Online PHP editor | rfc for pqjvP

@ 2019-01-27T03:48:18Z

<?php

$html = <<<'HTML'
<body>
  <main>
    <div>
      Lorem ipsum dolor sit amet consectetur adipisicing elit.
    </div>
    <p>
      Incidunt expedita laudantium aliquid unde explicabo.
    </p>
    <span>
      Velit eveniet alias minima vitae libero labore.
    </span>
  </main>
</body>
HTML;

$dom = new DOMDocument;
@$dom->loadHTML($html, LIBXML_HTML_NOIMPLIED | LIBXML_HTML_NODEFDTD);
$xpath = new DomXPath($dom);
$entry = $xpath->query('//main/node()');

$content = '';
foreach($entry as $element) {
  $content .= $dom->saveHTML($element);
}

/////////////////////////////////////////////////////////////////////////////////
// Как дальше искать внутри переменной «$content» (без xPath) ?
/////////////////////////////////////////////////////////////////////////////////

$subcontent = '';
foreach($content->getElementsByTagName('*') as $node) {
  $subcontent .= $dom->saveHTML($node);
}
echo $subcontent; // не работает

Output for git.master, git.master_jit, rfc.property-hooks: Fatal error: Uncaught Error: Call to a member function getElementsByTagName() on string in /in/pqjvP:34 Stack trace: #0 {main} thrown in /in/pqjvP on line 34
Process exited with code 255.

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