网站目录导航能增加用户体验，点击上面的目录文字可以快速跳转到相关内容，适合长文章或者有特殊需求的文章使用。
通过正则表达式，自动文章内容提取带有H2标签的文字为目录索引
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01 |
$str = '<h3 class="archt"> |
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<strong>我是里面的内容</strong></h3><h3 class="archt2">我是第2个内容</h3><strong>我没有h3包在里面</strong>'; |
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preg_match_all('/<h3.*?>.*?(<[^>]+>)?([^<]+)(<\/[^>]+>)?<\/h3>/s', $str, $arr); |
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print_r($arr); |
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05 |
Array |
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06 |
( |
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07 |
[0] => Array |
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08 |
( |
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09 |
[0] => <h3 class="archt"> |
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10 |
<strong>我是里面的内容</strong></h3> |
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11 |
[1] => <h3 class="archt2">我是第2个内容</h3> |
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) |
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13 |
[1] => Array |
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14 |
( |
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15 |
[0] => <strong> |
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16 |
[1] => |
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) |
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18 |
[2] => Array |
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19 |
( |
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20 |
[0] => 我是里面的内容 |
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[1] => 我是第2个内容 |
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) |
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23 |
[3] => Array |
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24 |
( |
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25 |
[0] => </strong> |
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[1] => |
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) |
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) |
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29 |
function article_index($content) |
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{ |
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31 |
$matches = array(); |
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32 |
$ul_li = ''; |
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$r = '/<h3.*?>.*?(<[^>]+>)?([^<]+)(<\/[^>]+>)?<\/h3>/s'; |
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if(preg_match_all($r, $content, $matches)) |
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{ |
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foreach($matches[2] as $num => $title) |
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{ |
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$ul_li .= '<em>'.$title." </em>"; |
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} |
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} |
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return $ul_li; |
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} |
