diff --git a/inc/wp-helper-functions.php b/inc/wp-helper-functions.php
index c8f4163..fe27584 100644
--- a/inc/wp-helper-functions.php
+++ b/inc/wp-helper-functions.php
@@ -108,3 +108,12 @@ function wp_validate_boolean($var)
     }
 }
 
+if ( ! function_exists('wp_slash')) {
+    function wp_slash($value)
+    {
+        if (is_array($value)) {
+            return array_map('wp_slash', $value);
+        }
+        return is_string($value) ? addslashes($value) : $value;
+    }
+}