ArrayIterator::seek

<?php// didn't see any code demos...here's one from an app I'm working on$array = array('1' => 'one',               '2' => 'two',               '3' => 'three');$arrayobject = new ArrayObject($array);$iterator = $arrayobject->getIterator();if($iterator->valid()){    $iterator->seek(1);            // expected: two, output: two    echo $iterator->current();    // two}?>

<?php//seek alter the iterator's internal indice instead of the value that key() returns. //This is a big trap if combining with uasort/natsort function. $a = new ArrayObject([4,3,2,1]);$it = $a->getIterator();$it->natsort();   //The Iterator preserve the key while sorting the array $it->rewind();$first = $it->key();   //The first element is  1 and it's key is 3echo $first. PHP_EOL;  // 3$it->next();$second = $it->key();echo $second. PHP_EOL; //2$it->next();$it->seek($first);             //Was intended to seek to element 1, key 3, indice 0echo  $it->key() . PHP_EOL; //end up 0 because seek took parameter as indice instead of key. It seek to element indice 3, element 4 key 0.var_dump($it);/* Output: 320object(ArrayIterator)#2 (1) {  ["storage":"ArrayIterator":private]=>  object(ArrayObject)#1 (1) {    ["storage":"ArrayObject":private]=>    array(4) {      [3]=>      int(1)      [2]=>      int(2)      [1]=>      int(3)      [0]=>      int(4)    }  }}*/