Bug #78677 [Opn->Nab]: Interface declaration of ... unexpected behavior

Edit report at https://bugs.php.net/bug.php?id=78677&edit=1 ID: 78677 Updated by: cmb@php.net Reported by: pavel at bunaev dot ru Summary: Interface declaration of ... unexpected behavior -Status: Open +Status: Not a bug Type: Bug Package: *Programming Data Structures Operating System: 18.04.1-Ubuntu PHP Version: 7.2.23 -Assigned To: +Assigned To: cmb Block user comment: N Private report: N New Comment: Thank you for taking the time to write to us, but this is not a bug. Please double-check the documentation available at http://www.php.net/manual/ and the instructions on how to report a bug at http://bugs.php.net/how-to-report.php See <https://www.php.net/manual/en/migration72.new-features.php#migration72.new-features.param-type-widening>. Previous Comments: ------------------------------------------------------------------------ [2019-10-17 07:41:20] pavel at bunaev dot ru Description: ------------ The interface allows you to change the type of variable in an incompatible direction. In versions php 7.0+ and 7.1-, we could specify in the interface with what types of data we will work in the method. And at the kernel level, be sure that by implementing the interface the signature will not change. In version php 7.2+ and 7.3+, this has changed and there was no announcement .. We can create an interface and expect in the signature that the method will work with certain arguments but in fact we can transfer anything OS linux version php 7.2+ version php 7.1- is ok Test script: --------------- <?php interface IBaz {}; interface IFoo { public function simple(IBaz $a); } class CFoo implements IFoo { public function simple($a){ var_dump($a); } } $cFoo = new CFoo(); $cFoo->simple('vbvc'); Expected result: ---------------- <br /> <b>Fatal error</b>: Declaration of CFoo::simple($a) must be compatible with IFoo::simple(IBaz $a) in <b>[...][...]</b> on line <b>7</b><br /> Actual result: -------------- string(4) "vbvc" ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=78677&edit=1