Filter array

gistfile1.php

//returns keys and values of $arr if key exist in $keys
function filter_array(array $arr, array $keys){
	$ret = array();

	foreach ( $keys as $k ){
		if (array_key_exists($k,$arr)){
			$ret[$k] = $arr[$k];
		}
	}

	return $ret;
}

/* EXAMPLE:

$arr = array(
"key1" => "val1",
"key2" => "val2",
"key3" => "val3",
"key4" => "val4",
"key5" => "val5",
"key6" => "val6",
"key7" => "val7",
"key8" => "val8",
);

echo "this is the original array:\n<pre>";
print_r($arr);
echo "</pre>\n";

echo "here are the keys (and values) you requested\n<pre>";

$keys = array(
	"key1",
	"key4",
	"key7",
	"key15",
);



print_r(filter_array($arr,$keys));
echo "</pre>";

*/