Question

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(' ',' ',$str);

For example, if $str cotained the following string;

<p>abc 123</p>
<pre class="abc" id="123">abcedfg 12345</pre>

it would be converted to:

<p>abc 123</p>
<pre class="abc" id="123">abcedfg&nbsp;12345</pre>

similarly;

<p>abc 123</p>
<pre>abcedfg 12345</pre>

would be converted to:

<p>abc 123</p>
<pre>abcedfg&nbsp;12345</pre>

Answer 1

$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.