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<?php interface I { } class A implements I { } class B extends A { } $b = new B(); echo "B <-> I:\n"; var_dump($b instanceof I); var_dump(is_a($b, "I")); var_dump(is_subclass_of($b, "I")); $rc = new ReflectionClass("B"); var_dump($rc->getInterfaceNames()); echo "\n\nB <-> A:\n"; var_dump($b instanceof A); var_dump(is_a($b, "A")); var_dump(is_subclass_of($b, "A"));
Output for 5.6.38, 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, 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
B <-> I: bool(true) bool(true) bool(true) array(1) { [0]=> string(1) "I" } B <-> A: bool(true) bool(true) bool(true)
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 B <-> I: bool(true) bool(true) bool(true) array(1) { [0]=> string(1) "I" } B <-> A: bool(true) bool(true) bool(true)
preferences:
214.94 ms | 402 KiB | 245 Q