codeigniter correct way to check if libraries/helper/core files is loaded
You can use the native PHP function class_exists() to determine if the class has been defined,before calling it. In same regard, using method_exists() will check if class method exists.
Since helpers are collection of function, not methods, checking can be done using function_exists().
if (class_exists('Library')) { $this->library->myMethod();}For further info please refer to
You don't have to check, you just load them wherever you need to be sure to have them.
Using CI's Load library ($this->load->[library|model|helper]) will always load it just once. You can see this if you turn on your debug logging.
this is codeigniter method to check the loaded libraries.
//If the library is not loaded, Codeigniter will return FALSEif(!$this->load->is_loaded('session')){ $this->load->library('session');}