Improve error message class type

Refer to interfaces/enums instead of classes in more places.

Closes GH-7792

Author: iluuu1994

Zend/tests/class_alias_009.phpt

@@ -11,4 +11,4 @@ interface c extends a, b { }
 
 ?>
 --EXPECTF--
-Fatal error: Class c cannot implement previously implemented interface a in %s on line %d
+Fatal error: Interface c cannot implement previously implemented interface a in %s on line %d

Zend/tests/constants/final_constants/final_const12.phpt

@@ -19,4 +19,4 @@ interface I3 extends I1, I2
 
 ?>
 --EXPECTF--
-Fatal error: Class I3 inherits both I1::C and I2::C, which is ambiguous in %s on line %d
+Fatal error: Interface I3 inherits both I1::C and I2::C, which is ambiguous in %s on line %d

Zend/tests/enum/no-enum-implements-backed-enum.phpt

@@ -7,4 +7,4 @@ enum Foo: int implements BackedEnum {}
 
 ?>
 --EXPECTF--
-Fatal error: Class Foo cannot implement previously implemented interface BackedEnum in %s on line %d
+Fatal error: Enum Foo cannot implement previously implemented interface BackedEnum in %s on line %d

Zend/tests/enum/no-enum-implements-unit-enum.phpt

@@ -7,4 +7,4 @@ enum Foo implements UnitEnum {}
 
 ?>
 --EXPECTF--
-Fatal error: Class Foo cannot implement previously implemented interface UnitEnum in %s on line %d
+Fatal error: Enum Foo cannot implement previously implemented interface UnitEnum in %s on line %d

Zend/tests/gh7792_1.phpt

@@ -0,0 +1,14 @@
+--TEST--
+GH-7792 (Refer to enum as enum instead of class)
+--FILE--
+<?php
+
+interface A {
+    public function a(): void;
+}
+
+enum B implements A {}
+
+?>
+--EXPECTF--
+Fatal error: Enum B must implement 1 abstract private method (A::a) in %s on line %d

Zend/tests/gh7792_2.phpt

@@ -0,0 +1,10 @@
+--TEST--
+GH-7792 (Refer to enum as enum instead of class)
+--FILE--
+<?php
+
+enum Foo implements Throwable {}
+
+?>
+--EXPECTF--
+Fatal error: Enum Foo cannot implement interface Throwable in %s on line %d

Zend/tests/gh7792_3.phpt

@@ -0,0 +1,18 @@
+--TEST--
+GH-7792 (Refer to enum as enum instead of class)
+--FILE--
+<?php
+
+interface A {
+    const FOO = 'foo';
+}
+
+interface B {
+    const FOO = 'foo';
+}
+
+enum Foo implements A, B {}
+
+?>
+--EXPECTF--
+Fatal error: Enum Foo inherits both A::FOO and B::FOO, which is ambiguous in %s on line %d

Zend/tests/gh7792_4.phpt

@@ -0,0 +1,12 @@
+--TEST--
+GH-7792 (Refer to enum as enum instead of class)
+--FILE--
+<?php
+
+interface A {}
+
+enum Foo implements A, A {}
+
+?>
+--EXPECTF--
+Fatal error: Enum Foo cannot implement previously implemented interface A in %s on line %d

Zend/tests/gh7792_5.phpt

@@ -0,0 +1,10 @@
+--TEST--
+GH-7792 (Refer to enum as enum instead of class)
+--FILE--
+<?php
+
+enum Foo implements Traversable {}
+
+?>
+--EXPECT--
+Fatal error: Enum Foo must implement interface Traversable as part of either Iterator or IteratorAggregate in Unknown on line 0

Zend/tests/objects_014.phpt

@@ -12,4 +12,4 @@ interface bar extends foo, foo {
 echo "Done\n";
 ?>
 --EXPECTF--
-Fatal error: Class bar cannot implement previously implemented interface foo in %s on line %d
+Fatal error: Interface bar cannot implement previously implemented interface foo in %s on line %d