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run code in 300+ PHP versions simultaneously
<?php class Foo implements ArrayAccess { public function offsetGet(mixed $offset) { } public function offsetExists(mixed $offset) { } public function offsetSet(mixed $offset, mixed $value) { } public function offsetUnset(mixed $offset) { } } class Foo81 implements ArrayAccess { #[\ReturnTypeWillChange] public function offsetGet(mixed $offset) { } #[\ReturnTypeWillChange] public function offsetExists(mixed $offset) { } #[\ReturnTypeWillChange] public function offsetSet(mixed $offset, mixed $value) { } #[\ReturnTypeWillChange] public function offsetUnset(mixed $offset) { } } class Foo81ForReal implements ArrayAccess { public function offsetGet(mixed $offset): string { } public function offsetExists(mixed $offset): bool { } public function offsetSet(mixed $offset, mixed $value): void { } public function offsetUnset(mixed $offset): void { } }
Output for 8.1.0 - 8.1.7
Deprecated: Return type of Foo::offsetExists(mixed $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/dd5Lp on line 8 Deprecated: Return type of Foo::offsetGet(mixed $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/dd5Lp on line 4 Deprecated: Return type of Foo::offsetSet(mixed $offset, mixed $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/dd5Lp on line 12 Deprecated: Return type of Foo::offsetUnset(mixed $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/dd5Lp on line 16
Output for 8.0.1 - 8.0.20
Output for 7.4.0 - 7.4.30
Fatal error: Declaration of Foo::offsetExists(mixed $offset) must be compatible with ArrayAccess::offsetExists($offset) in /in/dd5Lp on line 8
Process exited with code 255.

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