使用关联数组替换字符串中的多个单词，保持原始大小写不变

我想将数组与文本字符串进行匹配，其中与数组键匹配的单词将被替换为带有匹配数组值的标题的 span 标记。

我可以使用 str_ireplace 做到这一点，但随后匹配的单词会失去大小写：

$glossary = array(
    'word1' => '<span title="Explanation for Word 1">word1</span>',
    'word2' => '<span title="Explanation for Word 2">word2</span>',
    'word3' => '<span title="Explanation for Word 3">word3</span>'
);

$text = "This is a text about Word1. We also talk about word2 and WORD3. Also woRd3, word2 and WORD1";

list($keys, $values) = array_divide($glossary);

$result = str_ireplace($keys, $values, $text);

如前所述，这是可行的，但在此解决方案中，所有匹配的单词都将是小写的。

我想要实现的是：

'This is a text about <span title="Explanation for Word 1">Word1</span>. 
We also talk about <span title="Explanation for Word 2">word2</span> and
<span title="Explanation for Word 3">WORD3</span>.
Also <span title="Explanation for Word 3">woRd3</span>, 
<span title="Explanation for Word 2">word2</span>
and <span title="Explanation for Word 1">WORD1</span>'

进行替换并保持案件完好无损.

我发现了一个非常接近的很好的回复，但它只适用于在匹配的单词周围添加 span 标签，它不会为标题添加第二个变量（php str_ireplace 不丢失大小写).

我不知道足够的正则表达式（这让我眼花缭乱）来通过为跨度标题添加第二个变量来更改它：

$txt = 'Hi! How are you doing? Have some stars: * * *!';
$array_of_words = array('Hi!', 'stars', '*');

$pattern = '#(?<=^|\W)(' 
       . implode('|', array_map('preg_quote', $array_of_words))
       . ')(?=$|\W)#i';

echo preg_replace($pattern, 
      "<span style='background-color:#EEEE00'>$1</span>", $txt);

您可以循环运行此替换：

$txt = 'Hi! How are you doing? Have some stars: * * *!';
$glossary = array(
    'Hi!'   => 'title 1',
    'stars' => 'title 2',
    '*'     => 'title 3'
);
$result = $txt;
foreach ($glossary as $keyword => $title) {
    $pattern = '#(?<=^|\W)('.preg_quote($keyword).')(?=$|\W)#i';
    $result  = preg_replace($pattern, "<span title='{$title}'>$1</span>", $result);
}
echo $result;