<?php $a = [0,1,2,null,3]; foreach($a as $k => $v){ echo $v; } echo "\n"; class Test implements Iterator { private $p = 0; private $a = [0,1,2,null,3]; public function __construct() { array_unshift( $this->a, 8 ); } function rewind() { $this->p = 0; } function current() { return $this->a[$this->p]; } function key() { return $this->p; } function next() { ++$this->p; } function valid() { return isset( $this->a[$this->p] ); } } $it = new Test; foreach($it as $k => $v) { echo $v; } ?>
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