<?php

 class MyIterator implements Iterator{  private $var = array();  public function __construct($array)  {    echo "constructing
";    if (is_array($array)) {        $this->var = $array;    }  }  public function rewind() {    echo "rewinding
";    reset($this->var);  }  public function current() {    $var = current($this->var);    echo "current: $var
";    return $var;  }  public function key() {    $var = key($this->var);    echo "key: $var
";    return $var;  }  public function next() {    $var = next($this->var);    echo "next: $var
";    return $var;  }  public function valid() {    $var = $this->current() !== false;    echo "valid: {$var}
";    return $var;  }}$values = array(1,2,3);$it = new MyIterator($values);foreach ($it as $a => $b) {  print "$a: $b
";}$itp = "it";foreach ($$itp as $a => $b) {  print "$a: $b
";}function getIter() {  $values = array(1,2,3);  $it = new MyIterator($values);  return $it;}foreach (getIter() as $a => $b) {  print "$a: $b
";}class MyIteratorAggregate implements IteratorAggregate {  public function getIterator() {    return getIter();  }}$obj = new MyIteratorAggregate();foreach ($obj as $a => $b) {  print "$a: $b
";}