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<?php interface Foo { public function bar(?string $baz = null); } class Fooo implements Foo { public function bar(string $baz = null) { return $baz; } } class Barz extends Fooo { public function bar(?string $baz = null) { return var_export($baz, true); } } $foo = new Fooo(); $bar = new Barz(); var_dump($foo->bar(), $bar->bar());
Output for 8.4.1 - 8.4.23, 8.5.0 - 8.5.8
Deprecated: Fooo::bar(): Implicitly marking parameter $baz as nullable is deprecated, the explicit nullable type must be used instead in /in/CiQth on line 10 NULL string(4) "NULL"
Output for 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.32, 8.3.0 - 8.3.4, 8.3.6 - 8.3.32
NULL string(4) "NULL"
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 NULL string(4) "NULL"
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