count generate waring in PHP 7 if there array is null

[yourchoice]

Warning: count(): Parameter must be an array or an object that implements Countable in ....

{$c = $var|count}

[tchalvak]

This is related to the php 7.x changes themselves, where count() can no longer be passed nulls. Unfortunately the only workaround that I am aware of is to also add a !empty($var) as well, or ensure the var is always countable, even if it is an empty array. Not sure if that will work for your situation.

[uwetews]

count() has been changed with PHP 7.2. See http://php.net/manual/en/migration72.incompatible.php
It does only accept arrays or objects that implement Countable.
For that reason the |count modifier fails if the variable is unassigned or has a value of NULL.

The workaround is

{$c = $var|default:array()|count}