PHP限制HTML内容中图片必须是本站的方法_php技巧

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Release: 2016-05-16 20:13:57
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本文实例讲述了PHP限制HTML内容中图片必须是本站的方法。分享给大家供大家参考。具体实现方法如下:

1. PHP代码如下:

<&#63;php
$dom = new DOMDocument;
$dom->loadHTML(file_get_contents('input.html'));
$xpath = new DOMXpath($dom);
$img = $xpath->query('//img');
foreach($img as $i) {
  $url = parse_url($i->getAttribute('src'));
  if(isset($url['host']) && in_array($url['host'], array('yourdomain.com', 'www.yourdomain.com')) == false) {
    // show an error
      // -- or --
      // remove the tag: $i->parent->removeChild($i)
    echo sprintf('[FAIL] %s' . PHP_EOL, $i->getAttribute('src'));
  }
  else {
    echo sprintf('[PASS] %s' . PHP_EOL, $i->getAttribute('src'));
  }
}

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2. 测试HTML代码:

<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit.</p>
<p><img  src="/image.jpg" alt="PHP限制HTML内容中图片必须是本站的方法_php技巧" ></p>
<p><img  src="http://yourdomain.com/image.jpg" alt="PHP限制HTML内容中图片必须是本站的方法_php技巧" ></p>
<p><img  src="http://www.yourdomain.com/image.jpg" alt="PHP限制HTML内容中图片必须是本站的方法_php技巧" ></p>
<p><img  src="http://otherdomain.com/image.jpg" alt="PHP限制HTML内容中图片必须是本站的方法_php技巧" ></p>

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3. 运行结果:

[PASS] /image.jpg
[PASS] http://yourdomain.com/image.jpg
[PASS] http://www.yourdomain.com/image.jpg
[FAIL] http://otherdomain.com/image.jpg

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希望本文所述对大家的php程序设计有所帮助。

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