思路:
欲在速度和易用(主要指的是美工设计的方便性)之间取得一个平衡点.
于是采用了由html文件生成php文件的办法(编译?)
也想在分离显示逻辑和分离html代码之间平衡一下
例如一个论坛首页(index.php):
代码:
<?php
require('./template.php');
//由html生成的php文件的前缀,区别使用多种风格.
$tpl_prefix = 'default';
//模板文件名
$tpl_index = 'index';
$tpl = new Template($tpl_prefix);
$cats = array(
array('forum_id'=>'1','forum_cat_id'=>'0','forum_name'=>'PHP学习'),
array('forum_id'=>'2','forum_cat_id'=>'0','forum_name'=>'MYSQL学习')
);
$forums = array(
array('forum_id'=>'3','forum_cat_id'=>'1','forum_name'=>'PHP高级教程'),
array('forum_id'=>'4','forum_cat_id'=>'1','forum_name'=>'PHP初级教程'),
array('forum_id'=>'5','forum_cat_id'=>'2','forum_name'=>'MYSQL相关资料')
);
if ($cats)
{
if ($tpl->chk_cache($tpl_index))//检查判断是否需要重新生产PHP模板文件.
{
$tpl->load_tpl($tpl_index);//加载html模板文件.
//替换PHP语句
$tpl->assign_block("{block_cat}","<?foreach(\$cats as \$cat) {?>");
$tpl->assign_block("{/block_cat}","<?}?>");
$tpl->assign_block("{block_forum}","<?foreach(\$forums as \$forum) {
\nif(\$forum['forum_cat_id'] == \$cat['forum_id']) {?>");
$tpl->assign_block("{/block_forum}","<?}\n}?>");
//生产PHP模板文件.
$tpl->write_cache($tpl_index);
}
}
//包含PHP模板文件.
include($tpl->parse_tpl($tpl_index));
?>
对应的html模板文件(index.html):
代码:
{block_cat}
<table width="100%" border="0" cellspacing="1" cellpadding="1" bgcolor="#000000" align="center">
<tr align="{=TR_ALING}" bgcolor="#FFFFFF">
<td colspan="6"><span class="title"><b>{=$cat['forum_name']}</b></span></td>
</tr>
{block_forum}
<tr bgcolor="#FFFFFF">
<td valign="top">{=$forum['forum_name']}</td>
</tr>
{/block_forum}
</table>
<br>
{/block_cat}
经过处理,里面的{block_forum}{block_cat}标签被替换成PHP循环语句,用于显示数组种所有元素.
生成的PHP模板文件(default_index.php):
代码:
<?foreach($cats as $cat) {?>
<table width="100%" border="0" cellspacing="1" cellpadding="1" bgcolor="#000000" align="center">
<tr align="<?=TR_ALING?>" bgcolor="#FFFFFF">
<td colspan="6"><span class="title"><b><?=$cat['forum_name']?></b></span></td>
</tr>
<?foreach($forums as $forum) {
if($forum['forum_cat_id'] == $cat['forum_id']) {?>
<tr bgcolor="#FFFFFF">
<td valign="top"><?=$forum['forum_name']?></td>
</tr>
<?}
}?>
</table>
<br>
<?}?>
default_index.php被包含在index.php,这样就可以正常显示了.
这样,HTML模板文件可以用dw来进行修改美化,美工人员应该会方便一些.
template.php
代码:
<?php
/*********************************************************************************
* 模板类(Template)
* 最后修改时间:2004.4.07 本论坛使用
*
*
*
**********************************************************************************/
class Template {
//$this->$template,储存模板数据.
var $template = '';
//模板路径.
var $tpl_path = '';
//模板前缀(风格名称).
var $tpl_prefix = '';
//cache路径(编译后的路径).
var $cache_path = '';
//css文件路径.
var $css_path = '';
//header文件路径.
var $header_path = '';
//footer文件路径
var $footer_path = '';
/**
* 初始化模板路径.
*/
function Template($root = 'default')
{
//模板前缀(风格名称).
$this->tpl_prefix = $root;
//模板文件路径.
$this->tpl_path = './templates/' . $root . '/';
//生成的PHP文件存放路径.
$this->cache_path = './template_data/' .$this->tpl_prefix . '_';
return true;
}
/**
* chk_cache,检查"编译"后的模板是否需要更新,判断依据:最后修改时间,"编译"文件是否存在.
*/
function chk_cache($tpl_index)
{
$tpl_file = $this->tpl_path . $tpl_index . '.html';
$cache_file = $this->cache_path . $tpl_index . '.php';
//判断是否需要更新.
if(!file_exists($cache_file))
{
return true;
}
elseif(filemtime($tpl_file) > filemtime($cache_file))
{
return true;
}
}
/**
* 输出模板文件.
*/
function parse_tpl($tpl_index,$message='')
{
return $this->cache_path . $tpl_index . '.php';
}
/**
* 加载模板文件.
*/
function load_tpl($tpl_index)
{
$tpl_file = $this->tpl_path . $tpl_index . '.html';
$fp = fopen($tpl_file, 'r');
$this->template = fread($fp, filesize($tpl_file));
fclose($fp);
}
/**
* 替换变量,并且"编译"模板.
*/
function write_cache($tpl_index)
{
$cache_file = $this->cache_path . $tpl_index . '.php';
//变量显示.
$this->template = preg_replace("/(\{=)(.+?)(\})/is", "<?=\\2?>", $this->template);
//界面语言替换.
$this->template = preg_replace("/\{lang +(.+?)\}/ies", "\$lang['main']['\\1']", $this->template);
$fp = fopen($cache_file, 'w');
flock($fp, 3);
fwrite($fp, $this->template);
fclose($fp);
}
/**
* 替换block.
*/
function assign_block($search,$replace)
{
$this->template = str_replace($search,$replace,$this->template);
}
}
?>
