Description:
------------
php-cli is not freeing up memory of an array. I am haveing this problem on a large scale and is makeing php take up 40mbs+.

Iv tryed unsetting each value independly. It still had the same problem.
Also this same thing seems to be happening to foreach. 


Reproduce code:
---------------
<?
		$test_array = Array();
		$pid = getmypid();
		$loop = 2000;
		echo "Starting Memory:\n";
		echo "USAGE (% KB PID ): " .`ps -eo%mem,rss,pid | grep $pid` . "\n";
		for($i=0;$loop > $i;$i++){
			$test_array[] = str_repeat("test", 5000);
		}
		echo "Finished Loop:\n";
		echo "USAGE (% KB PID ): " .`ps -eo%mem,rss,pid | grep $pid` . "\n";
		unset($test_array);
		echo "Cleaned Up:\n";
		echo "USAGE (% KB PID ): " .`ps -eo%mem,rss,pid | grep $pid` . "\n";
?>

Expected result:
----------------
Starting Memory:
USAGE (% KB PID ):  0.1 3592 14473

Finished Loop:
USAGE (% KB PID ):  1.3 42880 14473

Cleaned Up:
USAGE (% KB PID ):  1.3 3592 14473


Actual result:
--------------
Starting Memory:
USAGE (% KB PID ):  0.1 3592 14473

Finished Loop:
USAGE (% KB PID ):  1.3 42880 14473

Cleaned Up:
USAGE (% KB PID ):  1.3 42880 14473