for James

clean_arrays.php

<?php

$test = array('a', 'b', 'c');

function clean($input) 
{
	$output = $input . '!';
	return $output;
}

$clean = array();

foreach ($test as $key => $value) {
	$clean[$key] = clean($test[$key]);
}

print_r($clean);

/**
 * returns Array ( [0] => a! [1] => b! [2] => c! )
 */

?>