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<?php interface A {} class B implements A {} class C extends B {} $b = new B; var_dump(is_a($b, 'A')); $c = new C; var_dump(is_a($c, 'A')); var_dump(is_a($c, 'B')); var_dump(is_a($c, 'C')); var_dump(is_a('C', 'A', true)); var_dump(is_a('C', 'B', true)); var_dump(is_a('C', 'C', true)); var_dump(is_a('A', 'A', true));
Output for 5.3.9 - 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 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
bool(true) bool(true) bool(true) bool(true) bool(true) bool(true) bool(true) bool(true)
Output for 5.3.0 - 5.3.8
bool(true) bool(true) bool(true) bool(true) Warning: is_a() expects exactly 2 parameters, 3 given in /in/1aVcE on line 14 NULL Warning: is_a() expects exactly 2 parameters, 3 given in /in/1aVcE on line 15 NULL Warning: is_a() expects exactly 2 parameters, 3 given in /in/1aVcE on line 16 NULL Warning: is_a() expects exactly 2 parameters, 3 given in /in/1aVcE on line 18 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/1aVcE on line 8 bool(true) Strict Standards: is_a(): Deprecated. Please use the instanceof operator in /in/1aVcE on line 11 bool(true) Strict Standards: is_a(): Deprecated. Please use the instanceof operator in /in/1aVcE on line 12 bool(true) Strict Standards: is_a(): Deprecated. Please use the instanceof operator in /in/1aVcE on line 13 bool(true) Strict Standards: is_a(): Deprecated. Please use the instanceof operator in /in/1aVcE on line 14 Warning: Wrong parameter count for is_a() in /in/1aVcE on line 14 NULL Strict Standards: is_a(): Deprecated. Please use the instanceof operator in /in/1aVcE on line 15 Warning: Wrong parameter count for is_a() in /in/1aVcE on line 15 NULL Strict Standards: is_a(): Deprecated. Please use the instanceof operator in /in/1aVcE on line 16 Warning: Wrong parameter count for is_a() in /in/1aVcE on line 16 NULL Strict Standards: is_a(): Deprecated. Please use the instanceof operator in /in/1aVcE on line 18 Warning: Wrong parameter count for is_a() in /in/1aVcE on line 18 NULL
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_STRING in /in/1aVcE 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/1aVcE on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/1aVcE on line 3
Process exited with code 255.
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