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<?php class A {} class B extends A{} class C extends B{} $b = 'B'; var_dump(is_subclass_of('A', 'A'), is_subclass_of('B', 'A'), is_subclass_of($b, 'A')); var_dump(is_a('A', 'A', true), is_a('B', 'A', true), is_a($b, 'A', true)); $className = 'C'; $parentClass = $className; while($_parentClass = get_parent_class($parentClass)) $parentClass = $_parentClass; var_dump($className, $parentClass);
Output for 5.3.9 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.36, 5.6.0 - 5.6.22, 7.0.0 - 7.0.20, 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(false) bool(true) bool(true) bool(true) bool(true) bool(true) string(1) "C" string(1) "A"
Output for 5.3.0 - 5.3.8
bool(false) bool(true) bool(true) Warning: is_a() expects exactly 2 parameters, 3 given in /in/GOgPp on line 9 Warning: is_a() expects exactly 2 parameters, 3 given in /in/GOgPp on line 9 Warning: is_a() expects exactly 2 parameters, 3 given in /in/GOgPp on line 9 NULL NULL NULL string(1) "C" string(1) "A"
Output for 5.0.3 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17
bool(false) bool(true) bool(true) Strict Standards: is_a(): Deprecated. Please use the instanceof operator in /in/GOgPp on line 9 Warning: Wrong parameter count for is_a() in /in/GOgPp on line 9 Strict Standards: is_a(): Deprecated. Please use the instanceof operator in /in/GOgPp on line 9 Warning: Wrong parameter count for is_a() in /in/GOgPp on line 9 Strict Standards: is_a(): Deprecated. Please use the instanceof operator in /in/GOgPp on line 9 Warning: Wrong parameter count for is_a() in /in/GOgPp on line 9 NULL NULL NULL string(1) "C" string(1) "A"
Output for 5.0.0 - 5.0.2
bool(false) bool(false) bool(false) Strict Standards: is_a(): Deprecated. Please use the instanceof operator in /in/GOgPp on line 9 Warning: Wrong parameter count for is_a() in /in/GOgPp on line 9 Strict Standards: is_a(): Deprecated. Please use the instanceof operator in /in/GOgPp on line 9 Warning: Wrong parameter count for is_a() in /in/GOgPp on line 9 Strict Standards: is_a(): Deprecated. Please use the instanceof operator in /in/GOgPp on line 9 Warning: Wrong parameter count for is_a() in /in/GOgPp on line 9 NULL NULL NULL string(1) "C" string(1) "A"
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9
bool(false) bool(false) bool(false) Warning: Wrong parameter count for is_a() in /in/GOgPp on line 9 Warning: Wrong parameter count for is_a() in /in/GOgPp on line 9 Warning: Wrong parameter count for is_a() in /in/GOgPp on line 9 NULL NULL NULL string(1) "C" string(1) "a"
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