Which piece of code is responsible for displaying the joomla header?

Question

PHP

Hello, I'm trying to create a static page with a unique design. Created a material, copied it and gave it an alternative "usual-page" layout. Now I'm trying to change the type of material and I can't figure out which piece of code is responsible for displaying everything above the article title.

Here is the default material code

<?php
/**
 * @package     Joomla.Site
 * @subpackage  com_content
 *
 * @copyright   Copyright (C) 2005 - 2017 Open Source Matters, Inc. All rights reserved.
 * @license     GNU General Public License version 2 or later; see LICENSE.txt
 */

defined('_JEXEC') or die;

JHtml::addIncludePath(JPATH_COMPONENT . '/helpers');

// Create shortcuts to some parameters.
$params  = $this->item->params;
$images  = json_decode($this->item->images);
$urls    = json_decode($this->item->urls);
$canEdit = $params->get('access-edit');
$user    = JFactory::getUser();
$info    = $params->get('info_block_position', 0);

// Check if associations are implemented. If they are, define the parameter.
$assocParam = (JLanguageAssociations::isEnabled() && $params->get('show_associations'));
JHtml::_('behavior.caption');

?>

<div class="item-page<?php echo $this->pageclass_sfx; ?>" itemscope itemtype="https://schema.org/Article">
  <meta itemprop="inLanguage" content="<?php echo ($this->item->language === '*') ? JFactory::getConfig()->get('language') : $this->item->language; ?>" />
  <?php if ($this->params->get('show_page_heading')) : ?>
  <div class="page-header">
    <h1> <?php echo $this->escape($this->params->get('page_heading')); ?> </h1>
  </div>
  <?php endif;
  if (!empty($this->item->pagination) && $this->item->pagination && !$this->item->paginationposition && $this->item->paginationrelative)
  {
    echo $this->item->pagination;
  }
  ?>

  <?php // Todo Not that elegant would be nice to group the params ?>
  <?php $useDefList = ($params->get('show_modify_date') || $params->get('show_publish_date') || $params->get('show_create_date')
  || $params->get('show_hits') || $params->get('show_category') || $params->get('show_parent_category') || $params->get('show_author') || $assocParam); ?>

  <?php if (!$useDefList && $this->print) : ?>
    <div id="pop-print" class="btn hidden-print">
      <?php echo JHtml::_('icon.print_screen', $this->item, $params); ?>
    </div>
    <div class="clearfix"> </div>
  <?php endif; ?>
  <?php if ($params->get('show_title') || $params->get('show_author')) : ?>
  <div class="page-header">
    <?php if ($params->get('show_title')) : ?>
      <h2 itemprop="headline">
        <?php echo $this->escape($this->item->title); ?>
      </h2>
    <?php endif; ?>
    <?php if ($this->item->state == 0) : ?>
      <span class="label label-warning"><?php echo JText::_('JUNPUBLISHED'); ?></span>
    <?php endif; ?>
    <?php if (strtotime($this->item->publish_up) > strtotime(JFactory::getDate())) : ?>
      <span class="label label-warning"><?php echo JText::_('JNOTPUBLISHEDYET'); ?></span>
    <?php endif; ?>
    <?php if ((strtotime($this->item->publish_down) < strtotime(JFactory::getDate())) && $this->item->publish_down != JFactory::getDbo()->getNullDate()) : ?>
      <span class="label label-warning"><?php echo JText::_('JEXPIRED'); ?></span>
    <?php endif; ?>
  </div>
  <?php endif; ?>
  <?php if (!$this->print) : ?>
    <?php if ($canEdit || $params->get('show_print_icon') || $params->get('show_email_icon')) : ?>
      <?php echo JLayoutHelper::render('joomla.content.icons', array('params' => $params, 'item' => $this->item, 'print' => false)); ?>
    <?php endif; ?>
  <?php else : ?>
    <?php if ($useDefList) : ?>
      <div id="pop-print" class="btn hidden-print">
        <?php echo JHtml::_('icon.print_screen', $this->item, $params); ?>
      </div>
    <?php endif; ?>
  <?php endif; ?>

  <?php // Content is generated by content plugin event "onContentAfterTitle" ?>
  <?php echo $this->item->event->afterDisplayTitle; ?>

  <?php if ($useDefList && ($info == 0 || $info == 2)) : ?>
    <?php // Todo: for Joomla4 joomla.content.info_block.block can be changed to joomla.content.info_block ?>
    <?php echo JLayoutHelper::render('joomla.content.info_block.block', array('item' => $this->item, 'params' => $params, 'position' => 'above')); ?>
  <?php endif; ?>

  <?php if ($info == 0 && $params->get('show_tags', 1) && !empty($this->item->tags->itemTags)) : ?>
    <?php $this->item->tagLayout = new JLayoutFile('joomla.content.tags'); ?>

    <?php echo $this->item->tagLayout->render($this->item->tags->itemTags); ?>
  <?php endif; ?>

  <?php // Content is generated by content plugin event "onContentBeforeDisplay" ?>
  <?php echo $this->item->event->beforeDisplayContent; ?>

  <?php if (isset($urls) && ((!empty($urls->urls_position) && ($urls->urls_position == '0')) || ($params->get('urls_position') == '0' && empty($urls->urls_position)))
    || (empty($urls->urls_position) && (!$params->get('urls_position')))) : ?>
  <?php echo $this->loadTemplate('links'); ?>
  <?php endif; ?>
  <?php if ($params->get('access-view')) : ?>
  <?php echo JLayoutHelper::render('joomla.content.full_image', $this->item); ?>
  <?php
  if (!empty($this->item->pagination) && $this->item->pagination && !$this->item->paginationposition && !$this->item->paginationrelative) :
    echo $this->item->pagination;
  endif;
  ?>
  <?php if (isset ($this->item->toc)) :
    echo $this->item->toc;
  endif; ?>
  <div itemprop="articleBody">
    <?php echo $this->item->text; ?>
  </div>

  <?php if ($info == 1 || $info == 2) : ?>
    <?php if ($useDefList) : ?>
        <?php // Todo: for Joomla4 joomla.content.info_block.block can be changed to joomla.content.info_block ?>
      <?php echo JLayoutHelper::render('joomla.content.info_block.block', array('item' => $this->item, 'params' => $params, 'position' => 'below')); ?>
    <?php endif; ?>
    <?php if ($params->get('show_tags', 1) && !empty($this->item->tags->itemTags)) : ?>
      <?php $this->item->tagLayout = new JLayoutFile('joomla.content.tags'); ?>
      <?php echo $this->item->tagLayout->render($this->item->tags->itemTags); ?>
    <?php endif; ?>
  <?php endif; ?>

  <?php
  if (!empty($this->item->pagination) && $this->item->pagination && $this->item->paginationposition && !$this->item->paginationrelative) :
    echo $this->item->pagination;
  ?>
  <?php endif; ?>
  <?php if (isset($urls) && ((!empty($urls->urls_position) && ($urls->urls_position == '1')) || ($params->get('urls_position') == '1'))) : ?>
  <?php echo $this->loadTemplate('links'); ?>
  <?php endif; ?>
  <?php // Optional teaser intro text for guests ?>
  <?php elseif ($params->get('show_noauth') == true && $user->get('guest')) : ?>
  <?php echo JLayoutHelper::render('joomla.content.intro_image', $this->item); ?>
  <?php echo JHtml::_('content.prepare', $this->item->introtext); ?>
  <?php // Optional link to let them register to see the whole article. ?>
  <?php if ($params->get('show_readmore') && $this->item->fulltext != null) : ?>
  <?php $menu = JFactory::getApplication()->getMenu(); ?>
  <?php $active = $menu->getActive(); ?>
  <?php $itemId = $active->id; ?>
  <?php $link = new JUri(JRoute::_('index.php?option=com_users&view=login&Itemid=' . $itemId, false)); ?>
  <?php $link->setVar('return', base64_encode(ContentHelperRoute::getArticleRoute($this->item->slug, $this->item->catid, $this->item->language))); ?>
  <p class="readmore">
    <a href="<?php echo $link; ?>" class="register">
    <?php $attribs = json_decode($this->item->attribs); ?>
    <?php
    if ($attribs->alternative_readmore == null) :
      echo JText::_('COM_CONTENT_REGISTER_TO_READ_MORE');
    elseif ($readmore = $attribs->alternative_readmore) :
      echo $readmore;
      if ($params->get('show_readmore_title', 0) != 0) :
        echo JHtml::_('string.truncate', $this->item->title, $params->get('readmore_limit'));
      endif;
    elseif ($params->get('show_readmore_title', 0) == 0) :
      echo JText::sprintf('COM_CONTENT_READ_MORE_TITLE');
    else :
      echo JText::_('COM_CONTENT_READ_MORE');
      echo JHtml::_('string.truncate', $this->item->title, $params->get('readmore_limit'));
    endif; ?>
    </a>
  </p>
  <?php endif; ?>
  <?php endif; ?>
  <?php
  if (!empty($this->item->pagination) && $this->item->pagination && $this->item->paginationposition && $this->item->paginationrelative) :
    echo $this->item->pagination;
  ?>
  <?php endif; ?>
  <?php // Content is generated by content plugin event "onContentAfterDisplay" ?>
  <?php echo $this->item->event->afterDisplayContent; ?>
</div>

page
What to remove to put another head, another menu?

Answer 1

<?php echo "123"; ?>
Paste in the code section and determine by the method of scientific poking what and where it comes from. But according to the screen of the page, this piece is not here at all

<div class="item-page<?php echo $this->pageclass_sfx; ?>" itemscope itemtype="https://schema.org/Article">
  <meta itemprop="inLanguage" content="<?php echo ($this->item->language === '*') ? JFactory::getConfig()->get('language') : $this->item->language; ?>" />
  <?php if ($this->params->get('show_page_heading')) : ?>
  <div class="page-header">
    <h1> <?php echo $this->escape($this->params->get('page_heading')); ?> </h1>
  </div>
  <?php endif;
  if (!empty($this->item->pagination) && $this->item->pagination && !$this->item->paginationposition && $this->item->paginationrelative)
  {
    echo $this->item->pagination;
  }
  ?>

  <?php // Todo Not that elegant would be nice to group the params ?>
  <?php $useDefList = ($params->get('show_modify_date') || $params->get('show_publish_date') || $params->get('show_create_date')
  || $params->get('show_hits') || $params->get('show_category') || $params->get('show_parent_category') || $params->get('show_author') || $assocParam); ?>

  <?php if (!$useDefList && $this->print) : ?>
    <div id="pop-print" class="btn hidden-print">
      <?php echo JHtml::_('icon.print_screen', $this->item, $params); ?>
    </div>
    <div class="clearfix"> </div>
  <?php endif; ?>