PHP: Replace DOMElement with DOMText node - php

Question

I want to create some customised tags for translating, for instance
<trad>SOMETHING</trad>
I've also got a file with some $GLOBALS variable, like:
$GLOBALS['SOMETHING'] = 'Some text';
$GLOBALS['SOMETHINGELSE'] = 'Some other text';
So I've been able to show my translation in this way:
$string = "<trad>SOMETHING</trad>";
$string = preg_replace('/<trad[^>]*?>([\\s\\S]*?)<\/trad>/','\\1', $string);
echo $GLOBALS[$string];
This works perfectly, but when I've got something more complex like the following code, or when I have more occurences of this tag, I'm not able to let it work:
$string = "Lorem ipsum <trad>SOMETHING</trad> <h1>Hello</h1> <trad>SOMETHINGELSE</trad>";
I ideally want to create a new variale $string, replacing the values that I found into my tags and being able to show it with a simple echo.
So I want an output like this with:
echo $string;
//output: Lorem ipsum Some text <h1>Hello</h1> Some other text
Can you guys help me?

Answer 1

Regex is not a valid approach for treating HTMLstring. Here we are using DOMDocument instead of Regex to achieve desired output. The last step of strip_tags has been done to achieve desired output, there will no need in case a valid HTML string is supplied to loadHTML, in that case saveHTML($node) will do the job.
Try this code snippet here
<?php
ini_set('display_errors', 1);
libxml_use_internal_errors(true);
$array["SOMETHING"]="some text";
$array["SOMETHINGELSE"]="some text other";
$string = "Lorem ipsum <trad>SOMETHING</trad> <h1>Hello</h1> <trad>SOMETHINGELSE</trad>";
$domDocument = new DOMDocument();
$domDocument->loadHTML($string,LIBXML_HTML_NOIMPLIED|LIBXML_HTML_NODEFDTD);
$results=$domDocument->getElementsByTagName("trad");
do
{
foreach($results as $result)
{
$result->parentNode->replaceChild($domDocument->createTextNode($array[trim($result->nodeValue)]),$result);
}
}
while($results->length>0);
echo strip_tags($domDocument->saveHTML(),"<h1>");