<?php/*** Example : rewind();*/$arr = new SplFixedArray(5);$a = $arr->key(); //Zero'th indexvar_dump($a);echo "<br>";$arr->next(); // Shift to first index$a = $arr->key(); var_dump($a);echo "<br>";$arr->next(); // Shift to second index$a = $arr->key();var_dump($a);echo "<br>";$arr->next(); // Shift to third index$a = $arr->key();var_dump($a);echo "<br>";?>The above example will output:int(0) int(1) int(2) int(3)