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<?php class MyArrayAccess implements \ArrayAccess { public function offsetExists($offset) { } public function offsetSet($offset, $value) { } public function offsetGet($offset) { } public function offsetUnset($offset) { } } function test(array $arr) { } function test2(\ArrayAccess $arr) { } $arrObj = new MyArrayAccess(); test([]); //result: works! test($arrObj); //result: does NOT work test2([]); //result: does NOT work test2($arrObj); // result: works!
Output for 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.7
Deprecated: Return type of MyArrayAccess::offsetExists($offset) should either be compatible with ArrayAccess::offsetExists(mixed $offset): bool, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /in/KXthb on line 5 Deprecated: Return type of MyArrayAccess::offsetGet($offset) should either be compatible with ArrayAccess::offsetGet(mixed $offset): mixed, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /in/KXthb on line 15 Deprecated: Return type of MyArrayAccess::offsetSet($offset, $value) should either be compatible with ArrayAccess::offsetSet(mixed $offset, mixed $value): void, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /in/KXthb on line 10 Deprecated: Return type of MyArrayAccess::offsetUnset($offset) should either be compatible with ArrayAccess::offsetUnset(mixed $offset): void, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /in/KXthb on line 20 Fatal error: Uncaught TypeError: test(): Argument #1 ($arr) must be of type array, MyArrayAccess given, called in /in/KXthb on line 39 and defined in /in/KXthb:27 Stack trace: #0 /in/KXthb(39): test(Object(MyArrayAccess)) #1 {main} thrown in /in/KXthb on line 27
Process exited with code 255.
Output for 8.0.0 - 8.0.30
Fatal error: Uncaught TypeError: test(): Argument #1 ($arr) must be of type array, MyArrayAccess given, called in /in/KXthb on line 39 and defined in /in/KXthb:27 Stack trace: #0 /in/KXthb(39): test(Object(MyArrayAccess)) #1 {main} thrown in /in/KXthb on line 27
Process exited with code 255.
Output for 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
Fatal error: Uncaught TypeError: Argument 1 passed to test() must be of the type array, object given, called in /in/KXthb on line 39 and defined in /in/KXthb:27 Stack trace: #0 /in/KXthb(39): test(Object(MyArrayAccess)) #1 {main} thrown in /in/KXthb on line 27
Process exited with code 255.
Output for 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.32, 5.6.34 - 5.6.40
Catchable fatal error: Argument 1 passed to test() must be of the type array, object given, called in /in/KXthb on line 39 and defined in /in/KXthb on line 27
Process exited with code 255.
Output for 5.6.33

Process exited with code 137.
Output for 5.3.0 - 5.3.29
Parse error: syntax error, unexpected '[', expecting ')' in /in/KXthb on line 38
Process exited with code 255.
Output for 5.1.0 - 5.1.6, 5.2.0 - 5.2.17
Warning: Unexpected character in input: '\' (ASCII=92) state=1 in /in/KXthb on line 3 Warning: Unexpected character in input: '\' (ASCII=92) state=1 in /in/KXthb on line 31 Parse error: syntax error, unexpected '[', expecting ')' in /in/KXthb on line 38
Process exited with code 255.
Output for 5.0.0 - 5.0.5
Warning: Unexpected character in input: '\' (ASCII=92) state=1 in /in/KXthb on line 3 Parse error: parse error, unexpected T_ARRAY, expecting '&' or T_VARIABLE in /in/KXthb on line 27
Process exited with code 255.
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_STRING, expecting '{' in /in/KXthb on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1
Parse error: parse error, unexpected T_STRING, expecting '{' in /in/KXthb on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `'{'' in /in/KXthb on line 3
Process exited with code 255.
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