note 117287 added to class.spldoublylinkedlist

/* php doubly link list is an amazing data structure ,doubly means you can traverse forward as well as backward, it can act as a deque(double ended queue) if you want it to, here is how it works */ //instantiating an object of doubly link list $dlist=new SplDoublyLinkedList(); //a push inserts data at the end of the list $dlist->push('hiramariam'); $dlist->push('maaz'); $dlist->push('zafar'); /* the list contains hiramariam maaz zafar */ //while an unshift inserts an object at top of the list $dlist->unshift(1); $dlist->unshift(2); $dlist->unshift(3); /* the list now contains 3 2 1 hiramariam maaz zafar */ //you can delete an item from the bottom of the list by using pop $dlist->pop(); /* the list now contains 3 2 1 hiramariam maaz */ //you can delete an item from the top of the list by using shift() $dlist->shift(); /* the list now contains 2 1 hiramariam maaz */ /* if you want to replace an item at particular index you can use a method named add , note that if you want to replace an item that does not exist , an exception will be thrown*/ $dlist->add(3 , 2.24); /* to go through the list we use a simple for loop, the rewind() method shown below point to the initials of the list depending on the iterator, a valid() method checks whether a list is still valid or not , meaning it ensures the loop does not go on and on after we reach the last data in the list , and the next() method simply points to the next data in the list. */ for($dlist->rewind();$dlist->valid();$dlist->next()){ echo $dlist->current()."<br/>"; } echo "<br/>"; /* To traverse backward */ $dlist->setIteratorMode(SplDoublyLinkedList::IT_MODE_LIFO); for($dlist->rewind();$dlist->valid();$dlist->next()){ echo $dlist->current()."<br/>";; } ---- Server IP: 72.52.91.14 Probable Submitter: 45.114.122.199 ---- Manual Page -- http://php.net/manual/en/class.spldoublylinkedlist.php Edit -- https://master.php.net/note/edit/117287 Del: integrated -- https://master.php.net/note/delete/117287/integrated Del: useless -- https://master.php.net/note/delete/117287/useless Del: bad code -- https://master.php.net/note/delete/117287/bad+code Del: spam -- https://master.php.net/note/delete/117287/spam Del: non-english -- https://master.php.net/note/delete/117287/non-english Del: in docs -- https://master.php.net/note/delete/117287/in+docs Del: other reasons-- https://master.php.net/note/delete/117287 Reject -- https://master.php.net/note/reject/117287 Search -- https://master.php.net/manage/user-notes.php