在PHP中,我如何使用DOMDocument类来替换IMG标签的src =属性? [英] In PHP, how can I use the DOMDocument class to replace the src= attribute of an IMG tag?
问题描述
能够替换HTML IMG标签的src =属性而不会丢失任何其他属性通常很有用。什么是这样做的快速,非正则表达式的方式?
It's often useful to be able to swap out the src= attribute of an HTML IMG tag without losing any of the other attributes. What's a quick, non-regex way of doing this?
我不想使用RegEx的原因是:
The reasons I don't want to use RegEx are:
- 它不太可读。每次我需要解释一个新案例时,我都不想花20分钟解密一个模式。
- 我计划修改此函数以在缺失时添加宽度和高度属性。一个简单的RegEx字符串替换将不易于修改。
以下是上下文:我有一堆RSS提要每个帖子都包含一个图片。我想用空白图片替换这些图片,但保持HTML不受影响:
Here's the context: I have a bunch of RSS feed posts that each contain one image. I would like to replace these images with blank images, but keep the HTML otherwise unaffected:
$raw_post_html = "<h2>Feed Example</h2>
<p class='feedBody'>
<img src='http://premium.mofusecdn.com/6ff7098b3c8561d70c0af16d30e57d4e/cache/other/48da8425bc54af2d5d022f28cc8b021c.200.0.0.png' alt='Feed Post Image' width='350' height='200' />
Feed Body Content
</p>";
echo replace_img_src($raw_post_html, "http://cdn.company.org/blank.gif");
推荐答案
这就是我想到的。它使用PHP DOM API创建一个小型的HTML文档,然后将XML保存为IMG元素。
$ b
This is what I've come up with. It uses the PHP DOM API to create a tiny HTML document, then saves the XML for just the IMG element.
function replace_img_src($original_img_tag, $new_src_url) {
$doc = new DOMDocument();
$doc->loadHTML($original_img_tag);
$tags = $doc->getElementsByTagName('img');
if(count($tags) > 0)
{
$tag = $tags->item(0);
$tag->setAttribute('src', $new_src_url);
return $doc->saveHTML($tag);
}
return false;
}
注意:5.3之前版本的PHP。 6, $ doc-> saveHTML($ tag)
可以更改为 $ doc-> saveXML($ tag)
。
Note: In versions of PHP before 5.3.6, $doc->saveHTML($tag)
can be changed to $doc->saveXML($tag)
.
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