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<?php class testClass { function testClass () { echo 'Output string!'; } } class testClass2 extends testClass { function __construct () { call_user_func(array('parent', '__construct')); } } new testClass2;
Output for 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Deprecated: Use of "parent" in callables is deprecated in /in/P4mXD on line 14 Fatal error: Uncaught TypeError: call_user_func(): Argument #1 ($callback) must be a valid callback, class testClass does not have a method "__construct" in /in/P4mXD:14 Stack trace: #0 /in/P4mXD(18): testClass2->__construct() #1 {main} thrown in /in/P4mXD on line 14
Process exited with code 255.
Output for 8.0.10 - 8.0.30, 8.1.0 - 8.1.28
Fatal error: Uncaught TypeError: call_user_func(): Argument #1 ($callback) must be a valid callback, class testClass does not have a method "__construct" in /in/P4mXD:14 Stack trace: #0 /in/P4mXD(18): testClass2->__construct() #1 {main} thrown in /in/P4mXD on line 14
Process exited with code 255.
Output for 8.0.0 - 8.0.9
Fatal error: Uncaught TypeError: call_user_func(): Argument #1 ($function) must be a valid callback, class testClass does not have a method "__construct" in /in/P4mXD:14 Stack trace: #0 /in/P4mXD(18): testClass2->__construct() #1 {main} thrown in /in/P4mXD on line 14
Process exited with code 255.
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.12 - 7.3.31, 7.4.0 - 7.4.25, 7.4.27 - 7.4.33
Deprecated: Methods with the same name as their class will not be constructors in a future version of PHP; testClass has a deprecated constructor in /in/P4mXD on line 2 Output string!
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.3.2 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.36, 5.6.0 - 5.6.28, 7.3.32 - 7.3.33, 7.4.26
Output string!
Output for 5.3.0 - 5.3.1

Process exited with code 139.
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
Warning: call_user_func(parent::__construct): First argument is expected to be a valid callback in /in/P4mXD on line 14
Output for 5.1.2
Strict Standards: Non-static method testClass::__construct() cannot be called statically, assuming $this from compatible context testClass2 in /in/P4mXD on line 14 Warning: call_user_func(parent::__construct): First argument is expected to be a valid callback in /in/P4mXD on line 14

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