Compatibility¶
Compatibility refers to the ability of two or more things to work together without conflicts or issues.
Compatibility may refer to:
Version compatibility, when code works in both versions
System compatibility, when code works on different operating systems
Method compatibility, when methods are compatible in the parent and the child class.
<?php
class X {
function foo(int $i) {}
}
class Y extends X {
// The type must be compatible with the one of the parent
// The name does not have to be the same as in the parent
function foo(int|null $b) {}
}
?>
Related : Method Compatibility, Interoperability, Migration
