How to include a PHP file inside WordPress php template?

itemprop="text">

This is the code I have inside
php tags:

include('/wp-content/custom-php/numberedSteps.php');
            

And I get
this error:

Warning: include(/wp-content/custom-php/numberedSteps.php): failed to open
stream:

No such file or directory in
/home/user/public_html/website.com/wp-content/themes/flatsome/woocommerce/archive-product.php
on line 85

Warning: include(): Failed opening
'/wp-content/custom-php/numberedSteps.php' for inclusion
(include_path='.:/usr/local/php56/pear') in
/home/user/public_html/website.com/wp-content/themes/flatsome/woocommerce/archive-product.php
on line
85

How
can this error be fixed?

itemprop="text">

class="normal">Answer

try
getting the root path first

for PHP >= 5.3.0
try

include(__DIR__.'/wp-content/custom-php/numberedSteps.php');

For
PHP < 5.3.0
try

include(dirname(__FILE__).'/wp-content/custom-php/numberedSteps.php');