The Iterator interface (original) (raw)

This example demonstrates in which order methods are called when using foreach with an iterator.

`<?php
class myIterator implements Iterator {
private $position = 0;
private $array = array(
"firstelement",
"secondelement",
"lastelement",
);

public function

__construct() {
$this->position = 0;
}

public function

rewind() {
var_dump(METHOD);
$this->position = 0;
}

public function

current() {
var_dump(METHOD);
return this−>array[this->array[this−>array[this->position];
}

public function

key() {
var_dump(METHOD);
return $this->position;
}

public function

next() {
var_dump(METHOD);
++$this->position;
}

public function

valid() {
var_dump(METHOD);
return isset($this->array[$this->position]);
}
}$it = new myIterator;

foreach( itasit as itaskey => $value) {
var_dump($key, $value);
echo "\n";
}
?> `

string(18) "myIterator::rewind" string(17) "myIterator::valid" string(19) "myIterator::current" string(15) "myIterator::key" int(0) string(12) "firstelement"

string(16) "myIterator::next" string(17) "myIterator::valid" string(19) "myIterator::current" string(15) "myIterator::key" int(1) string(13) "secondelement"

string(16) "myIterator::next" string(17) "myIterator::valid" string(19) "myIterator::current" string(15) "myIterator::key" int(2) string(11) "lastelement"

string(16) "myIterator::next" string(17) "myIterator::valid"