3v4l.org

run code in 200+ php & hhvm versions
<?php interface A { function m(B $s): self; } class B implements A { function m(self $s): parent { return $this; } } class C extends B { function m(parent $s): A { return $this; } } $c = new C(); $r = $c->m($c); var_dump($r instanceof C);
Output for 7.2.0 - 7.2.11
Fatal error: Declaration of C::m(B $s): A must be compatible with B::m(B $s): parent in /in/Od72V on line 13
Process exited with code 255.
Output for 7.0.0 - 7.1.23
Fatal error: Declaration of C::m(B $s): A must be compatible with A::m(B $s): A in /in/Od72V on line 13
Process exited with code 255.
Output for hhvm-3.11.1 - 3.22.0
bool(true)
Output for hhvm-3.10.1
Fatal error: Syntax only allowed in Hack files (<?hh) or with -v Eval.EnableHipHopSyntax=true in /in/Od72V on line 4
Process exited with code 255.
Output for 5.1.0 - 5.6.38
Parse error: syntax error, unexpected ':', expecting ';' or '{' in /in/Od72V on line 4
Process exited with code 255.
Output for 5.0.0 - 5.0.5
Parse error: parse error, unexpected ':', expecting '{' or ';' in /in/Od72V on line 4
Process exited with code 255.
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_STRING in /in/Od72V on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1
Parse error: parse error, unexpected T_STRING in /in/Od72V on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/Od72V on line 3
Process exited with code 255.