How to use if (is_page_template (''))

Question

i use the following code in my functions.php. I want to exclude all pages which use the single.php template.

function cat_menu() {

 if (!is_page_template('single.php')) {


$cur_cat = get_query_var('cat');

 $new_cats = wp_list_categories('echo=false&child_of=' . $cur_cat .'&depth=1&title_li=&&show_count=0&hide_empty=1');
            echo '<ul>' . $new_cats . '</ul>';
}}
  add_action ( 'genesis_after_header', 'cat_menu' ); 

But i see the result aslo on pages which use the single.php.

Can somebody help me with this?

Answer 1

is_page_template() checks against post type templates specified by the theme using

/**
 * Template Name: My Template
 */

at the top of the template file. Not any arbitrary template file. For this, you might wanna check out the answers over at Get name of the current template file. You could grab the code from the accepted answer there (get_current_template()) to do something when single.php === get_current_template().

Answer 2

You must to use the next function:

is_singular()

Is singular checks if current page is single.php.

Function reference

Answer 3

It's always strange to me how long it takes WPSE threads to receive accurate answers, here is a basic example of how to use it from StackOverflow:

// if not specific page template
<?php if (!is_page_template('page-templates/all-sponsor-template.php')); ?>
    // Stuff
<?php endif; ?>

// if is specific page template
<?php if (is_page_template('page-templates/all-sponsor-template.php')); ?>
    // Stuff
<?php endif; ?>

Ref: https://stackoverflow.com/questions/58531957/if-is-page-template-not-working-in-header-php

Answer 4

get_page_template_slug() - Returns only the page template

 global $post;    
    $template = get_page_template_slug($post->ID);         
    if ($template == 'page-template.php') {....}

Probably worth checking out easier

if(is_single()){....}