更改 <a> 的 href 属性html 文档中的标签 [英] Change the href attribute of <a> tags in an html document
问题描述
我正在使用 file_get_contents 来获取某个文件的内容 - 到目前为止，这是有效的.
I'm using file_get_contents to get a certain file's contents -- so far that is working.
现在我想搜索文件并在显示之前将所有 <a href=" 替换为 <a href="site.php?url=文件.
Now I want to search the file and replace all <a href=" with <a href="site.php?url= before showing the file.
我该怎么做?我知道我应该使用某种 str_replace 甚至 preg_replace.但我不知道如何实际搜索并为我使用 file_get_contents 获取的文件执行此操作.
How can I do this? I know I should use some kind of str_replace or even preg_replace. But I don't know how to actually search and do it for the file I'm getting with file_get_contents.
推荐答案
file_get_contents 返回一个包含文件内容的字符串.
file_get_contents returns a string containing the file's content.
因此，您可以使用您想要的任何字符串操作函数来处理这个字符串，就像您谈到的那样.
So, you can work in this string using whichever string manipulation function you'd want, like the ones you talked about.
这样的事情，使用 str_replace，可能会做:
Something like this, using str_replace, would probably do :
$content = file_get_contents('http://www.google.com');
$new_content = str_replace('<a href="', '<a href="site.php?url=', $content);
echo $new_content;
但请注意，当该属性是 <a 标签的第一个时，它只会替换 href 属性中的 URL...
But note it will only replace the URL in the href attribute when that attribute is the first one of the <a tag...
使用正则表达式可能对您有更多帮助；但恐怕也不会完美……
Using a regex might help you a bit more ; but it probably won't be perfect either, I'm afraid...
如果您正在处理 HTML 文档并想要完整"解决方案，请使用 DOMDocument::loadHTML 并使用 DOM 操作方法可能是另一种(更复杂，但可能更强大)的解决方案.
If you are working with an HTML document and want a "full" solution, using DOMDocument::loadHTML and working with DOM manipulation methods might be another (a bit more complex, but probably more powerful) solution.
这两个问题的答案也可能对您有所帮助，具体取决于您愿意做什么:
The answers given to those two questions might also be able to help you, depending on what you are willing to do :
编辑:
如果要替换两个字符串，可以将数组传递给str_replace的前两个参数.例如:
If you want to replace two strings, you can pass arrays to the two first parameters of str_replace. For instance :
$new_content = str_replace(
array('<a href="', 'Pages'),
array('<a href="site.php?url=', 'TEST'),
$content);
这样:
- '
<a href="' 将替换为 '<a href="site.php?url=' - 和 '
Pages' 将被替换为 'TEST'
- '
<a href="' will be replaced by '<a href="site.php?url=' - and '
Pages' will get replaced by 'TEST'
并且，引用手册:
如果搜索和替换是数组，然后 str_replace() 从每个数组并使用它们进行搜索并替换主题.如果更换具有比 search 少的值，那么一个空字符串用于其余部分替换值.如果搜索是一个数组和替换是一个字符串，然后此替换字符串用于搜索的每一个价值.
If search and replace are arrays, then str_replace() takes a value from each array and uses them to do search and replace on subject . If replace has fewer values than search , then an empty string is used for the rest of replacement values. If search is an array and replace is a string, then this replacement string is used for every value of search .
如果你想替换 '<a href="' 的所有实例，那么 str_replace 默认就是这样做的 :-)
If you want to replace all instances of '<a href="', well, it's what str_replace does by default :-)
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