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<?php class Foo { public function test($foo = null) {} } class Bar extends Foo { public function test() {} } $bar = new Bar; $bar->test();
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6
Fatal error: Declaration of Bar::test() must be compatible with Foo::test($foo = null) in /in/9VINs on line 7
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 Fatal error: Declaration of Bar::test() must be compatible with Foo::test($foo = null) in /in/9VINs on line 7
Process exited with code 255.
Output for 7.4.0 - 7.4.33
Warning: Declaration of Bar::test() should be compatible with Foo::test($foo = NULL) in /in/9VINs on line 7
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33
Warning: Declaration of Bar::test() should be compatible with Foo::test($foo = NULL) in /in/9VINs on line 8
Output for 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.8 - 5.6.21
Strict Standards: Declaration of Bar::test() should be compatible with Foo::test($foo = NULL) in /in/9VINs on line 8

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