The expression $this->idnFunctionExists of type boolean|null is loosely compared to false; this is ambiguous if the boolean can be false. You might want to explicitly use !== null instead.
If an expression can have both false, and null as possible values. It
is generally a good practice to always use strict comparison to clearly
distinguish between those two values.
$a=canBeFalseAndNull();// Instead ofif(!$a){}// Better use one of the explicit versions:if($a!==null){}if($a!==false){}if($a!==null&&$a!==false){}
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throw new RuntimeException('In order to use IDN validation intl extension must be installed and enabled.');
yiisoft /
validator
If an expression can have both
false, andnullas possible values. It is generally a good practice to always use strict comparison to clearly distinguish between those two values.