3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?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));
Output for 5.3.9 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
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/uGVt8 on line 14 NULL Warning: is_a() expects exactly 2 parameters, 3 given in /in/uGVt8 on line 15 NULL Warning: is_a() expects exactly 2 parameters, 3 given in /in/uGVt8 on line 16 NULL
Output for 5.0.0 - 5.2.17
Strict Standards: is_a(): Deprecated. Please use the instanceof operator in /in/uGVt8 on line 8 bool(true) Strict Standards: is_a(): Deprecated. Please use the instanceof operator in /in/uGVt8 on line 11 bool(true) Strict Standards: is_a(): Deprecated. Please use the instanceof operator in /in/uGVt8 on line 12 bool(true) Strict Standards: is_a(): Deprecated. Please use the instanceof operator in /in/uGVt8 on line 13 bool(true) Strict Standards: is_a(): Deprecated. Please use the instanceof operator in /in/uGVt8 on line 14 Warning: Wrong parameter count for is_a() in /in/uGVt8 on line 14 NULL Strict Standards: is_a(): Deprecated. Please use the instanceof operator in /in/uGVt8 on line 15 Warning: Wrong parameter count for is_a() in /in/uGVt8 on line 15 NULL Strict Standards: is_a(): Deprecated. Please use the instanceof operator in /in/uGVt8 on line 16 Warning: Wrong parameter count for is_a() in /in/uGVt8 on line 16 NULL
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_STRING in /in/uGVt8 on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1
Parse error: parse error, unexpected T_STRING in /in/uGVt8 on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/uGVt8 on line 3
Process exited with code 255.