Class foo cannot implement previously implemented interface i

Description

When a class implements an interface, that interface must only be cited once. In the example code, the same interface is mentionned several times, by simple repetition, by making it an absolute name, class_alias() or a local type alias.

The error doesn’t apply when the interface is implemented in the parent classes.

Example

<?php

use i as j;

interface i {}

// Multiple ways to reference an interface
class foo implements i, i, \i, j {}

?>

Solutions

• Remove the duplicate calls to the same interface.