概述
wp_title 是一个 WordPress 过滤器，用于修改页面标题文本，影响 HTML
标签的内容。它接受三个参数：标题字符串、分隔符和分隔符位置，开发者可以通过 add_filter 注册自定义函数来调整标题输出。</p><h2>关键要点</h2><ul><li>wp_title 过滤器用于过滤页面标题，作用于 wp_title() 函数生成的 HTML <title> 标签，而非文章、页面或分类标题本身。</li><li>过滤器参数包括 $title（标题字符串）、$sep（分隔符）和 $seplocation（分隔符位置，可选 'left' 或 'right'）。</li><li>注册过滤器时需使用 add_filter('wp_title', 'filter_function_name', 10, 3)，其中 filter_function_name 必须是唯一的函数名，且函数必须返回处理后的标题字符串。</li><li>wp_title 在历史上曾被标记为弃用，但后来已恢复使用；建议开发者关注相关替代过滤器如 pre_get_document_title、document_title_separator 和 document_title_parts。</li></ul><h2>代码示例</h2><pre class="hljs language-php"><code class="hljs language-php">add_filter( <span class="hljs-string">'wp_title'</span>, <span class="hljs-string">'filter_function_name'</span>, <span class="hljs-number">10</span>, <span class="hljs-number">3</span> );
<span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">filter_function_name</span><span class="hljs-params">( $title, $sep, $seplocation )</span> </span>{
<span class="hljs-comment">// 自定义标题处理逻辑</span>
<span class="hljs-keyword">return</span> $title;
}</code></pre><h2>注意事项</h2><ul><li>过滤器函数必须返回标题字符串，否则可能导致标题空白或引发其他插件错误。</li><li>函数名 filter_function_name 不能与已声明的其他函数名冲突，需确保唯一性。</li><li>虽然 wp_title 当前可用，但建议开发者了解并考虑使用 WordPress 4.4 引入的文档标题相关过滤器以保持代码前瞻性。</li></ul> </div>
</section>
<hr class="doc-separator">
<section class="original-content">
<div class="original-header">
<span class="original-icon">📄</span>
<span class="original-label">原文内容</span>
</div>
<div class="original-body">
<section class="wp-block-wporg-code-reference-summary">
<p>Filters the text of the page title.</p>
</section>
<section class="wp-block-wporg-code-reference-parameters">
<h2 id="parameters" class="is-toc-heading wp-block-heading has-heading-5-font-size"><a href="#parameters">Parameters</a></h2>
<dl>
<dt><code class="hljs language-php">$title</code><span class="type"><span class="string">string</span></span></dt>
<dd>
<div class="desc"><span class="description">Page title.</span></div>
</dd>
<dt><code class="hljs language-php">$sep</code><span class="type"><span class="string">string</span></span></dt>
<dd>
<div class="desc"><span class="description">Title separator.</span></div>
</dd>
<dt><code class="hljs language-php">$seplocation</code><span class="type"><span class="string">string</span></span></dt>
<dd>
<div class="desc"><span class="description">Location of the separator (either <code class="hljs language-javascript"><span class="hljs-string">'left'</span></code> or <code class="hljs language-javascript"><span class="hljs-string">'right'</span></code>).</span></div>
</dd>
</dl>
</section>
<section class="wporg-has-embedded-code wp-block-wporg-code-reference-explanation">
<h2 id="more-information" class="is-toc-heading wp-block-heading has-heading-5-font-size"><a href="#more-information">More Information</a></h2>
<p class="wp-block-paragraph">The <code class="hljs language-">wp_title</code> filter is used to filter the title of the page (called with <code class="hljs language-xml"><span class="hljs-tag"><<span class="hljs-name">a</span> <span class="hljs-attr">title</span>=<span class="hljs-string">"Function Reference/wp title"</span> <span class="hljs-attr">href</span>=<span class="hljs-string">"https://developer.wordpress.org/reference/functions/wp_title/"</span>></span>wp_title()<span class="hljs-tag"></<span class="hljs-name">a</span>></span></code>). This filters the text appearing in the HTML <title> tag (sometimes called the “title tag” or “meta title”), not the post, page, or category title.</p>
<p class="wp-block-paragraph">A plugin (or theme) can register as a content filter with the code:</p>
<pre class="wp-block-code hljs language-javascript"><code class="wp-block-code hljs language-javascript">add_filter( <span class="hljs-string">'wp_title'</span>, <span class="hljs-string">'filter_function_name'</span>, <span class="hljs-number">10</span>, <span class="hljs-number">3</span> );</code></pre>
<p class="wp-block-paragraph">Where ‘filter_function_name’ is the function WordPress should call when the content is being retrieved. Note that the filter function <b>must</b> return the content after it is finished processing, or the title will be blank and other plugins also filtering the content may generate errors.</p>
<p class="wp-block-paragraph"><b>filter_function_name</b> should be unique function name. It cannot match any other function name already declared.</p>
</section>
<section class="wp-block-wporg-code-reference-source">
<h2 id="source" class="is-toc-heading wp-block-heading has-heading-5-font-size"><a href="#source">Source</a></h2>
<pre class="wp-block-code hljs language-php"><code class="wp-block-code hljs language-php">$title = apply_filters( <span class="hljs-string">'wp_title'</span>, $title, $sep, $seplocation );
</code></pre>
<p class="wporg-dot-link-list"><a href="https://developer.wordpress.org/reference/files/wp-includes/general-template.php/">View all references</a> <a href="https://core.trac.wordpress.org/browser/tags/6.9.4/src/wp-includes/general-template.php#L1464">View on Trac</a> <a href="https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/general-template.php#L1464-L1464">View on GitHub</a></p>
</section>
<section class="wp-block-wporg-code-reference-related" data-nosnippet="true">
<h2 id="related" class="is-toc-heading wp-block-heading has-heading-5-font-size"><a href="#related">Related</a></h2>
<section style="margin-top:var(--wp--preset--spacing--20)" class="wp-block-wporg-code-table" id="used-by">
<figure class="wp-block-table ">
<table>
<thead>
<tr>
<th scope="col">Used by</th>
<th scope="col">Description</th>
</tr>
</thead>
<tbody>
<tr class="">
<td><a href="https://developer.wordpress.org/reference/functions/wp_title/">wp_title()</a><code class="hljs language-">wp-includes/general-template.php</code></td>
<td>
<p>Displays or retrieves page title for all areas of blog.</p>
</td>
</tr>
</tbody>
</table>
</figure>
</section>
</section>
<section class="wp-block-wporg-code-reference-changelog">
<h2 id="changelog" class="is-toc-heading wp-block-heading has-heading-5-font-size"><a href="#changelog">Changelog</a></h2>
<section style="margin-top:var(--wp--preset--spacing--20)" class="wp-block-wporg-code-table">
<figure class="wp-block-table ">
<table>
<thead>
<tr>
<th scope="col">Version</th>
<th scope="col">Description</th>
</tr>
</thead>
<tbody>
<tr class="">
<td><a href="https://developer.wordpress.org/reference/since/2.0.0/">2.0.0</a></td>
<td>Introduced.</td>
</tr>
</tbody>
</table>
</figure>
</section>
</section>
<section class="wp-block-wporg-code-reference-comments" data-nosnippet="true">
<h2 id="user-contributed-notes" class="is-toc-heading wp-block-heading"><a href="#user-contributed-notes">User Contributed Notes</a></h2>
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<li id="comment-1076" data-comment-id="1076" class="comment byuser comment-author-andrewklimek even thread-even depth-1">
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<p> <a href="#comment-content-1076" class="screen-reader-text">Skip to note 5 content</a></p>
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<a href="https://profiles.wordpress.org/andrewklimek/" rel="external nofollow" class="url">Andrew Klimek</a> </span><br />
<a class="comment-date" href="https://developer.wordpress.org/reference/hooks/wp_title/#comment-1076"><br />
<time datetime="2016-02-10T17:38:28+00:00"><br />
10 years ago </time><br />
</a></p></div>
<div class="user-note-voting" data-nonce="86d20d14ff" data-can-vote="false"><a class="user-note-voting-up" title="You must log in to vote on the helpfulness of this note" data-id="1076" data-vote="up" href="https://login.wordpress.org?redirect_to=https%3A%2F%2Fdeveloper.wordpress.org%2Freference%2Fhooks%2Fwp_title%2F%23comment-1076"><span class="screen-reader-text">You must log in to vote on the helpfulness of this note</span></a><span class="user-note-voting-count " title="68% like this"><span class="screen-reader-text">Vote results for this note: </span>7</span><a class="user-note-voting-down" title="You must log in to vote on the helpfulness of this note" data-id="1076" data-vote="down" href="https://login.wordpress.org?redirect_to=https%3A%2F%2Fdeveloper.wordpress.org%2Freference%2Fhooks%2Fwp_title%2F%23comment-1076"><span class="screen-reader-text">You must log in to vote on the helpfulness of this note</span></a></div>
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<p>wp_title is being deprecated, see <a href="https://make.wordpress.org/core/2015/10/20/document-title-in-4-4/" rel="nofollow ugc">https://make.wordpress.org/core/2015/10/20/document-title-in-4-4/</a></p>
<p>Please use:</p>
<p> <a href="https://developer.wordpress.org/reference/hooks/pre_get_document_title/"><code class="hljs language-">pre_get_document_title</code></a> – short-circuits <code class="hljs language-">wp_get_document_title()</code> if it returns anything other than an empty value.<br />
<a href="https://developer.wordpress.org/reference/hooks/document_title_separator/"><code class="hljs language-">document_title_separator</code></a> – filters the separator between title parts.<br />
<a href="https://developer.wordpress.org/reference/hooks/document_title_parts/"><code class="hljs language-">document_title_parts</code></a> – filters the parts that make up the document title, passed in an associative array.</p>
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<a href="https://profiles.wordpress.org/acuvic/" rel="external nofollow" class="url">acuvic</a> </span><br />
<a class="comment-date" href="https://developer.wordpress.org/reference/hooks/wp_title/#comment-2382"><br />
<time datetime="2017-09-26T19:24:51+00:00"><br />
9 years ago </time><br />
</a></p></div>
<div class="user-note-voting" data-nonce="37c6c7f66c" data-can-vote="false"><a class="user-note-voting-up" title="You must log in to vote on the helpfulness of this note" data-id="2382" data-vote="up" href="https://login.wordpress.org?redirect_to=https%3A%2F%2Fdeveloper.wordpress.org%2Freference%2Fhooks%2Fwp_title%2F%23comment-2382"><span class="screen-reader-text">You must log in to vote on the helpfulness of this note</span></a><span class="user-note-voting-count " title="100% like this"><span class="screen-reader-text">Vote results for this note: </span>6</span><a class="user-note-voting-down" title="You must log in to vote on the helpfulness of this note" data-id="2382" data-vote="down" href="https://login.wordpress.org?redirect_to=https%3A%2F%2Fdeveloper.wordpress.org%2Freference%2Fhooks%2Fwp_title%2F%23comment-2382"><span class="screen-reader-text">You must log in to vote on the helpfulness of this note</span></a></div>
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<p>Just for information, wp_title has been reinstated:<br />
“<em>UPDATE 12 November – wp_title has been reinstated until alternative usages have been identified and a path forward for them defined.</em>”</p>
<p>Reference link as originally given by Andrew Klimek above <a href="https://make.wordpress.org/core/2015/10/20/document-title-in-4-4/" rel="nofollow ugc">https://make.wordpress.org/core/2015/10/20/document-title-in-4-4/</a></p>
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<a href="https://profiles.wordpress.org/DrewAPicture" rel="external nofollow" class="url">Drew Jaynes</a> </span><br />
<a class="comment-date" href="https://developer.wordpress.org/reference/hooks/wp_title/#comment-907"><br />
<time datetime="2015-10-22T19:59:07+00:00"><br />
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<p><strong>Basic Example</strong></p>
<p><em>In header.php:</em></p>
<pre class="wp-block-code hljs language-xml"><code class="wp-block-code hljs language-xml"><span class="hljs-tag"><<span class="hljs-name">title</span>></span><span class="hljs-tag"></<span class="hljs-name">title</span>></span></code></pre>
<p><em>In functions.php:</em></p>
<pre class="wp-block-code hljs language-php"><code class="wp-block-code hljs language-php"><span class="hljs-comment">/**
* Creates a nicely formatted and more specific title element text
* for output in head of document, based on current view.
*
* <span class="hljs-doctag">@param</span> string $title Default title text for current view.
* <span class="hljs-doctag">@param</span> string $sep Optional separator.
* <span class="hljs-doctag">@return</span> string Filtered title.
*/</span>
<span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">wpdocs_filter_wp_title</span><span class="hljs-params">( $title, $sep )</span> </span>{
<span class="hljs-keyword">global</span> $paged, $page;
<span class="hljs-keyword">if</span> ( is_feed() )
<span class="hljs-keyword">return</span> $title;
<span class="hljs-comment">// Add the site name.</span>
$title .= get_bloginfo( <span class="hljs-string">'name'</span> );
<span class="hljs-comment">// Add the site description for the home/front page.</span>
$site_description = get_bloginfo( <span class="hljs-string">'description'</span>, <span class="hljs-string">'display'</span> );
<span class="hljs-keyword">if</span> ( $site_description && ( is_home() || is_front_page() ) )
$title = <span class="hljs-string">"$title $sep $site_description"</span>;
<span class="hljs-comment">// Add a page number if necessary.</span>
<span class="hljs-keyword">if</span> ( $paged >= <span class="hljs-number">2</span> || $page >= <span class="hljs-number">2</span> )
$title = <span class="hljs-string">"$title $sep "</span> . sprintf( __( <span class="hljs-string">'Page %s'</span>, <span class="hljs-string">'twentytwelve'</span> ), max( $paged, $page ) );
<span class="hljs-keyword">return</span> $title;
}
add_filter( <span class="hljs-string">'wp_title'</span>, <span class="hljs-string">'wpdocs_filter_wp_title'</span>, <span class="hljs-number">10</span>, <span class="hljs-number">2</span> );</code></pre>
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<a href="https://profiles.wordpress.org/rafacarvalhido/" rel="external nofollow" class="url">Rafa Carvalhido</a> </span><br />
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<p>Example updated with the third parameter of the filter:</p>
<pre class="wp-block-code hljs language-php"><code class="wp-block-code hljs language-php">add_filter( <span class="hljs-string">'wp_title'</span>, <span class="hljs-string">'filter_function_name'</span>, <span class="hljs-number">10</span>, <span class="hljs-number">3</span> );
<span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">filter_function_name</span><span class="hljs-params">( $title, $sep, $seplocation )</span> </span>{
<span class="hljs-comment">// the magic</span>
<span class="hljs-keyword">return</span> $title;
}</code></pre>
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