xml - PHP DOM Document - get everything between two nodes -


i have part of xml loading in dom document:

<error n='\author'/> text 1  <formula type='inline'><math xmlns='http://www.w3.org/1998/math/mathml'><msup><mrow/> <mrow><mn>1</mn><mo>,</mo></mrow> </msup></math></formula> text 2  <formula type='inline'><math xmlns='http://www.w3.org/1998/math/mathml'><msup><mrow/> <mn>2</mn> </msup></math></formula>  <error n='\address' />

my goal nodevalue between 

<error n='\author' />

and 

<error n='\address' />

how can done?

i tested this:

$author_node = $xpath_xml->query("//error[@n='\author']/following-sibling::*[1]")->item(0); if ($author_node != null) {      $i              = 1;     $nextnodename   = "";     $author     = "";       while ($nextnodename != "error" && $i < 20) {         $nextnodename = $xpath_xml->query("//error[@n='\author']/following-sibling::*[$i]")->item(0)->tagname;          if ($nextnodename == "error")             continue;          $author .= $nextnode->nodevalue;     }

but getting formula content, not text between formulas. thank you.

the *only selects element nodes, not text nodes. <formula> elements selected. need use node(). use xpath directly selected needed nodes. explanation of kayessian method.

$dom = new domdocument(); $dom->loadxml($xml); $xpath = new domxpath($dom);  $nodes = $xpath->evaluate(   '//error[@n="\\author"][1]     /following-sibling::node()       [         count(           .|           //error[@n="\\author"][1]             /following-sibling::error[@n="\\address"][1]               /preceding-sibling::node()         )         =         count(           //error[@n="\\author"][1]             /following-sibling::error[@n="\\address"][1]               /preceding-sibling::node()         )       ]' );  $result = ''; foreach ($nodes $node) {   $result .= $node->nodevalue; } var_dump($result);

demo: https://eval.in/125494

if want save not text content, xml fragment, can use domdocument::savexml() node argument.

$result = ''; foreach ($nodes $node) {   $result .= $node->ownerdocument->savexml($node); } var_dump($result);

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