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<?php interface Thing { } class Foo implements Thing { } class Bar extends Foo { } class Zulu { } var_dump( is_subclass_of('Foo', 'Thing'), is_a('Foo', 'Thing', TRUE), is_subclass_of('Bar', 'Thing'), is_a('Bar', 'Thing', TRUE), is_subclass_of('Zulu', 'Thing'), is_a('Zulu', 'Thing', TRUE), is_subclass_of('Foo', 'Foo'), is_a('Foo', 'Foo', TRUE) );
Output for 5.3.9 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.7 - 5.6.21, 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 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
bool(true) bool(true) bool(true) bool(true) bool(false) bool(false) bool(false) bool(true)
Output for 5.3.7 - 5.3.8
Warning: is_a() expects exactly 2 parameters, 3 given in /in/6N7UM on line 13 Warning: is_a() expects exactly 2 parameters, 3 given in /in/6N7UM on line 15 Warning: is_a() expects exactly 2 parameters, 3 given in /in/6N7UM on line 17 Warning: is_a() expects exactly 2 parameters, 3 given in /in/6N7UM on line 19 bool(true) NULL bool(true) NULL bool(false) NULL bool(false) NULL
Output for 5.3.0 - 5.3.6
Warning: is_a() expects exactly 2 parameters, 3 given in /in/6N7UM on line 13 Warning: is_a() expects exactly 2 parameters, 3 given in /in/6N7UM on line 15 Warning: is_a() expects exactly 2 parameters, 3 given in /in/6N7UM on line 17 Warning: is_a() expects exactly 2 parameters, 3 given in /in/6N7UM on line 19 bool(false) NULL bool(true) NULL bool(false) NULL bool(false) NULL
Output for 5.0.3 - 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/6N7UM on line 13 Warning: Wrong parameter count for is_a() in /in/6N7UM on line 13 Strict Standards: is_a(): Deprecated. Please use the instanceof operator in /in/6N7UM on line 15 Warning: Wrong parameter count for is_a() in /in/6N7UM on line 15 Strict Standards: is_a(): Deprecated. Please use the instanceof operator in /in/6N7UM on line 17 Warning: Wrong parameter count for is_a() in /in/6N7UM on line 17 Strict Standards: is_a(): Deprecated. Please use the instanceof operator in /in/6N7UM on line 19 Warning: Wrong parameter count for is_a() in /in/6N7UM on line 19 bool(false) NULL bool(true) NULL bool(false) NULL bool(false) NULL
Output for 5.0.0 - 5.0.2
Strict Standards: is_a(): Deprecated. Please use the instanceof operator in /in/6N7UM on line 13 Warning: Wrong parameter count for is_a() in /in/6N7UM on line 13 Strict Standards: is_a(): Deprecated. Please use the instanceof operator in /in/6N7UM on line 15 Warning: Wrong parameter count for is_a() in /in/6N7UM on line 15 Strict Standards: is_a(): Deprecated. Please use the instanceof operator in /in/6N7UM on line 17 Warning: Wrong parameter count for is_a() in /in/6N7UM on line 17 Strict Standards: is_a(): Deprecated. Please use the instanceof operator in /in/6N7UM on line 19 Warning: Wrong parameter count for is_a() in /in/6N7UM on line 19 bool(false) NULL bool(false) NULL bool(false) NULL bool(false) NULL
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_STRING in /in/6N7UM on line 2
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/6N7UM on line 2
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/6N7UM on line 2
Process exited with code 255.
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