => "_htmldecodeEcho");
preg_match_all($this->findReg, $this->string, $d);
foreach ($d[0] as $k => $v) {
if (isset($m[$d[1][$k]])) {
$medth = $m[$d[1][$k]];
} else {
$medth = '_' . $d[1][$k];
}
call_user_func_array(array($this, $medth), array($v, $d[1][$k], $d[2][$k]));
}
}

_extends方法

使用 个方法是为了判断是否有继承相应的模板文件，在子文件中用{extends 模板名},一般只要填写文件名，如index,系统会自动去构造完整的文件路径，一般在上一级目录，这个在realTpl()方法时会有详解

function _extends($tpl) {
preg_match("/\\{\\s*extends\\s+([^\\{\\}]+?)\\s*\\}/i", $tpl, $d);
list($search, $arg) = $d;
if (stripos($arg, ".") !==0 ) {
$arg = '../' . $arg;
}
$file = $this->tpl->me->realTpl($arg . ".htm");
$basetpl = file_get_contents($file);
preg_match_all("/\\{block\\s+([^\\{\\}]+?)\\s*\\}(.+)\\{\\/block\\}/s", $tpl, $ds);
foreach($ds[1] as $n => $name) {
$basetpl = preg_replace("/\\{block\\s+name={$name}\\s*\\}/", $ds[2][$n], $basetpl);
}
$basetpl = preg_replace("/\\{block\\s+name=.+?\\}/", ' ', $basetpl);
return $basetpl;
}

_import 方法

_import 方法是用来对{import 文件名}标签进行解析，默认也是上层目录，会把该文件的内容解析到当前标签位置,同时支持使用：函数名|参数1, 参数2,...的方式进行字符串的回调.这中的display方法后面会有详解

function _import ($search, $tag, $arg) {
$arg = trim($arg);
if (stripos($arg, ".") !== 0) {
$arg = '../' . $arg;
}
$file = $this->tpl->me->realTpl($arg . ".htm");
if (file_exists($file)) {
$this->string = str_replace($search, file_get_contents($file), $this->string);
return;
} else {
if (stripos($file, "$") !== false) {
$this->string = str_replace($search, '<? include $this->tpl->display("' . $arg . '"); ?>', $this->string);
return;
}
if (stripos($arg, '|') !== false) {
list($func, $tmp) = explode("|", trim($arg));
$kw = explode(', ', $tmp);
} else {
$func = trim($arg);
$kw = array();
}
if (function_exists($func) {
$tpl_str = call_user_func_array($func, $kw);
$this->string = str_replace($search, $tpl_str, $this->string);
return;
} else {
$this->string = str_replace($search, $arg, $this->string);
return;
}
system_error($this->tpldir . trim($arg) . ".htm不存在");
}
}

现在来看一个标签函数_loop,将标签{loop $data $k $v}或{loop $data $v}替换，实现模板循环，其中的parseAttr方法接下来将详解

function _loop($search, $tag, $arg) {
list($attr, $arg) = $this->parseAttr($arg);
$d = preg_split("/\\s+/", trim($arg));
if (count($d) == 3) {
$data = $d[0];
$k = $d[1];
$v = $d[2];
$s = "<? \\n if(!empty($data)) {\\n \\t foreach(" . $data . " as {$k} => {$v}){";
} elseif (count($d) == 2) {
$data = $d[0];
$v = $d[1];
$s = "<? \\n if(!empty($data)){\\n \\t
foreach(". $datsa . " as {$v}) {";
}

if (isset($attr['counter'])) {
$s = "\\n \\t\\t<? if (!isset({$attr['counter']})) { {$attr['counter']} = 0;} ?> \\n \\t\\t" . $s . "\\n \\t\\t{$attr['counter']}++; \\n ?>;
} else {
$s .= "?>";
}
$this->string = str_replace($search, $s, $this->string);
$this->string = str_replace("{/loop}", "<? \\t}\\n}?>", $this->string);
}

parseAttr方法

该方法用来解析标签 的参数，返回的第一个参数是值形式字符串，第二个是键值数组，如{loop $data $k $v}返回$data $k $v 组成 的字符串和一个空数组，{if $k = $v}则返回空字符串和和数组[$k => $v];

function parseAttr($s) {
$reg = '/([a-zA-Z0-9_])+\\s*=\\s*([a-zA-Z0-9_\\$]+)/i';
$arg = preg_replace($reg, '', $s);
preg_match_all($reg, $s, $d);
$arr = array();
foreach($d[1] as $key => $value) {
$arr[trim($value)] = trim($d[2][$key]);
}
return array($arr, $arg);
}

_if 方法

将{if}{/if}标签解析成原生 的php，简单明了，不多解释

function _if ($search, $tag, $arg) {
$replace[0] = "<? if($arg){?>";
$replace[1] = "<? }?>";
$this->string = str_replace(array($search, "{/$tag}"), $replace, $this->string);
}

_else方法
将{else}解析成原生的php

function _else($search, $tag, $arg) {
$this->string = str_replace("{else}", "\\n" . '<? } else {?>', $this->string);
}

_elseif方法
将{elseif}解析成原生的php

function _elseif($search, $tag, $arg) {
$this->string = str_replace($search, "<? }elseif($arg){?>", $this->string);
}

　　

_for 方法

function _for($search, $tag, $arg) {
$s = trim(trim(preg_replace('/\\s+/', ' ; ', $arg)), ';');
$this->string = str_replace($search, "<? for($s){?>", $this->string);
$this->string = str_replace("{/for}", "<? \\t\\n}?>", $this->string);
}

　　

_while方法

function _while($search, $tag, $arg) {
$this->string = str_replace($search , "<? while($aeg){ ?>", $this->string);
$this->string = str_replace("{/while}", "<? \\t\\n} ?>", $this->string);
}

　　

_end方法
通过这个方法对其$this->string进行修改可以对变量进行如下标签定义：
{$val}{$arr[$key]}{$arr['key']}{:val()}{$arr.key}{$arr.$key}

function _end() {
//{$val}标签解析
$this->string = preg_replace('/\\{(\\$\\w+.*)\\}/is', "<?=\\\\1;?>", $this->string);
//{:$val()}标签解析
$this->string = preg_replace('/\\{\\:\\s*(\\$?\\w+.*?)\\}/is', "<? =\\\\1;?>", $this->string);
//将$val[arg]解析成$val['arg']
$this->string = preg_replace('/\\$([_a-z]+\\w*)\\[([_a-z]+\\w*)\\]/is', "$\\\\1['\\\\2']", $this->string);
//支持点号访问数组。如array['key']可以用array.key访问
$this->string = preg_replace('/\\$([_a-z]+\\w*)\\.(\\$[_a-z]+\\w*)/is', "$\\\\1[\\\\2]", $this->string);
$this->string = preg_replace('/\\$([_a-z]+\\w*)\\.([_a-z]+\\w*)/is', "$\\\\1['\\\\2']", $this->string);
$this->string = preg_replace(array("/<\?/", "/<?\php\s*=/"), array("<?php ", "<?php echo "), $this->string);
}

　　

_result方法,做最后处理，返回字符串，_end方法在上面已经解释过了

function result() {
$this->_end();
$this->_baseParse($this->stirng);
return str_replace(array("\\HKH1", "\\HKH2"), array("\\{", "\\}"), $this->string);
}

　　

下面再来介绍一下几个过滤的方法

_htmlencodeEcho方法

可以用此种形式对变量进行htmlspecialchars式的过滤spspecialchars函数后面会有介绍{:e $val}

function _htmlencodeEcho($search, $tag, $arg) {
if (stripos($arg, '$')) {
$this->string = str_replace($search, "<? echo sphtmlspecialchars(!empty($arg)?$arg:''))?>", $this->string);
} else {
$this->string = str_replace($search, "<? echo sphtmlspecialchars($arg)?>", $this->string);
}
}

　　

_htmldecodeEcho方法

_htmldecodeEcho($search, $tag, $arg) {
if (stripos($arg, '$')) {
$this->string = str_replace($search, "<? echo htmlspecialchars_decode(!empty($arg)?$arg:'')?>", $this->string);
} else {
$this->string = str_replace($search, "<? echo htmlspecialchars_decode($arg)?>", $this->string);
}
}

　　

_defaultEcho方法

function _defaultEcho($search, $tag, $arg) {
if (stripos($arg, ',') == false) {
$arg . = ", ' ' ";
list($v, $default) = explode(",", $arg);
$this->string = str_replace($search, "<? echo empty($v)?$default:$v; ?>", $this->string);
}
}

　　

_xssEcho方法

_xssEcho($search, $tag, $arg) {
$this->string = str_replace($search, "<? echo xssRemove($arg); ?>", $this->string);
}

　　

_echo方法

function _echo($search, $tag, $arg){
$this->string = str_replace($search, "<? echo $arg;?>", $this->string);
}

　　

_baseParse方法，这个对css和js的引入进行处理

function _baseParse($s) {
if (strpos($s, "{loadCss") !== false) {
$s = $this->_loadCss($s);
}
if (strpos($s, "{loadJs") !== false) {
$s = $this->_loadJs($s);
}
return $s;
}

　　

_loadJs方法

function _loadJs($tpl) {
preg_match_all('/\{loadJs\s+([^\{\}]+?)\s*\}/i', $tpl, $match);
include "jsmin.php";
foreach($match[1] as $k => $js) {
$jsstr = "";
$cdn = "";
$if (stripos($js, ',') !== false) {
$filename = "";
$md5 = "";
$js_content = "";
foreach(explode(',', $js) as $j) {
$filename .= basename($j, '.js') . ',';
$md5 .= self::fileMd5($j);
if (stripos($j, '.min.') == false) {
$js_content .= JSMin::minify(file_get_contents(WEB_ROOT . $j));
} else {
$js_content .= file_get_contents(WEB_ROOT . $j);
}
$js_content .= ';'
}
$md5 = md5($md5);
$filename = dirname($j) . '/' .trim($filename, ',') . '.js';
self::parseJs($js_content, $filename);
$jsstr = "<script src=\"{$cdn}{$filename}?v={$md5}\"></script>";
} else {
$md5 = self::fileMd5($js);
if (stripos($js, ".min.") === false) {
$js = self::pareJs(JSMin::minify(file_get_contents(WEB_ROOT . $js)), dirname($js). '/' .basename($js, '.js') . '.min.js');
}
$jsstr = "<script src=\"{$cdn}{$js}?v={$mdt}\"></script>";
}
$tpl = str_replace($match[0][$k], $jsstr, $tpl);
}
return $tpl;
}

　　

_loadCss方法

function _loadCss($tpl) {
preg_match_all('/\{loadCss\s+([^\{\}]+)\s*\}/i' , $tpl , $match);
$cdn = "";
foreach($match[1] as $k => $css) {
$cssstr = "";
if (stripos($css, ',') !== false) {
$filename = "";
$md5 = "";
$css_content = "";
foreach($explode(',', $css) as $css) {
$filename .= basename($css, '.css') . ',';
$md5 = self::fileMd5($css);
$css_content .= file_get_contents(WEB_ROOT .$css);
}
$md5 = md5($md5);
$filename = dirname($css) . '/' .trim($filename, ',') . '.css';
self::parseCss($css_content, $filename);
$cssstr = "<link rel=\"stylesheet\" href=\"{$cdn}{$filename}?v={md5}\">";
} else {
$md5 = self::fileMd5($css);
if (stripos($css, ".min.") == false) {
$css = self::parseCss(file_get_contents(WEB_ROOT . $css), dirname($css) . '/' .basename($css, '.css') . '.min.css');
}
$cssstr .= "<link rel=\"stylesheet\" href=\"{$cdn}{$css}?v={$md5}\">";
}
$tpl = str_replace($match[0][$k], $cssstr, $tpl);
}
return $tpl;
}

　　

上面两个函数都用到了各自的parseCss,和parseJs,让我们来看下

static function parseCss($css_content, $filename) {
$css_content = preg_replace("/[\r\n\t]/", '', $css_content);
$css_content = preg_replace("/ +/", ' ', $css_content);
sp_file_pu_contents(WEB_ROOT . $filename, $css_content);
return $filename;
}
static function parseJs($js, $filename) {
sp_file_put_content(WEB_ROOT . $filename, $js);
return $filename;
}

　　

上面的_html类和他的方法对传入的字符串进行了标签到原生 Php的替换，可以传入相应的模板，也可以在其中自定义自己的过滤方法。

下面我们再来看一个template类：

定义这个类来对模板进行管理，这里会用到上面的_html类，基本定义如下，接下来会介绍其中的一些方法

class template {
private $tpl_cache_dir;
public $ext = ".htm";
public $default_tpl_dir = false;
public $me;

function _construct($tpl_cache_dir, $me) {
$this->sets($tpl_cache_dir);
$this->me = $me;
}
function sets($tpl_cache_dir) {
$this->tpl_cache_dir = $tpl_cache_dir;
if (SP_DEBUG == 1) {
spmkdir($this->tpl_cache_dir);
}
}
function default_template($dir) {
$this->default_tpl_dir = $dir;
}
}

　　

getString方法

在之前 开启ob_start(),然后获取这之间的ob数据，试用于框架中

function getString() {
$s = ob_get_contents();
ob_clean();
return $s;
}

　　

display方法

function display($tpl, $return = 0, $script = SCRIPT) {
$tpl .= $this->ext;
$tpl_name = $this->tpl_cache_dir . $script . '_' . str_replace(['/', '\\\\'], '_', $tpl);
if (SP_DEBUG){
if (SP_DEBUG == 1 || (SP_DEBUG == 2 && !file_exists($tpl_name))) {
$this->compiles($tpl_name, $tpl);
}
}
return $tpl_name;
}

　　

compiles方法, 在这里使用了sp_file_put_contentsb函数会在后面介绍

function compiles($cache_name, $tpl) {
if (!file_exists($tpl)) {
if (file_exists($this->default_tpl_dir . $tpl)) {
$html = file_get_contents($this->default_tpl_dir . $tpl);
} else {
spmkdir(dirname($tpl), '777');
file_get_contents($tpl, 这个是自动生成模板');
}
} else {
$html = file_get_contents($tpl);
}
$tag = new _HtmlTag(realpath(dirname($tpl) . '/../'), $this);
$tag->render($html);
$html = preg_replace_callback('//s', array(&$this, "make_magic_func"), $tag->result());
$html = preg_replace('/[\\n\\r]{1,}/s', "\\n", $html);
@unlink($cache_name);
sp_file_put_contents($cache_name, $thml);
}

　　

make_magic_func方法

function make_magic_func($d) {
preg_match_all('/(\\w+)=\\s*(\\'|\\")([^\\'"]+)?\\2/m', $d[2], $dd);
$aa = array();
foreach($dd[1] as $i => $k) {
$vs = preg_replace('/([^\\-]*[<>]{1,1})\\s*(\\S+)?\\s*/', '\\1\\'\\2\\' ', $dd[3][$i]);
$vs = preg_replace('/=\\s*(\\S+)?\\s*/', '=\\'\\1\\'', $dd[3][$i]);
if (stripos($d[3][$i], '$') !== false) {
$vs = preg_replace('/\\$([^\\']+)\\s*/', '{$\\1}', $vs);
}
}
}

注意

两个类的相应方法都 定义好了，这其中用到的函数sp_file_pu_contents($file, $data)

function sp_file_put_contents($file, $data) {
$dir = dirname($file);
if (is_writeable($dir)) {
return file_put_contents($file, $data);
} else {
throw new writeFail(sprintf("写入文件%s,失败，目录不可写", $file), 503);
}
}

js压缩类: jsmin.class.php
链接：http://pan.baidu.com/s/1kUBx0X5 密码：y5jb
将这两个 类定义在一个文件中，使用进进行相应的配置

define("WEB_ROOT", dirname(__FILE__) . '/');

　　　使用

文件准备

base.htm,main.htm,test.js,test1.js,test.css,test1.css,indx.php,im.htm

main.htm:

{import ./im}
{block name=head}
{block name=body}
{block name=foot}

base.htm

{extends ./main}
{block head}
{loadCss test.css,test1.css}
{loop $data $k $v}
<p>
我是头部
</p>
{/loop}
{if $bb == 'aa'}
<p>
我是if 测试
</p>
{elseif $bb = 'bb'}
<p>
我是elesif测试
</p>
{else}
<p>
我是eles测试
</p>
{/if}
{for $i=0 $i<10 $i++}
<p>
我是for循环
</p>
{/for}
{while $con >5}
<? $con--;?>
<p>
我是while循环
</p>
{/while}
{/block}
{block foot}
<p>
我是尾部
</p>
{loadJs test1.js,test.js}
{/block}

im.htm

我是import进来的

index.php

<?php
define('WEB_ROOT',dirname(__FILE__) . '/');
function sp_file_put_contents($file, $data) {
$dir = dirname($file);
if (is_writeable($dir)) {
return file_put_contents($file, $data);
} else {
throw new writeFail(sprintf("写入文件%s,失败，目录不可写", $file), 503);
}
}
class _HtmlTag{
protected $taglist = "if|elseif|else|loop|for|while|=|:=|:e|:html|:";
protected $string;
protected $tpldir;
public $findReg;
function __construct($dir, $tpl) {
$this->findReg = "/\{[ ]*($this->taglist)(\s*[^\{\}]+\s*)?\}/i";
$this->tpldir = $dir;
$this->tpl =$tpl;
}
function render($s) {
$s = str_replace(['<--{', '}-->'], ['{','}'], $s);
if (strpos($s, "{extends") !== false) {
$s = $this->_extends($s);
}
$s = preg_replace('/[\n\r]+/s', "\n", $s);
$s = preg_replace('/\r+/s', "", $s);
$s = preg_replace('/\t+/s', "\t", $s);
$this->string = str_replace(["\{", "\}"], ["\HKH1", "\HKH2"], $s);
preg_match_all("/\{[ ]*(import)(\s*[^\{\}]+\s*)?\}/i", $s, $d);
foreach($d[0] as $k => $v) {
call_user_func_array(array($this, "_import"), array($v, $d[1][$k], $d[2][$k]));
}
static $m = array("=" => "_defaultEcho", ":=" =>" _xssEcho", ":e" => "_htmlencodeEcho", ":" => "_echo", ":html" => "_htmldecodeEcho");
preg_match_all($this->findReg, $this->string, $d);
foreach ($d[0] as $k => $v) {
if (isset($m[$d[1][$k]])) {
$medth = $m[$d[1][$k]];
} else {
$medth = '_' . $d[1][$k];
}
call_user_func_array(array($this, $medth), array($v, $d[1][$k], $d[2][$k]));
}
}
function _extends($tpl) {
preg_match("/\{\s*extends\s+([^\{\}]+?)\s*\}/i", $tpl, $d);
list($search, $arg) = $d;
if (stripos($arg, ".") !==0 ) {
$arg = '../' . $arg;
}
//$file = $this->tpl->me->realTpl($arg . ".htm");
$file = $arg . ".htm";
$basetpl = file_get_contents($file);
preg_match_all("/\{block\s+([^\{\}]+?)\s*\}(.+?)\{\/block\}/s", $tpl, $ds);
foreach($ds[1] as $n => $name) {
$basetpl = preg_replace("/\{block\s+name={$name}\s*\}/", $ds[2][$n], $basetpl);
}
$basetpl = preg_replace("/\{block\s+name=.+?\}/", ' ', $basetpl);

return $basetpl;
}
function _import ($search, $tag, $arg) {

$arg = trim($arg);
if (stripos($arg, ".") !== 0) {
$arg = '../' . $arg;
}
//$file = $this->tpl->me->realTpl($arg . ".htm");
$file = $arg . ".htm";
if (file_exists($file)) {
$this->string = str_replace($search, file_get_contents($file), $this->string);
return;
} else {
if (stripos($file, "$") !== false) {
$this->string = str_replace($search, '<? include $this->tpl->display("' . $arg . '"); ?>', $this->string);
return;
}
if (stripos($arg, '|') !== false) {
list($func, $tmp) = explode("|", trim($arg));
$kw = explode(', ', $tmp);
} else {
$func = trim($arg);
$kw = array();
}
if (function_exists($func)) {
$tpl_str = call_user_func_array($func, $kw);
$this->string = str_replace($search, $tpl_str, $this->string);
return;
} else {
$this->string = str_replace($search, $arg, $this->string);
return;
}
system_error($this->tpldir . trim($arg) . ".htm不存在");
}
}

function mytest(){
return $this->string;
}

function _baseParse($s) {
if (strpos($s, "{loadCss") !== false) {
$s = $this->_loadCss($s);
}
if (strpos($s, "{loadJs") !== false) {
$s = $this->_loadJs($s);
}
return $s;
}
function fileMd5($f) {
if (stripos($f, "http://") !== false) {
return md5($f);
}
return md5_file(WEB_ROOT . $f);
}

function _loadCss($tpl) {
preg_match_all('/\{loadCss\s+([^\{\}]+)\s*\}/i' , $tpl , $match);
$cdn = "";
foreach($match[1] as $k => $css) {
$cssstr = "";
if (stripos($css, ',') !== false) {
$filename = "";
$md5 = "";
$css_content = "";
foreach(explode(',', $css) as $css) {
$filename .= basename($css, '.css') . ',';
$md5 = self::fileMd5($css);
$css_content .= file_get_contents(WEB_ROOT .$css);
}
$md5 = md5($md5);
$filename = dirname($css) . '/' . trim($filename, ',') . '.css';
self::parseCss($css_content, $filename);
$cssstr = "<link rel=\"stylesheet\" href=\"{$cdn}{$filename}?v={$md5}\">";
} else {
$md5 = self::fileMd5($css);
if (stripos($css, ".min.") == false) {
$css = self::parseCss(file_get_contents(WEB_ROOT . $css), dirname($css) . '/' .basename($css, '.css') . '.min.css');
}
$cssstr .= "<link rel=\"stylesheet\" href=\"{$cdn}{$css}?v={$md5}\">";
}
$tpl = str_replace($match[0][$k], $cssstr, $tpl);
}
return $tpl;
}

function _loadJs($tpl) {

preg_match_all('/\{loadJs\s+([^\{\}]+?)\s*\}/i', $tpl, $match);
//var_dump($match);die;
include "jsmin.class.php";
foreach($match[1] as $k => $js) {
$jsstr = "";
$cdn = "";
if (stripos($js, ',') !== false) {
$filename = "";
$md5 = "";
$js_content = "";
foreach(explode(',', $js) as $j) {
$filename .= basename($j, '.js') . ',';
$md5 .= self::fileMd5($j);
if (stripos($j, '.min.') === false) {
$js_content .= JSMin::minify(file_get_contents(WEB_ROOT . $j));
} else {
$js_content .= file_get_contents(WEB_ROOT . $j);
}
$js_content .= ';';
}
$md5 = md5($md5);

$filename = dirname($js) . '/' .trim($filename, ',') . '.js';
self::parseJs($js_content, $filename);
$jsstr = "<script src=\"{$cdn}{$filename}?v={$md5}\"></script>";
} else {
$md5 = self::fileMd5($js);
if (stripos($js, ".min.") === false) {
$js = self::pareJs(JSMin::minify(file_get_contents(WEB_ROOT . $js)), dirname($js). '/' .basename($js, '.js') . '.min.js');
}
$jsstr = "<script src=\"{$cdn}{$js}?v={$mdt}\"></script>";
}
$tpl = str_replace($match[0][$k], $jsstr, $tpl);
}
return $tpl;
}

static function parseCss($css_content, $filenme) {

$css_content = preg_replace("/[\r\n\t]/", '', $css_content);
$css_content = preg_replace("/ +/", ' ', $css_content);
// echo WEB_ROOT . $filenme;

sp_file_put_contents(WEB_ROOT . $filenme, $css_content);

return $filenme;
}

static function parseJs($js, $filenme) {

sp_file_put_contents(WEB_ROOT . $filenme, $js);

return $filenme;

}

function _loop($search, $tag, $arg) {
list($attr, $arg) = $this->parseAttr($arg);
$d = preg_split("/\s+/", trim($arg));
if (count($d) == 3) {
$data = $d[0];
$k = $d[1];
$v = $d[2];
$s = "<? \n if(!empty($data)) {\n \t foreach(" . $data . " as {$k} => {$v}){";
} elseif (count($d) == 2) {
$data = $d[0];
$v = $d[1];
$s = "<? \n if(!empty($data)){\n \t foreach(". $datsa . " as {$v}) {";
}

if (isset($attr['counter'])) {
$s = "\n\t\t <? if (!isset({$attr['counter']})) { {$attr['counter']} = 0;} ?> \n \t\t" . $s . "\n \t\t{$attr['counter']}++; \n ?>";
} else {
$s .= "?>";
}
$this->string = str_replace($search, $s, $this->string);
$this->string = str_replace("{/loop}", "<? \t}\n}?>", $this->string);
}
function parseAttr($s) {
$reg = '/([a-zA-Z0-9_])+\s*=\s*([a-zA-Z0-9_\$]+)/i';
$arg = preg_replace($reg, '', $s);
preg_match_all($reg, $s, $d);
$arr = array();
foreach($d[1] as $key => $value) {
$arr[trim($value)] = trim($d[2][$key]);
}
return array($arr, $arg);
}
function _if ($search, $tag, $arg) {
$replace[0] = "<? if($arg){?>";
$replace[1] = "<? }?>";
$this->string = str_replace(array($search, "{/$tag}"), $replace, $this->string);
}
function _else($search, $tag, $arg) {
$this->string = str_replace("{else}", "\n" . '<? } else {?>', $this->string);
}
function _elseif($search, $tag, $arg) {
$this->string = str_replace($search, "<? }elseif($arg){?>", $this->string);
}
function _for($search, $tag, $arg) {
$s = trim(trim(preg_replace('/\s+/', ' ; ', $arg)), ';');
$this->string = str_replace($search, "<? for($s){?>", $this->string);
$this->string = str_replace("{/for}", "<? \t\n}?>", $this->string);
}
function _while($search, $tag, $arg) {
$this->string = str_replace($search , "<? while($arg){ ?>", $this->string);
$this->string = str_replace("{/while}", "<? \t\n} ?>", $this->string);
}
function _end() {
//{$val}标签解析
$this->string = preg_replace('/\\{(\\$\\w+.*)\\}/is', "<?=\\\\1;?>", $this->string);
//{:$val()}标签解析
$this->string = preg_replace('/\\{\\:\\s*(\\$?\\w+.*?)\\}/is', "<? =\\\\1;?>", $this->string);
//将$val[arg]解析成$val['arg']
$this->string = preg_replace('/\\$([_a-z]+\\w*)\\[([_a-z]+\\w*)\\]/is', "$\\\\1['\\\\2']", $this->string);
//支持点号访问数组。如array['key']可以用array.key访问
$this->string = preg_replace('/\\$([_a-z]+\\w*)\\.(\\$[_a-z]+\\w*)/is', "$\\\\1[\\\\2]", $this->string);
$this->string = preg_replace('/\\$([_a-z]+\\w*)\\.([_a-z]+\\w*)/is', "$\\\\1['\\\\2']", $this->string);
$this->sring = preg_replace(array("/<\?/", "/<\?php\s*=/"), array("<?php ", "<?php echo "), $this->string);
}
function result() {
$this->_end();
$this->string = $this->_baseParse($this->string);
return str_replace(array("\\HKH1", "\\HKH2"), array("\\{", "\\}"), $this->string);
}
}
$data = ['aa','bb','cc'];
$bb = 'aa';
$con = 11;
$tag = new _HtmlTag('./index', '');
$str = file_get_contents('base.htm');
$tag->render($str);
$html = $tag->result();
var_dump($html);
echo '</br>----------------------------</br>';
sp_file_put_contents("./index.html", $html);
include "index.html";

运行index.php查看结果

总结

我们来总结一下这个类的使用过程，先实例话template类，调用template::display()方法，其中会调用template::compiles()方法，这个方法会实例化_HhtmlTag类，调用_HtmlTag::render方法，在这个方法里，对传入的带字符串进行一个结构的完整化，包括调用_HtmlTag::_extends,_HtmlTag::_import，_HtmlTag::_loop,_HtmlTag::_if,_HtmlTag::elseif,_HtmlTag::else,_HtmlTag::_for,_HtmlTag::while接着调用_HtmlTag::result方法，里面调用_HtmlTag::_end方法对变量进行php原生化和_HtmlTag::_baseParse()引入css和js，最后返回解析好的完整模板字符串。