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<?php
add_action( 'wp_enqueue_scripts', 'parallax_enqueue_scripts' );
/**
 * Enqueue Scripts
 */
function parallax_enqueue_scripts() {

	if ( is_active_sidebar( 'home-section-1' ) ) {

		if ( ! wp_is_mobile() ) {

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<div class="container">
  <ul>
    <li>block 1</li>
    <li>block 2</li>
    <li>block 3</li>
    <li>block 4</li>
    <li>block 5</li>
    <li>block 6</li>
    <li>block 7</li>
    <li>block 8</li>

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https://www.virendrachandak.com/techtalk/php-isset-vs-empty-vs-is_null/
http://www.zomeoff.com/php-fast-way-to-determine-a-key-elements-existance-in-an-array/

isset

• This will check to see if there is a value for an item in an array.
• This will return true if the value is set to ''.
• This will return false if the value is set to null.

$people = array(

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<?php

// source: https://paulund.co.uk/list-pages-using-page-template

$args = array(
	'post_type'  => 'page',
	'meta_key'   => '_wp_page_template',
	'meta_value' => 'template-two-column-page.php', // the template you want to check
);

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Information

This exploded into a big discussion about the creation of template tags and why you don’t have to always create a get and a do.

Example, in a loop you run do_my_thing(), the function do_my_thing() does not need to buffer the output if you’re just going to echo it out in the loop, so ob_start is not needed!

If, later, you find you need to get that string you can write a simple getter: https://gist.github.com/cd948f2b9f83625e09518c531d272d1c#file-output-buffering-example-php

Usually a template tag is wrote as a do first, and then a get later when it’s needed, but either way write your do and get when you need them, don’t build a get for the future unless it will be needed in the future