PHP funkce is_callable()
Verify that the contents of a variable can be called as a function
|Parametr||Datový typ||Výchozí hodnota||Poznámka|
| || ||null,||If set to true the function only verifies that name might be a function or method. It will only reject simple variables that are not strings, or an array that does not have a valid structure to be used as a callback. The valid ones are supposed to have only 2 entries, the first of which is an object or a string, and the second a string.|
| || ||null||Receives the "callable name". In the example below it is "someClass::someMethod". Note, however, that despite the implication that someClass::SomeMethod() is a callable static method, this is not the case.|
true if name is callable, false otherwise.