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<?php interface SerializableInterface {} interface SomeResizableInterface {} interface IterableInterface {} trait SomeSerializableTrait {} trait SomeOtherSerializableTrait {} class SomeContainer implements SerializableInterface, IterableInterface { use SomeSerializableTrait; } class SomeOtherContainer extends SomeContainer implements SomeResizableInterface { use SomeOtherSerializableTrait; } $someContainer = new SomeContainer; $someOtherContainer = new SomeOtherContainer; var_dump($someContainer instanceof SerializableInterface); var_dump($someOtherContainer instanceof SerializableInterface); var_dump($someOtherContainer instanceof SomeSerializableTrait); var_dump($someOtherContainer instanceof SomeOtherSerializableTrait); // type hint it function testTrait(SomeSerializableTrait $container) {} function testOtherTrait(SomeOtherSerializableTrait $container) {} function testInterface(SomeResizableInterface $container) {} try {testInterface($someOtherContainer);} catch(Exception $e) {var_dump($e);} try {testOtherTrait($someOtherContainer);} catch(Exception $e) {var_dump($e);} try {testTrait($someOtherContainer);} catch(Exception $e) {var_dump($e);}
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6
bool(true) bool(true) bool(false) bool(false) Fatal error: Uncaught TypeError: testOtherTrait(): Argument #1 ($container) must be of type SomeOtherSerializableTrait, SomeOtherContainer given, called in /in/u0Bjs on line 32 and defined in /in/u0Bjs:28 Stack trace: #0 /in/u0Bjs(32): testOtherTrait(Object(SomeOtherContainer)) #1 {main} thrown in /in/u0Bjs on line 28
Process exited with code 255.
Output for 8.3.5
Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 bool(true) bool(true) bool(false) bool(false) Fatal error: Uncaught TypeError: testOtherTrait(): Argument #1 ($container) must be of type SomeOtherSerializableTrait, SomeOtherContainer given, called in /in/u0Bjs on line 32 and defined in /in/u0Bjs:28 Stack trace: #0 /in/u0Bjs(32): testOtherTrait(Object(SomeOtherContainer)) #1 {main} thrown in /in/u0Bjs on line 28
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
bool(true) bool(true) bool(false) bool(false) Fatal error: Uncaught TypeError: Argument 1 passed to testOtherTrait() must be an instance of SomeOtherSerializableTrait, instance of SomeOtherContainer given, called in /in/u0Bjs on line 32 and defined in /in/u0Bjs:28 Stack trace: #0 /in/u0Bjs(32): testOtherTrait(Object(SomeOtherContainer)) #1 {main} thrown in /in/u0Bjs on line 28
Process exited with code 255.
Output for 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40
bool(true) bool(true) bool(false) bool(false) Catchable fatal error: Argument 1 passed to testOtherTrait() must be an instance of SomeOtherSerializableTrait, instance of SomeOtherContainer given, called in /in/u0Bjs on line 32 and defined in /in/u0Bjs on line 28
Process exited with code 255.
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