get_meta_tags 函数

<h2>适用PHP版本</h2>
<p>PHP 4.3.0及以上版本。</p>

<h2>函数说明</h2>
<p>get_meta_tags() 函数从指定的文件或URL中读取并返回该文档的所有meta标签信息。返回的结果是一个包含meta标签属性和值的关联数组。</p>

<h2>函数语法</h2>
<p>get_meta_tags(string $filename, bool $use_include_path = false, int $context = 0): array</p>

<h2>参数</h2>
<p>
    <strong>$filename</strong> (必需) - 要从中获取meta标签的文件名或URL。
    <br>
    <strong>$use_include_path</strong> (可选) - 是否在include_path中查找文件。默认为false。
    <br>
    <strong>$context</strong> (可选) - 一个stream_context资源，用于指定HTTP请求的上下文。默认为0。
</p>

<h2>返回值</h2>
<p>返回一个关联数组，数组的键是meta标签的名称，值是对应的内容。</p>

<h2>示例</h2>
<p>以下示例展示了如何使用get_meta_tags()函数从URL中获取meta标签数据：</p>

<h2>示例代码的说明</h2>
<p>在此示例中，我们使用get_meta_tags()来获取网页的meta标签，并输出该网页的所有meta标签的内容。</p>

<pre>

';
print_r($tags);
echo '

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