Replace spaces with between PRE tags

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I need to extend the functionality of the following code snippet to convert spaces -only- between PRE tags in a string containing html:

str_replace(\' \',\'&


                      
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                  南旧        
                
              
                            
                2021-01-23 11:25
              
            
            
                                                                       
$text = '<pre>test 1234 123</pre>';
$text2 = '<pre class="test">test 1234 123</pre>';

function testreplace($text) {
    return preg_replace_callback('/[\<]pre(.*)[\>](.*)[\<]\/pre[\>]/i', 
        create_function(
            '$matches',
            'return "<pre".$matches[1].">".str_replace(" ", "&nbsp;", $matches[2])."</pre>\n";'
        ), $text);
}

echo testreplace($text);
echo testreplace($text2);


Took me a while... But it works.
                                                                        
                                                        
            
            
              
                
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                  有刺的猬        
                
              
                            
                2021-01-23 11:25
              
            
            
                                                                       
You can use a DOM parser. Here is how you would do it using PHP native DOM functions:

<?php
$test = '
<p>abc 123</p>
<pre class="abc" id="pre123">abcedfg 12345</pre>
<p>abc 123</p>
<pre class="abc" id="pre456">abcedfg 12345</pre>
<div>
    <div>
        <div>
            <pre class="abc" id="pre789">abcedfg 12345</pre>
        </div>
    </div>
</div>
';
$dom = new DOMDocument("1.0");
$dom->loadHTML($test);
$xpath = new DOMXpath($dom);
$pre = $xpath->query("//pre");
foreach($pre as $e) {
    $e->nodeValue = str_replace(" ", "&nbsp;", $e->nodeValue);
}
echo $dom->saveHTML();


Output

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" "http://www.w3.org/TR/REC-html40/loose.dtd">
<html><body><p>abc 123</p>
<pre class="abc" id="pre123">abcedfg&nbsp;12345</pre>
<p>abc 123</p>
<pre class="abc" id="pre456">abcedfg&nbsp;12345</pre>
<div>
    <div>
        <div>
            <pre class="abc" id="pre789">abcedfg&nbsp;12345</pre>
        </div>
    </div>
</div></body></html>


EDIT:

I am not sure how to get rid of doctype/html/body tags. One possible solution that works on PHP >= 5.3.6 is to specify which node to output in the saveHTML() method. Other possibility is to use regex which I have avoided in the first place.
                                                                        
                                                        
            
            
              
                
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