PHP - Function Handling

The call_user_func() function can call a user function given by first parameter.

The call_user_func_array() function call a user function given with an array of parameters.

The create_function() function is an inbuilt function that can be used to create an anonymous (lambda-style) function.

The forward_static_call() function can call a static method.

The forward_static_call_array() function can call a static method and pass the arguments as an array.

The func_get_arg() function can return an item from an argument list.

The func_get_args() function can return an array comprising a function's argument list.

The func_num_args() function can return the number of arguments passed to a function.

The function_exists() function can return true if a given function has been defined.

The get_defined_functions() function can return an array of all defined functions.

The register_shutdown_function() function can register a function for execution on shutdown.

The register_tick_function() function can register a function for execution on each tick.

The unregister_tick_function() function can de-register a function for execution on each tick.