In PHP, how to remove a specific class from an html tag?

Question

The following line is given in PHP:

$html = "<div>
<p><span class='test1 test2 test3'>text 1</span></p>
<p><span class='test1 test2'>text 2</span></p>
<p><span class='test1'>text 3</span></p>
<p><span class='test1 test3 test2'>text 4</span></p>
</div>";

I just want to either delete or delete any class with "test2", so the result will be as follows:

<div>
<p><span class=''>text 1</span></p>
<p><span class=''>text 2</span></p>
<p><span class='test1'>text 3</span></p>
<p><span class=''>text 4</span></p>
</div>

if you delete the item:

<div>
<p>text 1</p>
<p>text 2</p>
<p><span class='test1'>text 3</span></p>
<p>text 4</p>
</div>

I'm glad to use a regex expression or something like PHP Simple HTML DOM Parser, but I don't know how to use it. And with a regex, I know how to find an element, but not the specific attribute associated with it, especially if there are several attributes like my example above. Any ideas?

Answer 1

$notest2 = preg_replace(
         "/class\s*=\s*'[^\']*test2[^\']*'/", 
         "class=''", 
         $src);

WITH.

Answer 2

using PHP Simple HTML DOM Parser

! simple_html_dom.php .

:

include('../simple_html_dom.php');

$html = str_get_html("<div><p><span class='test1 test2 test3'>text 1</span></p>
<p><span class='test1 test2'>text 2</span></p>
<p><span class='test1'>text 3</span></p>
<p><span class='test1 test3 test2'>text 4</span></p></div>");

1:

foreach($html->find('span[class*="test2"]') as $e)
$e->class = '';

echo $html;

2:

foreach($html->find('span[class*="test2"]') as $e)
$e->parent()->innertext = $e->plaintext;

echo $html;

Answer 3

DOMDocument - , DOM- . DOM xpath (-) :

// Build our DOMDocument, and load our HTML
$doc = new DOMDocument();
$doc->loadHTML($html);

// Preserve a reference to our DIV container
$div = $doc->getElementsByTagName("div")->item(0);

// New-up an instance of our DOMXPath class
$xpath = new DOMXPath($doc);

// Find all elements whose class attribute has test2
$elements = $xpath->query("//*[contains(@class,'test2')]");

// Cycle over each, remove attribute 'class'
foreach ($elements as $element) {
    // Empty out the class attribute value
    $element->attributes->getNamedItem("class")->nodeValue = '';
    // Or remove the attribute entirely
    // $element->removeAttribute("class");
}

// Output the HTML of our container
echo $doc->saveHTML($div);

Answer 4

DOM Parser, . , class test2 class (strpos()), class .

You can also use regular expressions for this - a much shorter way. Just find and replace ( preg_replace () ) using the following expression:#class=".*?test2.*?"#is