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For plain float type of variables or float being marked as string, there will be thrown a PHP Deprecation about potential data loss.
Read morePHP 8.1 – New Warning being throw when converting float to int
Format your date with local date structure to combine different format and pattern for full date via new class ` IntlDatePatternGenerator and methods like: getBestPattern() .
Combine two or more types of classes (or array) to be required by the class property, local variable or a return type of the function.
Here is a list of all deprecated functions and things in latest PHP 8.1.