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<?php // An example callback function function my_callback_function() { echo 'hello world!', PHP_EOL; } // Callback methods in classes class ParentClass { static function myCallbackMethod() { echo 'Hello Parent!', PHP_EOL; } } class MyClass extends ParentClass { static function myCallbackMethod() { echo 'Hello Child!', PHP_EOL; } } class Invokable { public function __invoke() { echo 'Hello Invokable', PHP_EOL; } } $obj = new MyClass(); $invokable = new Invokable(); $callbacks = array( 'type1' => 'my_callback_function', 'type2' => array('MyClass', 'myCallbackMethod'), 'type3' => array($obj, 'myCallbackMethod'), 'type6' => $invokable, 'type7' => function() { echo 'Hello Closure', PHP_EOL; }, 'type4' => 'MyClass::myCallbackMethod', 'type5' => array('MyClass', 'parent::myCallbackMethod'), ); foreach( $callbacks as $key => $callback ) { echo PHP_EOL, 'Testing ', $key, PHP_EOL; var_dump(is_callable()); call_user_func($callback); try { $callback(); } catch( Error $e ) { echo $e->getMessage(), PHP_EOL; } }
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6
Testing type1 Fatal error: Uncaught ArgumentCountError: is_callable() expects at least 1 argument, 0 given in /in/CrEev:42 Stack trace: #0 /in/CrEev(42): is_callable() #1 {main} thrown in /in/CrEev on line 42
Process exited with code 255.
Output for 8.3.5
Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 Testing type1 Fatal error: Uncaught ArgumentCountError: is_callable() expects at least 1 argument, 0 given in /in/CrEev:42 Stack trace: #0 /in/CrEev(42): is_callable() #1 {main} thrown in /in/CrEev on line 42
Process exited with code 255.
Output for 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
Testing type1 Warning: is_callable() expects at least 1 parameter, 0 given in /in/CrEev on line 42 NULL hello world! hello world! Testing type2 Warning: is_callable() expects at least 1 parameter, 0 given in /in/CrEev on line 42 NULL Hello Child! Hello Child! Testing type3 Warning: is_callable() expects at least 1 parameter, 0 given in /in/CrEev on line 42 NULL Hello Child! Hello Child! Testing type6 Warning: is_callable() expects at least 1 parameter, 0 given in /in/CrEev on line 42 NULL Hello Invokable Hello Invokable Testing type7 Warning: is_callable() expects at least 1 parameter, 0 given in /in/CrEev on line 42 NULL Hello Closure Hello Closure Testing type4 Warning: is_callable() expects at least 1 parameter, 0 given in /in/CrEev on line 42 NULL Hello Child! Hello Child! Testing type5 Warning: is_callable() expects at least 1 parameter, 0 given in /in/CrEev on line 42 NULL Hello Parent! Call to undefined method MyClass::parent::myCallbackMethod()
Output for 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40
Testing type1 Warning: is_callable() expects at least 1 parameter, 0 given in /in/CrEev on line 42 NULL hello world! hello world! Testing type2 Warning: is_callable() expects at least 1 parameter, 0 given in /in/CrEev on line 42 NULL Hello Child! Hello Child! Testing type3 Warning: is_callable() expects at least 1 parameter, 0 given in /in/CrEev on line 42 NULL Hello Child! Hello Child! Testing type6 Warning: is_callable() expects at least 1 parameter, 0 given in /in/CrEev on line 42 NULL Hello Invokable Hello Invokable Testing type7 Warning: is_callable() expects at least 1 parameter, 0 given in /in/CrEev on line 42 NULL Hello Closure Hello Closure Testing type4 Warning: is_callable() expects at least 1 parameter, 0 given in /in/CrEev on line 42 NULL Hello Child! Fatal error: Call to undefined function MyClass::myCallbackMethod() in /in/CrEev on line 45
Process exited with code 255.
Output for 5.3.0 - 5.3.29
Testing type1 Warning: is_callable() expects at least 1 parameter, 0 given in /in/CrEev on line 42 NULL hello world! hello world! Testing type2 Warning: is_callable() expects at least 1 parameter, 0 given in /in/CrEev on line 42 NULL Hello Child! Fatal error: Function name must be a string in /in/CrEev on line 45
Process exited with code 255.
Output for 5.1.0 - 5.1.6, 5.2.0 - 5.2.17
Parse error: syntax error, unexpected T_FUNCTION in /in/CrEev on line 35
Process exited with code 255.
Output for 5.0.0 - 5.0.5
Parse error: parse error, unexpected T_FUNCTION in /in/CrEev on line 35
Process exited with code 255.
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_STATIC, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/CrEev on line 10
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_STATIC, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/CrEev on line 10
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/CrEev on line 10
Process exited with code 255.
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