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HomeBackend DevelopmentPHP TutorialTypecho中的皮肤函数functions.php

很抱歉,最近很忙,没有时间上来更新内容哈。
上篇文章《Typecho主题制作文件结构》介绍了制作Typecho主题所需要的模板文件,其中有一个特殊的文件,叫“皮肤函数”,文件名为functions.php,。本文将详细介绍此文件的作用。

文件在何时被加载

《Typecho中Widget_Archive解析》中有介绍,Typecho大部分请求的路由,都会转发到Widget_Archive中,在execute()函数中,即大概1357行处,有如下代码:

    /** 初始化皮肤函数 */    $functionsFile = $this->_themeDir . 'functions.php';    if (!$this->_invokeFromOutside && file_exists($functionsFile)) {        require_once $functionsFile;        if (function_exists('themeInit')) {            themeInit($this);        }    }

可见,在Widget_Archive加载目标模板文件前,会先加载模板目录下的functions.php文件,并尝试执行其中的themeInit函数,$this作为参数。

文件中可定义的特殊函数

上文提及了themeInit函数,会在所有模板文件被执行前执行,及可以认为是模板代码中第一个被执行的函数。类似的特殊函数还有:
* themeInit
* themeConfig
* themeConfigHandle
* themeFields
* threadedComments
* singlePing
* treeViewCategories

themeInit函数
themeInit函数会在所有模板文件前加载,一般用于配置Typecho行为,譬如修改默认pageSize为20等。

function themeInit($archive) {    if ($archive->is('index')) {        $archive->parameter->pageSize = 20; // 自定义条数    }}

其作用就是,主页中每页显示文章数由默认值改成20.

themeConfig函数
此函数用于生成模板在后台的配置选项。譬如如下函数,将生成如图的配置页面。

function themeConfig($form) {    $logoUrl = new Typecho_Widget_Helper_Form_Element_Text('logoUrl', NULL, NULL, _t('站点LOGO地址'), _t('在这里填入一个图片URL地址, 以在网站标题前加上一个LOGO'));    $form->addInput($logoUrl);    $sidebarBlock = new Typecho_Widget_Helper_Form_Element_Checkbox('sidebarBlock',     array('ShowRecentPosts' => _t('显示最新文章'),    'ShowRecentComments' => _t('显示最近回复'),    'ShowCategory' => _t('显示分类'),    'ShowArchive' => _t('显示归档'),    'ShowOther' => _t('显示其它杂项')),    array('ShowRecentPosts', 'ShowRecentComments', 'ShowCategory', 'ShowArchive', 'ShowOther'), _t('侧边栏显示'));    $form->addInput($sidebarBlock->multiMode());}

以上代码的效果:

themeConfigHandle函数
还没有搞明白怎么用,欢迎大侠补充哈

themeFields函数
作用类似themeConfig吧,这个也没有仔细研究过。

threadedComments函数
此函数用于配置评论输出。譬如:

function threadedComments($comments, $options) {    echo '自定义内容1';    $comments->content();    echo '自定义内容2';}

那么listComments(); ?>将输出:

<ol><li>自定义内容1 评论内容 自定义内容2</li><li>自定义内容1 评论内容 自定义内容2</li>...</ol>

singlePing函数
//这个也没有研究出是干什么的哈

treeViewCategories函数
此函数用于修改分类的输出样式。具体怎么使用,我研究下再补充上来哈。

文件还可以定义自定义函数

另外,由于functions.php在模板最前面加载,因此这里可以定义自己的函数,并在模板中使用。
举例,最常用的菜单高亮功能中,我们可以在functions.php中定义一个函数判断是否应该高亮当前菜单:

function active_current_menu($archive,$expected,$active_class='active'){    if($expected == 'index' && $archive.is('index')){        echo $active_class;    }else if($archive.is('archive') && $archive.getArchiveSlug() == $expected){        echo $active_class;    }else{        echo '';    }}

那么在模板文件中,可以这样使用:

<ul class='site-nav'>    <li class='<?php active_current_menu($this,'index','active') ?>'><a href="/index.php">首页</a></li>    <li class='<?php active_current_menu($this,'theme','active') ?>'><a href="/index.php/category/theme">模板</a></li>    <li class='<?php active_current_menu($this,'plugin','active') ?>'><a href="/index.php/category/plugin">插件</a></li>    ... ...</ul>

但要注意,functions.php是在Widget_Archive的execute函数中require进来的,因此functions.php中定义的函数都不能直接使用$this,即不能直接访问Widget_Archive内部变量。如果需要使用Widget_Archive的内容,可以通过函数参数的形式传进去,譬如上面的例子。

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