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<?php interface I {} class A {} class B {} class C extends A implements I {} var_dump(is_a('C', 'C', true), is_a('C', 'I', true), is_a('C', 'A', true), is_a('C', 'B', true));
Output for 5.3.9 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.8 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.25, 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 - 8.1.31, 8.2.0 - 8.2.27, 8.3.0 - 8.3.15, 8.4.1 - 8.4.2
bool(true) bool(true) bool(true) bool(false)
Output for 5.3.0 - 5.3.8
Warning: is_a() expects exactly 2 parameters, 3 given in /in/pGBkf on line 8 Warning: is_a() expects exactly 2 parameters, 3 given in /in/pGBkf on line 8 Warning: is_a() expects exactly 2 parameters, 3 given in /in/pGBkf on line 8 Warning: is_a() expects exactly 2 parameters, 3 given in /in/pGBkf on line 8 NULL NULL NULL NULL
Output for 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17
Strict Standards: is_a(): Deprecated. Please use the instanceof operator in /in/pGBkf on line 8 Warning: Wrong parameter count for is_a() in /in/pGBkf on line 8 Strict Standards: is_a(): Deprecated. Please use the instanceof operator in /in/pGBkf on line 8 Warning: Wrong parameter count for is_a() in /in/pGBkf on line 8 Strict Standards: is_a(): Deprecated. Please use the instanceof operator in /in/pGBkf on line 8 Warning: Wrong parameter count for is_a() in /in/pGBkf on line 8 Strict Standards: is_a(): Deprecated. Please use the instanceof operator in /in/pGBkf on line 8 Warning: Wrong parameter count for is_a() in /in/pGBkf on line 8 NULL NULL NULL NULL
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_STRING in /in/pGBkf 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/pGBkf on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/pGBkf on line 3
Process exited with code 255.
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