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我正在尝试构建一个函数，它可以清除 HTML 文档中包含空内容或没有属性的所有元素，并且我想要 igonre<br>和<hr>标签。

这是我当前的代码。

<?php

function clean($html){
    $dom = new DOMDocument();
    $dom->loadHTML($html)
    $xpath = new DOMXPath($dom);

    while (($node_list = $xpath->query('//*[not(*) and not(@*) and not(text()[normalize-space()])]')) && $node_list->length) {
        foreach ($node_list as $node) {
            $node->parentNode->removeChild($node);
        }
    }

    return $dom->saveHTML();

}

我如何选择忽略br和hr使用 xpath 查询的所有节点。

示例输入示例：

<!DOCTYPE html>
<html>
<head>
    <title></title>
</head>
<body>
    <p><strong><span style="font-size:16px;">Specifications:</span></strong><br>
    <span style="font-size:16px;">1. Material: Polymer</span><br>
    <span style="font-size:16px;">2. Weight: 7.94oz / 225g</span><br>
    <span style="font-size:16px;">3. Color: <strong><span style="color:#ff0000;background-color:#ffffff;">Black / White / Blue /</span></strong> <strong><span style="color:#ff0000;background-color:#ffffff;">Red</span></strong></span><br>
    <span style="font-size:16px;">4. Dimensions: (7.48 x 7.87 x 3.35)" / (19 x 20 x 8.5)cm (L x W x H)</span><br>
    <span style="font-size:16px;">5. Driver Unit: 2 Speakers(57mm)</span><br>
    <span style="font-size:16px;">6. Transducer Type: Dynamic</span><br>
    <span style="font-size:16px;">7. Bluetooth Version: V4.1</span><br>
    <span style="font-size:16px;">8. Operating Distance: up to 10m(Free Space)</span><br>
    <span style="font-size:16px;">9. Profiles: A2DP,AVRCP,HSP,HFP</span><br>
    <span style="font-size:16px;">10. Speaker Impendence: 16Ω</span><br>
    <span style="font-size:16px;">11. Frequency Response: 20Hz-20KHz</span><br>
    <span style="font-size:16px;">12. Sensitivity: 110dB</span><br>
    <span style="font-size:16px;">13. THD: &lt;0.1%</span><br>
    <span style="font-size:16px;">14. <span style="color:#6600ff;">Support Micro SD Card Capacity</span>: up to 32GB</span><br>
    <span style="font-size:16px;">15. Micro SD Card Play Time: about 15 hours</span><br>
    <span style="font-size:16px;">16. FM Play Time: about 15 hours</span><br>
    <span style="font-size:16px;">17. Bluetooth Music Time: about 40 hours</span><br>
    <span style="font-size:16px;">18. Talk Time: about 45 hours</span><br>
    <span style="font-size:16px;">19. Standby Time: 1620 hours(around 50Days)</span><br>
    <span style="font-size:16px;">20. Fully Charged Time: about 2 hours</span><br>
    <span style="font-size:16px;">21. Operating Environment: -10~50℃&lt;/span></p><span style="font-size:16px;"></span>
    <ul>
        <li><span style="font-size:16px;"></span></li>
        <li><span style="font-size:16px;"></span></li>
        <li><span style="font-size:16px;"></span></li>
    </ul>
    <p></p>
</body>
</html>

由于某些没有人知道的原因，这部分没有内容：

我想删除它，同时保留断线。

当前输出示例：

<html>
<head>
    <title></title>
</head>
<body>
    <p><strong><span style="font-size:16px;">Specifications:</span></strong> <span style="font-size:16px;">1. Material: Polymer</span> <span style="font-size:16px;">2. Weight: 7.94oz / 225g</span> <span style="font-size:16px;">3. Color: <strong><span style="color:#ff0000;background-color:#ffffff;">Black / White / Blue /</span></strong> <strong><span style="color:#ff0000;background-color:#ffffff;">Red</span></strong></span> <span style="font-size:16px;">4. Dimensions: (7.48 x 7.87 x 3.35)" / (19 x 20 x 8.5)cm (L x W x H)</span> <span style="font-size:16px;">5. Driver Unit: 2 Speakers(57mm)</span> <span style="font-size:16px;">6. Transducer Type: Dynamic</span> <span style="font-size:16px;">7. Bluetooth Version: V4.1</span> <span style="font-size:16px;">8. Operating Distance: up to 10m(Free Space)</span> <span style="font-size:16px;">9. Profiles: A2DP,AVRCP,HSP,HFP</span> <span style="font-size:16px;">10. Speaker Impendence: 16Ω</span> <span style="font-size:16px;">11. Frequency Response: 20Hz-20KHz</span> <span style="font-size:16px;">12. Sensitivity: 110dB</span> <span style="font-size:16px;">13. THD: &lt;0.1%</span> <span style="font-size:16px;">14. <span style="color:#6600ff;">Support Micro SD Card Capacity</span>: up to 32GB</span><span style="font-size:16px;">15. Micro SD Card Play Time: about 15 hours</span> <span style="font-size:16px;">16. FM Play Time: about 15 hours</span> <span style="font-size:16px;">17. Bluetooth Music Time: about 40 hours</span> <span style="font-size:16px;">18. Talk Time: about 45 hours</span><span style="font-size:16px;">19. Standby Time: 1620 hours(around 50Days)</span><span style="font-size:16px;">20. Fully Charged Time: about 2 hours</span><span style="font-size:16px;">21. Operating Environment: -10~50℃&lt;/span></p>
</body>
</html>

所需的输出示例：

<html>
<head>
    <title></title>
</head>
<body>
    <p><strong><span style="font-size:16px;">Specifications:</span></strong><br>
    <span style="font-size:16px;">1. Material: Polymer</span><br>
    <span style="font-size:16px;">2. Weight: 7.94oz / 225g</span><br>
    <span style="font-size:16px;">3. Color: <strong><span style="color:#ff0000;background-color:#ffffff;">Black / White / Blue /</span></strong> <strong><span style="color:#ff0000;background-color:#ffffff;">Red</span></strong></span><br>
    <span style="font-size:16px;">4. Dimensions: (7.48 x 7.87 x 3.35)" / (19 x 20 x 8.5)cm (L x W x H)</span><br>
    <span style="font-size:16px;">5. Driver Unit: 2 Speakers(57mm)</span><br>
    <span style="font-size:16px;">6. Transducer Type: Dynamic</span><br>
    <span style="font-size:16px;">7. Bluetooth Version: V4.1</span><br>
    <span style="font-size:16px;">8. Operating Distance: up to 10m(Free Space)</span><br>
    <span style="font-size:16px;">9. Profiles: A2DP,AVRCP,HSP,HFP</span><br>
    <span style="font-size:16px;">10. Speaker Impendence: 16Ω</span><br>
    <span style="font-size:16px;">11. Frequency Response: 20Hz-20KHz</span><br>
    <span style="font-size:16px;">12. Sensitivity: 110dB</span><br>
    <span style="font-size:16px;">13. THD: &lt;0.1%</span><br>
    <span style="font-size:16px;">14. <span style="color:#6600ff;">Support Micro SD Card Capacity</span>: up to 32GB</span><br>
    <span style="font-size:16px;">15. Micro SD Card Play Time: about 15 hours</span><br>
    <span style="font-size:16px;">16. FM Play Time: about 15 hours</span><br>
    <span style="font-size:16px;">17. Bluetooth Music Time: about 40 hours</span><br>
    <span style="font-size:16px;">18. Talk Time: about 45 hours</span><br>
    <span style="font-size:16px;">19. Standby Time: 1620 hours(around 50Days)</span><br>
    <span style="font-size:16px;">20. Fully Charged Time: about 2 hours</span><br>
    <span style="font-size:16px;">21. Operating Environment: -10~50℃&lt;/span></p>
</body>
</html>

先感谢您。

4

1 回答 1

1

严格来说，这个 XPath 将从你的 body 中选择空节点（保留你的 br、hr 和 strong 元素）。

//body//*[name()!='br' and name()!='hr' and name()!='strong'][string(normalize-space())='']

输出：9 个节点。

于 2020-04-04T13:02:34.440 回答