扫描字符串并用链接替换标签 [英] scan a string and replace tags with links

问题描述

我有一个像这样的数组:

I have an array like this:

$keywords = array( 'php', 'html', 'css' );

我有一个数据库查询来返回一个段落，该段落包含数组中先前提到的关键字.

I have a db query to return a paragraph, which contains the keywords previously mentioned in the array.

我有一个这样的链接模板:

I have a link template like this:

$linktpl = '<a href="%s" title="%s">%s</a>';

我希望有一个简单的函数可以随时扫描该段落，只要它找到一个关键字就可以使用上面的链接模板将其转换为链接.

I want a simple function to scan that paragraph and on the fly, whenever it finds a keyword it converts it to a link using the link template above.

如果可能的话，我希望它考虑单数和复数形式(例如框架和框架)

And if possible I want it to take into account singular and plural (like framework and frameworks)

SEO进行自动关键字链接是否安全?

and is it safe for SEO to make this automated keyword linking?

有什么想法吗?

推荐答案

$string = 'this is the php test subject.';

// associate keywords with their urls
$urls = array(
'php' => 'http://www.php.net',
// and etc...
);

// this callback will take the matches from preg and generate the
// html link making use of the $urls dictionary
$linker = function($matches) use($urls) {
    $urlKey = strtolower($matches[1]);
    return sprintf(
      '<a href="%s" title="%s">%s</a>',
      $urls[$urlKey], $matches[1], $matches[1]
    );
};

// do the magic
$regex = '/\b(' . preg_quote(implode('|', $keywords), '/') . ')\b/i';
preg_replace_callback($regex, $linker, $string);

使用正则表达式的优势在于我们可以利用 \ b 修饰符来确保捕获诸如(php)， PHP之类的情况.或 phpp 并正确处理它们.

Advantage of using regular expressions is that we can leverage the \b modifier to ensure we catch cases such as (php), PHP., or phpp and deal with them properly.

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