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PHP nodeValue strips html tags - innerHTML alternative?
$page = $_POST['page'];
$json = $_POST['json'];

$doc = new DOMDocument();
$doc = DOMDocument::loadHTMLFile($page);

$xpath = new DOMXPath($doc);
$entries = $xpath->query('//*[@class="editable"]');
$edits = json_decode($json, true);
$num_edits = count($edits);

for($i=0; $i<$num_edits; $i++)
{
    $entries->item($i)->nodeValue = $edits[$i]; // nodeValue strips html tags
}

$doc->saveHTMLFile($page);