Fix deprecated dynamic property creation and week calculation in relativeTime function
- Resolved deprecated warning by avoiding dynamic property creation on DateInterval object.
- Calculated weeks separately and included them correctly in the output string.
- Adjusted the logic to handle weeks within the string array without creating a dynamic property.
- Ensured compatibility with PHP 8.2 and higher, where dynamic properties are deprecated.
This fix prevents the "Deprecated: Creation of dynamic property DateInterval::$w is deprecated" warning and correctly formats the relative time string.
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