3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php interface NewI {} class_alias('NewI', 'OldI'); class C1 implements NewI {} class C2 implements OldI {} function fn(NewI $i) { echo "New: Success!\n"; } function fo(OldI $i) { echo "Old: Success!\n"; } fn(new C1); fn(new C2); fo(new C1); fo(new C2);
based on 4dcmP
Output for 5.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
New: Success! New: Success! Old: Success! Old: Success!
Output for 5.0.0 - 5.2.17
Fatal error: Call to undefined function class_alias() in /in/VIMZs on line 3
Process exited with code 255.
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_STRING in /in/VIMZs on line 2
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/VIMZs on line 2
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/VIMZs on line 2
Process exited with code 255.