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<?php class A { protected function get() { return 'A'; } } class B1 extends A {} class B2 extends A { protected function get() { return 'A'; } } class C extends A { public function foo(A $a) { echo $a->get(); // will fail depends on $a implementation // liskov substitution principle failed } } $a = new A(); $b1 = new B1(); $b2 = new B2(); $c = new C(); $c->foo($b1); // ok $c->foo($b2); // ok
Output for 5.2.0 - 5.2.17, 5.3.0 - 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, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.26, 8.4.1 - 8.4.13
AA
Output for 5.0.0 - 5.0.5, 5.1.1 - 5.1.6
A Fatal error: Call to protected method B2::get() from context 'C' in /in/NSCKW on line 16
Process exited with code 255.
Output for 5.1.0
Fatal error: fatal flex scanner internal error--end of buffer missed in /in/NSCKW on line 25
Process exited with code 255.
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/NSCKW 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, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/NSCKW on line 4
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `T_OLD_FUNCTION' or `T_FUNCTION' or `T_VAR' or `'}'' in /in/NSCKW on line 4
Process exited with code 255.
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