The SeekableIterator interface

(PHP 5 >= 5.1.0, PHP 7, PHP 8)

Introduzione

The Seekable iterator.

Sommario dell'interfaccia

interface SeekableIterator extends Iterator {
/* Metodi */
public seek(int $offset): void
/* Metodi ereditati */
}

Esempi

Example #1 Basic usage

This example demonstrates creating a custom SeekableIterator, seeking to a position and handling an invalid position.

<?php
class MySeekableIterator implements SeekableIterator {

private
$position;

private
$array = array(
"first element",
"second element",
"third element",
"fourth element"
);

/* Method required for SeekableIterator interface */

public function seek($position) {
if (!isset(
$this->array[$position])) {
throw new
OutOfBoundsException("invalid seek position ($position)");
}

$this->position = $position;
}

/* Methods required for Iterator interface */

public function rewind() {
$this->position = 0;
}

public function
current() {
return
$this->array[$this->position];
}

public function
key() {
return
$this->position;
}

public function
next() {
++
$this->position;
}

public function
valid() {
return isset(
$this->array[$this->position]);
}
}

try {

$it = new MySeekableIterator;
echo
$it->current(), "\n";

$it->seek(2);
echo
$it->current(), "\n";

$it->seek(1);
echo
$it->current(), "\n";

$it->seek(10);

} catch (
OutOfBoundsException $e) {
echo
$e->getMessage();
}
?>

Il precedente esempio visualizzerà qualcosa simile a:

first element
third element
second element
invalid seek position (10)

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