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Ниже я добавляю свой php-код для xml. Я хочу каждый раз создавать новый тег teacher и сохранять данные в этом родительском теге. Но, к сожалению, новые данные заменяют то же самое в позиции имени тега.

     $str = '<?xml version="1.0" encoding="UTF-8"?><?xml-stylesheet type="text/xsl" href="xsl.xsl"?><teachers></teachers>';
    $xml = simplexml_load_string($str);
    $name_info = htmlentities($name_info, ENT_COMPAT, 'UTF-8', false);
    $class_info = htmlentities($class_info, ENT_COMPAT, 'UTF-8', false);
    $section_info = htmlentities($section_info, ENT_COMPAT, 'UTF-8', false);
    $school_info = htmlentities($school_info, ENT_COMPAT, 'UTF-8', false);
    $session_info = htmlentities($session_info, ENT_COMPAT, 'UTF-8', false);
    $mark_sheet = htmlentities($mark_sheet, ENT_COMPAT, 'UTF-8', false);
    $semester_info = htmlentities($semester_info, ENT_COMPAT, 'UTF-8', false);

    $teacher = $xml->addChild('teacher');
    $teacher->addChild('teacher_name', $name_info);
    $teacher->addChild('class_info', $class_info);
    $teacher->addChild('section_info', $section_info);
    $teacher->addChild('school_info', $school_info);
    $teacher->addChild('session_info', $session_info);
    $teacher->addChild('marksheet', $mark_sheet);
    $teacher->addChild('semester_info', $semester_info);

    $doc = new DOMDocument('1.0');
    $doc->formatOutput = true;
    $doc->preserveWhiteSpace = true;
    $doc->loadXML($xml->asXML(), LIBXML_NOBLANKS);
    $doc->save('teacher.xml');
  

Вместо

    $xml = simplexml_load_string($str);
  

напишите это

   $xml = new SimpleXMLElement("teacher.xml", null, true);