PHP- Preg_replace tag name and its contents

[baig772]

I have a string like
string(8234) "<style>.{ margin-bottom:10px; float:left; display: inline-block; width:56%; text-align:left; padding-right:20px; padding-left:20px; } . > p { display: table-cell; height: 150px; vertical-align: middle; }..................</style>.................
I want to remove <style> tag and all its contents.
I have tried

$description = $product_info['description']; // the string with style tag
$text = preg_replace('/<\s*style.+?<\s*\/\s*style.*?>/si', ' ', $description );
echo $text;

but it shows the same string without removing <style> tag.
I have also tried to replace only <style> tag by doing

$text    = str_replace("<style>", "", $description);

but this also doesn't work at all. I am seeing the same string again and again. I have also tried it with DOMParser

 $doc =   new DOMDocument();
 $doc->loadHTML($description);
 $xpath = new DOMXPath($doc);
 foreach ($xpath->query('//style') as $node) {
    $node->parentNode->removeChild($node);
 }
 $text    =    $doc->saveHTML();

but in all cases, output is the same with <style> and its contents

[cereal]

Hi,
you could list the items in the head and body elements and then, if you catch the style child, you remove it. This seems to works fine for me:

<?php

/**
 * Remove tag from DOM.
 * 
 * @see http://php.net/manual/en/domnode.removechild.php
 *      Read the comments about the loops
 * @param  DomDocument $doc
 * @param  string      $tag
 * @param  string      $element
 * @return void
 */
function removeTag(DomDocument $doc, $tag, $element = 'body')
{
    $section = $doc->getElementsByTagName($element)->item(0);
    $tag = $section->getElementsByTagName($tag);

    if($tag->length > 0)
    {
        foreach($tag as $node)
            $data[] = $node;

        foreach($data as $n)
            $section->removeChild($n);
    }

    return ;
}

$file = 'index.html';
$doc  = new DOMDocument();
$doc->loadHTMLFile($file);

removeTag($doc, 'style', 'head');
removeTag($doc, 'style', 'body');

$doc->saveHTMLFile($file);

You need to use a loop because:

You can't remove DOMNodes from a DOMNodeList as you're iterating over them in a foreach loop.

See the documentation for more notes:

• http://php.net/manual/en/domnode.removechild.php