Array Rotation

PHP
1

Is there a more concise way of rotating an array leftwards X times than this?


for($i = 0; $i < $x; $i++) {
  array_push($array,array_shift($array));
}
2 

$a=array_merge(array_slice($a,$x), array_slice($a,0,$x));

It’s better readable (IMHO), but slightly slower.


set_time_limit(0);
class Stopwatch
{
	private $_starttime;
	function __construct() {}

	public function start()
	{
		$mtime = microtime();
		list($usec, $sec) = split(' ', $mtime);
		$this->_starttime = (float)$usec + (float)$sec;
	}

	public function stop()
	{
		$mtime = microtime();
		list($usec, $sec) = split(' ', $mtime);
		return (((float)$usec + (float)$sec) - (float)$this->_starttime);
	}
}

$s=new StopWatch;
$x=2;

$s->start();
for ($j=0;$j<100000;$j++) {
	$a=array(1,2,3,4,5);
	$a=array_merge(array_slice($a,$x), array_slice($a,0,$x));
}
echo 'Method 1: ', $s->stop(), "\
";

$s->start();
for ($j=0;$j<100000;$j++) {
	$a=array(1,2,3,4,5);
	for ($i=0; $i<$x; $i++) {
		array_push($a,array_shift($a));
	}
}
echo 'Method 2: ', $s->stop(), "\
";
/*
Method 1: 0.32495498657227
Method 2: 0.22844004631042
*/