如何添加rel =&"lightbox&"仅链接到包含图像的链接，而不链接到其余的链接? [英] How to add rel="lightbox" only to links which are including an image and not the rest of the links?

问题描述

让我们说(在php中)我们有一个包含文本，链接和图像的变量:

Lets say that (in php) we have a variable which has text, links and images :

<a href="myimage_big"><img src="myimage.jpg" alt="pic" title="pic" border="0" /></a>

，我们想将rel ="light"添加到每个href标签中，如下所示:

and we want to add to every a href tag the rel="light" as follow :

<a rel="lightbox" href="myimage_big"><img src="myimage.jpg" alt="pic" title="pic" border="0" /></a>

如果变量名称为 $ mydata ，则使用str_replace我们可以按照以下步骤解决问题:

If the name of the variable is lets say $mydata then with str_replace we can do as follow to solve our problem :

$mydata = str_replace('<img ', '<img rel="lightbox"', $mydata);

到这里没事，但是其余不包含任何照片的a href链接呢?

Till here is all right, but what about the rest of the a href links that are not including any photo :

例子，

<a href="link1.php">link_no1</a>
<a href="link2.php">link_no2</a>

等等?对于这种不包含任何图像而是文本的链接，然后使用我们的str_replace代码，它们还将具有rel ="lightbox"属性，该属性不正确，我也不想这样做:

etc ? To this kind of links that are not including any image but text then with our str_replace code will also have a rel="lightbox" attribute that is not correct and i dont want :

<a rel="lightbox" href="link1.php">link_no1</a>

因此，我们如何将rel ="lightbox"仅适用于仅应用于包含某些图像的链接和不包含任何图像的那些链接，以不设置rel ="lightbox"属性..！?

So how we can apply the rel="lightbox" only to the links that are including some image and to those links that are not including any image to dont set the rel="lightbox" attribute ..!?

推荐答案

此正则表达式可以解决问题吗?

Does this regex solve the problem?

$str = '<a href="myimage_big"><img src="myimage.jpg" /></a>';

$str = preg_replace('~<a(?=[^>]+>\s*<img)~','<a rel="lightbox"',$str);

echo htmlspecialchars($str);

使用前瞻来检查<a ...>后跟

Using a lookahead to check, if the <a ...> is followed by <img

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