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<?hh //strict interface IFoo { public function boo() :string; } trait TFoo { public function boo() :int { return 1; } } class Foo implements IFoo { use TFoo; } $f = new Foo(); print($f->boo());
Output for 5.3.0 - 5.3.29, 5.4.0 - 5.4.32, 7.2.29 - 7.2.33, 7.3.16 - 7.3.31, 7.4.3 - 7.4.32, 8.0.0 - 8.0.12, 8.0.14 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6
<?hh //strict interface IFoo { public function boo() :string; } trait TFoo { public function boo() :int { return 1; } } class Foo implements IFoo { use TFoo; } $f = new Foo(); print($f->boo());
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 <?hh //strict interface IFoo { public function boo() :string; } trait TFoo { public function boo() :int { return 1; } } class Foo implements IFoo { use TFoo; } $f = new Foo(); print($f->boo());
Output for 8.0.13
Parse error: syntax error, unexpected token "interface" in /in/dgVQo on line 3
Process exited with code 255.
Output for 7.3.32 - 7.3.33, 7.4.33
Parse error: syntax error, unexpected 'interface' (T_INTERFACE) in /in/dgVQo on line 3
Process exited with code 255.

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