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<?php interface ia { const c = 'Sea'; } class Foo implements ia { // const c = "Lake"; // Attempting to override ia's constant c in // this class triggers a fatal error. } class FooBar extends Foo implements ia { const c = 'Ocean'; // No error, class constant // overriding ia's definition. public function show(){ // ia's definition is still accessible. return ia::c; } public function showp(){ return parent::c; } } $i = new FooBar; echo FooBar::c; echo $i->show(); echo $i->showp();
Output for 5.2.0 - 5.2.11, 5.3.0 - 5.3.1, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
OceanSeaSea
Output for 5.2.12 - 5.2.17, 5.3.2 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30
Fatal error: Cannot inherit previously-inherited or override constant c from interface ia in /in/viqj7 on line 17
Process exited with code 255.
Output for 5.0.0 - 5.0.5, 5.1.0 - 5.1.6
Fatal error: Cannot inherit previously-inherited constant c from interface ia in /in/viqj7 on line 17
Process exited with code 255.
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_STRING in /in/viqj7 on line 4
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1
Parse error: parse error, unexpected T_STRING in /in/viqj7 on line 4
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/viqj7 on line 4
Process exited with code 255.
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255.49 ms | 401 KiB | 459 Q