Description:
------------
Sorry if I did something wrong. This is my first time I submit a report. (Btw: when adding a note, the link "Click here to request a feature." redirects to bugs.php.net, is this correct?)

I was looking for a function that deletes either integer keys or string keys (needed for my caching).
As I didn't find a function I created a simple one.

<?php

function array_extract($array, $extract_type = 1)
{
	foreach ( $array as $key => $value )
	{
		if ( $extract_type == 1 && is_string($key) )
		{
			// delete string keys
			unset($array[$key]);
		}
		elseif ( $extract_type == 2 && is_int($key) )
		{
			// delete integer keys
			unset($array[$key]);
		}
	}

	return $array;
}

?>

You can of course define constants to have a nicer look, I have chosen these: EXTR_INT = 1; EXTR_STRING = 2
EXTR_INT will return an array where keys are only integer while
EXTR_STRING will return an array where keys are only string

I hope you find it useful.