PHP文章关键词相似短尾长尾内链替换方法介绍

<span>$keywordArr</span>=<span>array</span><span> (
    </span>0 => <span>array</span> ('title' => '李铁牛是铁牛山的铁牛','url' => 'http://www.444.com',),
    1 => <span>array</span> ('title' => '李铁牛是铁牛山','url' => 'http://www.333.com',),
    2 => <span>array</span> ('title' => '李铁牛','url' => 'http://www.222.com',),
    3 => <span>array</span> ('title' => '铁牛','url' => 'http://www.111.com',),);

这是我下面对内链关键词的举例哈。铁牛爱美女，李铁牛喜欢有情调的生活。铁牛也是牛，铁牛喜欢喝酒喜欢妹妹喜欢打拳健身，李铁牛也是牛，铁牛山的铁牛是李铁牛，李铁牛是铁牛山的铁牛。牛牛牛。

这是我下面对内链关键词的举例哈。<span><</span><span>a </span><span>href</span><span>="http://www.111.com"</span><span> target</span><span>="_blank"</span><span>><</span><span>strong </span><span>class</span><span>="keylink"</span><span>></span>铁牛<span></</span><span>strong</span><span>></</span><span>a</span><span>></span>爱美女，<span><</span><span>a </span><span>href</span><span>="http://www.222.com"</span><span> target</span><span>="_blank"</span><span>><</span><span>strong </span><span>class</span><span>="keylink"</span><span>></span>李铁牛<span></</span><span>strong</span><span>></</span><span>a</span><span>></span>喜欢有情调的生活。<span><</span><span>a </span><span>href</span><span>="http://www.111.com"</span><span> target</span><span>="_blank"</span><span>><</span><span>strong </span><span>class</span><span>="keylink"</span><span>></span>铁牛<span></</span><span>strong</span><span>></</span><span>a</span><span>></span>也是牛，铁牛喜欢喝酒喜欢妹妹喜欢打拳健身，<span><</span><span>a </span><span>href</span><span>="http://www.222.com"</span><span> target</span><span>="_blank"</span><span>><</span><span>strong </span><span>class</span><span>="keylink"</span><span>></span>李铁牛<span></</span><span>strong</span><span>></</span><span>a</span><span>></span>也是牛，铁牛山的铁牛是李铁牛，<span><</span><span>a </span><span>href</span><span>="http://www.444.com"</span><span> target</span><span>="_blank"</span><span>><</span><span>strong </span><span>class</span><span>="keylink"</span><span>></span>李铁牛是铁牛山的铁牛<span></</span><span>strong</span><span>></</span><span>a</span><span>></span>。牛牛牛。

<span>//</span><span>content 文字正文内容</span>
 <span>function</span> keylink(<span>$content</span><span>) {
    </span><span>//</span><span>$keywordArr 代表我们的关键词字典</span>
    <span>$keywordArr</span>=<span>array</span><span> (
    </span>0 => <span>array</span> ('title' => '李铁牛是铁牛山的铁牛','url' => 'http://www.444.com',),
    1 => <span>array</span> ('title' => '李铁牛是铁牛山','url' => 'http://www.333.com',),
    2 => <span>array</span> ('title' => '李铁牛','url' => 'http://www.222.com',),
    3 => <span>array</span> ('title' => '铁牛','url' => 'http://www.111.com',),<span>);
    </span><span>if</span>(!<span>$keywordArr</span>) <span>return</span> <span>$content</span><span>;
    </span><span>$data</span> = <span>$content</span><span>;
    </span><span>foreach</span>(<span>$keywordArr</span> <span>as</span> <span>$k</span>=><span>$v</span><span>) {
        </span><span>$quote</span> = <span>str_replace</span>(<span>array</span>("'", '-'), <span>array</span>("\'", '\-'), <span>preg_quote</span>(<span>$v</span>['title'<span>]));
        </span><span>$data</span> = <span>preg_replace</span>('\'(?!((<.*?)|(<a.*?)|(<strong.*?)))('.<span>$quote</span>.')(?!(([^<>]*?)>)|([^>]*?</a>)|([^>]*?</strong>))\'si', '<a href="'.<span>$v</span>['url'].'" target="_blank"><strong class="keylink">'.<span>$v</span>['title'].'</strong></a>', <span>$data</span>, 1);<span>//</span><span>数字1代表在正则中出现的替换频率</span>
        <span>if</span>(<span>$data</span> == '') <span>$data</span> = <span>$content</span><span>;
    }
    </span><span>return</span> <span>$data</span><span>;
}</span>