Address implicit nullable parameter deprecation #163
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Implicit nullable parameter declarations are deprecated in PHP 8.4, so the following output appears when using SimpleXLSX with PHP 8.4: `Deprecated: Shuchkin\SimpleXLSXEx::getColorValue(): Implicitly marking parameter $a as nullable is deprecated, the explicit nullable type must be used instead in src/SimpleXLSXEx.php on line 614` This updates the type of the `getColorValue` function's `$a` parameter to be explicitly nullable.
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Implicit nullable parameter declarations are deprecated in PHP 8.4, so the following output appears when using SimpleXLSX with PHP 8.4:
Deprecated: Shuchkin\SimpleXLSXEx::getColorValue(): Implicitly marking parameter $a as nullable is deprecated, the explicit nullable type must be used instead in src/SimpleXLSXEx.php on line 614This updates the type of the
getColorValuefunction's$aparameter to beexplicitly nullable.
It's worth noting that nullable type declarations were introduced in PHP 7.1, so this is only a solution if your PHP target is at or above 7.1. [For what it's worth, PHP 7.1 has been unsupported (EOL) since 2019-12-01.]