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<?php function test() { var_dump(debug_backtrace()); } class A { protected static function callTarget() { echo 'hello'; } } class B extends A { public function test() { call_user_func(array('parent', 'callTarget')); } } $a = new B; $a->test();
Output for 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Deprecated: Use of "parent" in callables is deprecated in /in/K0der on line 15 hello
Output for 5.0.0 - 5.0.5, 5.1.0 - 5.1.1, 5.1.3 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 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
hello
Output for 5.1.2
Strict Standards: Non-static method A::callTarget() cannot be called statically, assuming $this from compatible context B in /in/K0der on line 15 hello
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/K0der on line 8
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, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/K0der on line 8
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `T_OLD_FUNCTION' or `T_FUNCTION' or `T_VAR' or `'}'' in /in/K0der on line 8
Process exited with code 255.

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