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<?php
namespace itertools;
use Iterator;
/**
* Iterator equivalent of [array_unique](http://be1.php.net/manual/en/function.array-unique.php)
* but only works for sorted input.
* Example:
* Iterator equivalent of [range](http://be1.php.net/manual/en/function.range.php).
* $lines = new SliceIterator(new FileLineIterator('file.txt'), 0, 1000); // will iterate the first 1000 lines of the file
*/
class RangeIterator implements Iterator
{
protected $start;
protected $end;
protected $step;
protected $currentValue;
protected $iterationCount;
public function __construct($start, $end = null, $step = 1)
if(null === $end) {
$end = $step > 0 ? INF : -INF;
}
$this->start = $start;
$this->end = $end;
$this->step = $step;
public function rewind()
$this->currentValue = $this->start;
$this->iterationCount = 0;
public function key()
return $this->iterationCount++;
public function current()
return $this->currentValue;
public function next()
$this->currentValue += $this->step;
public function valid()
if($this->step > 0) {
return $this->currentValue <= $this->end;
} else if($this->step < 0) {
return $this->currentValue >= $this->end;
return true;
SuRaMoN /
itertools
