This proposal will allow us to upgrade classes to use type hints in libraries without being required to update all subclasses. Since PHP 7.2, we are allowed to omit a type in a subclass without breaking any code. In PHP 7.0 this code produces the following warning: Warning: Declaration of M圜hildClass::myFunction($myarray) should be compatible with M圜lass::myFunction(array $myarray) in %s on line 8 Here we’ve omitted the parameter type in the subclass. Since PHP 7.2 type hints can be used with the object data type, and this improvement allows to declare a generic object as argument of a function or method. An incorrect data type would result in the following fatal error: Fatal error: Uncaught TypeError: Argument 1 passed to test() must be an instance of M圜lass, string given, called in /app/index.php on line 12 and defined in /app/index.php:8
In this code, the test function expects an instanceof M圜lass. If the given value is of an incorrect type, then PHP throws an error.Īrgument type declarations (also known as type hints) specify the type of a variable that is expected to be passed to a function or class method. Since PHP 5 we are allowed to specify in a function’s declaration the argument type that is expected to be passed. Core Improvements Argument type declarations You can see the full list of changes on the Requests For Comments page. Update: PHP 8.0 is now available to all Kinsta clients. See how Kinsta stacks up against the competition.
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