added filter_keys

1 files changed, 16 insertions, 0 deletions

diff --git a/it.class b/it.class
index 1dad9d7..459691e 100644
--- a/it.class
+++ b/it.class
@@ -256,6 +256,22 @@ function replace($replacements, $string, $p = array())
 	return $result;
 }
 
+/**
+ * Extract key => value pairs from assoc array by key
+ * @param $array array to filter
+ * @param $keys array of keys to keep
+ */
+function filter_keys($array, $keys)
+{
+	$result = array();
+	$keep = array_flip($keys);
+
+	foreach ($array as $key => $val)
+		if (isset($keep[$key]))
+			$result[$key] = $val;
+
+	return $result;
 }
 
+}
 ?>