new.dateTimeImmutable

Code example

<?php declare(strict_types = 1);

$date = new DateTimeImmutable('this is not a date');

Why is it reported?

The DateTimeImmutable constructor is being called with a date string that PHP cannot parse. When an invalid date string is passed, DateTimeImmutable::__construct() produces an error. PHPStan detects constant string arguments that will cause a parsing failure at runtime and reports them at analysis time.

How to fix it

Provide a valid date string:

 <?php declare(strict_types = 1);

-$date = new DateTimeImmutable('this is not a date');
+$date = new DateTimeImmutable('2024-01-15');

Or use DateTimeImmutable::createFromFormat() for predictable parsing of non-standard formats:

 <?php declare(strict_types = 1);

-$date = new DateTimeImmutable('this is not a date');
+$date = DateTimeImmutable::createFromFormat('Y/m/d', '2024/01/15');