PHP 正则表达式替换图像 SRC 属性 [英] PHP Regex Replace Image SRC Attribute

问题描述

我试图找到一个正则表达式，它可以让我替换图像中的 SRC 属性.这是我所拥有的:

I'm trying to find a regular expression that would allow me replace the SRC attribute in an image. Here is what I have:

function getURL($matches) {
  global $rootURL;
  return $rootURL . "?type=image&URL=" . base64_encode($matches['1']);
}

$contents = preg_replace_callback("/<img[^>]*src *= *[\"']?([^\"']*)/i", getURL, $contents);

在大多数情况下，这很有效，除了当 $contents 回显到屏幕时 src=" 属性之前的任何内容都会被消除.最后，SRC 正确更新，更新后的图像 URL 后的所有属性都会返回到屏幕.

For the most part, this works well, except that anything before the src=" attribute is eliminated when $contents is echoed to the screen. In the end, SRC is updated properly and all of the attributes after the updated image URL are returned to the screen.

我对使用 DOM 或 XML 解析库不感兴趣，因为这是一个很小的应用程序.

I am not interested in using a DOM or XML parsing library, since this is such a small application.

如何修复正则表达式以便仅更新 SRC 的值?

How can I fix the regex so that only the value for SRC is updated?

感谢您的宝贵时间！

推荐答案

再进行一次分组并将其添加到返回值之前?

Do another grouping and prepend it to the return value?

function getURL($matches) {
  global $rootURL;
  return $matches[1] . $rootURL . "?type=image&URL=" . base64_encode($matches['2']);
}

$contents = preg_replace_callback("/(<img[^>]*src *= *[\"']?)([^\"']*)/i", getURL, $contents);

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