Supported Versions: PHP 4 >= 4.0.4, PHP 5, PHP 7, PHP 8
Finds whether a variable is null
<?php is_null(mixed $value): bool
<?php         $themeSpacer = self::$theme->getVariables()->get('spacer', 1);



        if (is_null($right) && is_null($bottom) && is_null($left)) {

            $right  = $top;

            $bottom = $top;

            $left   = $top;
<?php         $themeSpacer = self::$theme->getVariables()->get('spacer', 1);



        if (is_null($right) && is_null($bottom) && is_null($left)) {

            $right  = $top;

            $bottom = $top;

            $left   = $top;