note 115704 added to language.oop5.abstract

Please note order or positioning of the classes in your code can affect the interpreter and can cause a Fatal error: Class 'YourClass' not found if there are multiple levels of abstraction out of order. For example: <?php abstract class horse extends animal { public function get_breed() { return "Jersey"; } } class cart extends horse { public function get_breed() { return "Wood"; } } abstract class animal { public abstract function get_breed(); } $cart = new cart(); print($cart->get_breed()); ?> this outputs: Wood However, if you put the cart before the abstract horse (literally): <?php class cart extends horse { public function get_breed() { return "Wood"; } } abstract class horse extends animal { public function get_breed() { return "Jersey"; } } abstract class animal { public abstract function get_breed(); } $cart = new cart(); print($cart->get_breed()); ?> this throws an error: Fatal error: Class 'horse' not found So, when using multiple levels of abstraction, be careful of the positioning of the classes within the source code - and don't put the cart before the abstract horse. ---- Server IP: 72.52.91.14 Probable Submitter: 73.33.242.72 ---- Manual Page -- http://php.net/manual/en/language.oop5.abstract.php Edit -- https://master.php.net/note/edit/115704 Del: integrated -- https://master.php.net/note/delete/115704/integrated Del: useless -- https://master.php.net/note/delete/115704/useless Del: bad code -- https://master.php.net/note/delete/115704/bad+code Del: spam -- https://master.php.net/note/delete/115704/spam Del: non-english -- https://master.php.net/note/delete/115704/non-english Del: in docs -- https://master.php.net/note/delete/115704/in+docs Del: other reasons-- https://master.php.net/note/delete/115704 Reject -- https://master.php.net/note/reject/115704 Search -- https://master.php.net/manage/user-notes.php