1standalone null, false and true types
2-----
3<?php
4
5function test(): null {}
6function test(): false {}
7function test(): true {}
8-----
9!!version=8.1
10array(
11    0: Stmt_Function(
12        attrGroups: array(
13        )
14        byRef: false
15        name: Identifier(
16            name: test
17        )
18        params: array(
19        )
20        returnType: Identifier(
21            name: null
22        )
23        stmts: array(
24        )
25    )
26    1: Stmt_Function(
27        attrGroups: array(
28        )
29        byRef: false
30        name: Identifier(
31            name: test
32        )
33        params: array(
34        )
35        returnType: Identifier(
36            name: false
37        )
38        stmts: array(
39        )
40    )
41    2: Stmt_Function(
42        attrGroups: array(
43        )
44        byRef: false
45        name: Identifier(
46            name: test
47        )
48        params: array(
49        )
50        returnType: Name(
51            name: true
52        )
53        stmts: array(
54        )
55    )
56)
57-----
58<?php
59
60function test(): null {}
61function test(): false {}
62function test(): true {}
63-----
64!!version=8.2
65array(
66    0: Stmt_Function(
67        attrGroups: array(
68        )
69        byRef: false
70        name: Identifier(
71            name: test
72        )
73        params: array(
74        )
75        returnType: Identifier(
76            name: null
77        )
78        stmts: array(
79        )
80    )
81    1: Stmt_Function(
82        attrGroups: array(
83        )
84        byRef: false
85        name: Identifier(
86            name: test
87        )
88        params: array(
89        )
90        returnType: Identifier(
91            name: false
92        )
93        stmts: array(
94        )
95    )
96    2: Stmt_Function(
97        attrGroups: array(
98        )
99        byRef: false
100        name: Identifier(
101            name: test
102        )
103        params: array(
104        )
105        returnType: Identifier(
106            name: true
107        )
108        stmts: array(
109        )
110    )
111)
112