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<?php interface I {} class C implements I {} class D {} var_dump((new C) instanceof I); var_dump((new D) instanceof I); var_dump(is_a(new C, 'I')); var_dump(is_a(new D, 'I'));
Output for 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.38, 7.0.0 - 7.0.32, 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 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
bool(true) bool(false) bool(true) bool(false)
Output for 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17
bool(true) bool(false) Strict Standards: is_a(): Deprecated. Please use the instanceof operator in /in/kR6cN on line 10 bool(true) Strict Standards: is_a(): Deprecated. Please use the instanceof operator in /in/kR6cN on line 11 bool(false)
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_STRING in /in/kR6cN on line 3
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/kR6cN on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/kR6cN on line 3
Process exited with code 255.

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