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HomeBackend DevelopmentPHP TutorialThinkPHP标签制作教程_PHP

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本文以实例讲解了ThinkPHP标签的制作方法,对于ThinkPHP的初学者或者开发人员都有一定的借鉴价值。

一般来说,ThinkPHP的默认标签解析器在Lib/Template/TagLib/TagLibCx.class(2.1版本位于ThinkPHP/Lib/Think/Template/TagLib/TagLibCx.class.php)中,里面定义了常用的如volist php 等常用ThinkPHP的标签

这里我们就在这个类中添加一个的标签解析。
 
一、标签格式:

<category parentid='0' ><{$cat.catname}></category>

二、标签作用:

循环输出父类id是parentid的栏目

三、操作步骤:

1.在tagLibCx.class 的私有属性中添加:

'category'=array('attr'=>'parentid',level=>3)

其中attr:标签的属性 level标签的嵌套层次
 
2.添加解析函数

标签的解析原理就是通过读取xml文件得到相应的信息,然后再拼凑成所需要的php源代码,最后通过echo 在页面上输出。

具体代码如下:

public function _category($attr,$content)
{
//把标签的所有属性解析到$tag数组里面
$tag = $this->parseXmlAttr($attr,'category');
//得到标签里面的属性
$parentid= $tag['parentid'];
//定义页面解析的变量
$result = !empty($tag['result'])&#63;$tag['result']:'cat'; //定义数据查询的结果存放变量
$key = !empty($tag['key'])&#63;$tag['key']:'i';
$mod = isset($tag['mod'])&#63;$tag['mod']:'2';
//拼凑数据库查询语句 这里直接用了CategoryModel封装好的函数
$sql = "D('Category')->";
$sql .= "getCategorys(".$parentid.')';
//拼凑输出字符
$parsestr = '<&#63;php $_result='.$sql.'; if ($_result): $'.$key.'=0;';
$parsestr .= 'foreach($_result as $key=>$'.$result.'):';
$parsestr .= '++$'.$key.';$mod = ($'.$key.' % '.$mod.' );&#63;>';
$parsestr .= $content;//解析在category标签中的内容
$parsestr .= '<&#63;php endforeach; endif;&#63;>';
return $parsestr;
}

CategoryModel中的getCategorys方法:

/*
* 根据parentid得到栏目信息
* $parentid 父id
* $withSelf 是否包含自己
*/
public function getCategorys($parentid,$withSelf=0)
{
$parentid=intval($parentid);
$categorys=$this->where(array('parentid'=>$parentid,'ismenu'=>1))->order('listorder ASC')->select();
//包含自己
if($withSelf)
{
$categorys2=$this->where(array('id'=>$parentid,'ismenu'=>1))->limit(1)->select();
$category=array_merge($categorys,$categorys2);
}
return $categorys;
}

3.页面上的引用:

<category parentid='0'>
<{$cat.catname}>
</category>

这样一个标签就做好了!!就可以甩掉那个volist在页面上动态输出我们想要的东西了!

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