diff --git a/verify.php b/verify.php
new file mode 100644
index 0000000..d38f8d1
--- /dev/null
+++ b/verify.php
@@ -0,0 +1,63 @@
+<?php
+/** DomDNS
+    @package domdns
+    @author Dominique Fournier <dominique@fournier38.fr> */
+
+/** Permit to check the validity of fields */
+class verify
+{
+  /////////////////
+  //   NETWORK   //
+  /////////////////
+  /** Check if $val is a valid IPv4
+      Return TRUE or FALSE */
+  public function is_ipv4 ($val)
+  {
+    if (filter_var ($val, FILTER_VALIDATE_IP, FILTER_FLAG_IPV4))
+      return TRUE;
+    return FALSE;
+  }
+
+  /** Check if $val is a valid IPv6
+      Return TRUE or FALSE */
+  public function is_ipv6 ($val)
+  {
+    if (filter_var ($val, FILTER_VALIDATE_IP, FILTER_FLAG_IPV6))
+      return TRUE;
+    return FALSE;
+  }
+
+  ///////////////
+  //   DATES   //
+  ///////////////
+  /** Check if $val is a valid date
+      A valid date is 2014-03-20 12:27:34
+      Return TRUE or FALSE */
+  public function is_datetimeSQL ($val)
+  {
+    if (strlen ($val) !== 19)
+      return FALSE;
+    $arr = date_parse ($val);
+    if ($arr["warning_count"] !==0)
+      return FALSE;
+    if ($arr["error_count"] !==0)
+      return FALSE;
+    if (isset ($arr["tz_abbr"]))
+      return FALSE;
+    if (strspn ($val, "0123456789 :-") !== strlen ($val))
+      return FALSE;
+    return TRUE;
+  }
+
+  /////////////////
+  //   NUMBERS   //
+  /////////////////
+  /** Return TRUE if the provided value is an integer in decimal (not octal) */
+  public function is_integer ($val)
+  {
+    if (strspn ($val, "0123456789") !== strlen ($val))
+      return FALSE;
+    return TRUE;
+    
+  }
+}