Php 替换内部的所有空间<；a>；标签

我已经为此挣扎了一段时间，希望有人能帮我。例如，我需要使用正则表达式替换锚标记内的所有空格

Hello this is a string, check this <a href="http://www.google.com">Google is cool</a> Oh and this <a href="http://www.google.com/blah blah">Google is cool</a> That is all

您好，这是一个字符串，请检查这个哦，这就是全部

需要成为

Hello this is a string, check this <a[SPACE]href="http://www.google.com">Google[SPACE]is[SPACE]cool</a> Oh and this <a[SPACE]href="http://www.google.com/blah[SPACE]blah">Google[SPACE]is[SPACE]cool</a> That is all

您好，这是一个字符串，请检查这个哦，这就是全部

我们处理的是regex和XMLish字符串-尽管以下内容适用于给定的测试用例，但不同的测试用例的里程可能会有所不同；小心使用

<?
function replace($matches)
{
        return preg_replace("/ /", "[SPACE]", $matches[0]);
}
$s = 'Hello this is a string, check this <a href="http://www.google.com">Google is cool</a> Oh and this <a href="http://www.google.com/blah blah">Google is cool</a> That is all';
echo "Before::......\n\n$s\n\nAfter::......\n\n";
echo preg_replace_callback('#<a\b(.+?)</a>#', 'replace', $s);
echo "\n";
?>

预更换(
“/（哦，这就是全部”
);
我不知道该怎么做，因为我像瘟疫一样避免使用正则表达式。与其给你一个真正的答案，我倒不如建议你使用PHP的内置函数str_replace（）。-尽管你可能需要使用正则表达式，但我认为没有理由这样做。
Before::......

Hello this is a string, check this <a href="http://www.google.com">Google is cool</a> Oh and this <a href="http://www.google.com/blah blah">Google is cool</a> That is all

After::......

Hello this is a string, check this <a[SPACE]href="http://www.google.com">Google[SPACE]is[SPACE]cool</a> Oh and this <a[SPACE]href="http://www.google.com/blah[SPACE]blah">Google[SPACE]is[SPACE]cool</a> That is all

preg_replace(
  '/(<a .+?<\/a>)/e',
  'str_replace(" ", "[SPACE]", "\1")',
  'Hello this is a string, check this <a href="http://www.google.com">Google is cool</a> Oh and this <a href="http://www.google.com/blah blah">Google is cool</a> That is all'
);