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Hi,
I am an NT MCSE who has decided to abandon the MSCE Win2K path and take the UNIX/Linux Path.
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SEEKABLEITERATOR(3) 1 SEEKABLEITERATOR(3)
The SeekableIterator interface
INTRODUCTION
The Seekable iterator.
INTERFACE SYNOPSIS
SeekableIterator
SeekableIteratorextends
Iterator
Methods
o abstractpublic void SeekableIterator::seek (int $position)
Inherited methods
o abstractpublic mixed Iterator::current (void )
o abstractpublic scalar Iterator::key (void )
o abstractpublic void Iterator::next (void )
o abstractpublic void Iterator::rewind (void )
o abstractpublic boolean Iterator::valid (void )
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(), "
";
$it->seek(2);
echo $it->current(), "
";
$it->seek(1);
echo $it->current(), "
";
$it->seek(10);
} catch (OutOfBoundsException $e) {
echo $e->getMessage();
}
?>
The above example will output something similar to:
first element
third element
second element
invalid seek position(10)
PHP Documentation Group SEEKABLEITERATOR(3)
