Check for condition in page template

I am now using fe_page template for my page. I need to check whether news module is used in that page or not. How can we check for that condition in page template? And in that condition I also need to check whether image exists for that news or not? How these conditions can be implemented in page template for meta tags?

I tried with html parsing for checking the div classes with mod_newslist. But it's not working. Is there any way to check this?

What do you like to accomplish. As I think fe_page template is the wrong place for that. Only change fe_page if it's necessary.

In every template you can check page credentials like so

PHP Code:

---

<?php
global $objPage;
echo $objPage->alias;
echo $objPage->(fieldname of table tl_page);
?>

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What do you mean with "meta tags"?

You can try to modify the page TITLE tag by

PHP Code:

---

<?php
global $objPage;
$objPage->title = 'my title';
?>

---

You can use a template to put HTML code into the HEAD section.

PHP Code:

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<?php
$GLOBALS['TL_HEAD'][] = '<meta name="property" content="value">';

// analyze $GLOBALS for other places like HEAD
?>

---

You can use such a template with a content element (CE) type HTML, a frontend (FE) module type HTML, a j_- or moo_-template (e.g. j_my-php-code) which you pick in page layout or by using the inserttag {{file::my-php-code.html5|php|inc|foo}}. This file has to be in folder templates/. Or use this code directly in your news template.

In templates you can output the template vars with

PHP Code:

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<?php
$this->showTemplateVars();
?>

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In news templates you can analyze the news with a NewsModel

PHP Code:

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<?php
print_r(\NewsModel::findByPk($this->id)); // Pk = primary key

// or
$myNewsModel = \NewsModel::findByPk($this->id);
echo $myNewsModel->headline;
?>

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Thanks for your reply. I will try to explain my case in detail.
I need to display meta tags in every page's head section. And I am using fe_page template in all pages. So I extended this page template and used this in all pages, so that I need to change the template only here, to get it reflected in all pages. Is this the correct method?
Secondly, I need to check a condition. That is,
1) If news module is used in that page and if it contains an image, then write the meta tag as "<meta name="twitter:card" content="summary_large_image">"
2) If news module is not used in that page, Then write the condition as <meta name="twitter:card" content="summary">
My question is, whether it is possible to check the conditions in fe_page template?
I tried with parseArticle hook, but the else condition doesn't work. Is there any method to check this condition?

This is hardly possible and thus not best practice.

Better:

Create a template "j_extended-head.html5" and include it in your page layout. Content:

PHP Code:

---

<?php
$GLOBALS['TL_HEAD'][] = '<meta name="foo" content="bar">'; 
$GLOBALS['TL_HEAD'][] = '<meta name="twitter:card" content="summary">';

---

I take it that your're talking bout the news reader module. So now put this into your reader template.

PHP Code:

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<?php

if($this->addImage) // addImage untested
{
  foreach($GLOBALS['TL_HEAD'] as $key => $value)
  {
    if(strpos($value, '"twitter:card"'))
    {
      unset($GLOBALS['TL_HEAD'][$key]);
    }
    break;
  }

  $GLOBALS['TL_HEAD'][] = '<meta name="twitter:card" content="summary_large_image">';
}

?>

---