diff --git a/adminer/include/adminer.inc.php b/adminer/include/adminer.inc.php
index 9a0f08b1..02d4f584 100644
--- a/adminer/include/adminer.inc.php
+++ b/adminer/include/adminer.inc.php
@@ -166,6 +166,33 @@ function adminer_edit_input($table, $field) {
 	return call_adminer('edit_input', false, $table, $field);
 }
 
+/** Process sent input
+* @param string field name
+* @param array single field from fields()
+* @return string expression to use in a query
+*/
+function adminer_process_input($name, $field) {
+	global $dbh;
+	$idf = bracket_escape($name);
+	$function = $_POST["function"][$idf];
+	$value = $_POST["fields"][$idf];
+	$return = $dbh->quote($value);
+	if (ereg('^(now|uuid)$', $function)) {
+		$return = "$function()";
+	} elseif (ereg('^[+-]$', $function)) {
+		$return = idf_escape($name) . " $function $return";
+	} elseif (ereg('^[+-] interval$', $function)) {
+		$return = idf_escape($name) . " $function " . (preg_match("~^([0-9]+|'[0-9.: -]') [A-Z_]+$~i", $value) ? $value : $return);
+	} elseif (ereg('^(addtime|subtime)$', $function)) {
+		$return = "$function(" . idf_escape($name) . ", $return)";
+	} elseif (ereg('^(md5|sha1|password)$', $function)) {
+		$return = "$function($return)";
+	} elseif (ereg('date|time', $field["type"]) && $value == "CURRENT_TIMESTAMP") {
+		$return = $value;
+	}
+	return call_adminer('process_input', $return, $name, $field);
+}
+
 /** Prints navigation after Adminer title
 * @param string can be "auth" if there is no database connection or "db" if there is no database selected
 * @return bool true if default navigation should be printed
diff --git a/adminer/include/functions.inc.php b/adminer/include/functions.inc.php
index 153fa60a..67760468 100644
--- a/adminer/include/functions.inc.php
+++ b/adminer/include/functions.inc.php
@@ -339,20 +339,8 @@ function process_input($name, $field) {
 			return false; //! report errors
 		}
 		return "_binary" . $dbh->quote($file);
-	} elseif (ereg('^(now|uuid)$', $function)) {
-		return "$function()";
-	} elseif (ereg('^[+-]$', $function)) {
-		return idf_escape($name) . " $function " . $dbh->quote($value);
-	} elseif (ereg('^[+-] interval$', $function)) {
-		return idf_escape($name) . " $function " . (preg_match("~^([0-9]+|'[0-9.: -]') [A-Z_]+$~i", $value) ? $value : $dbh->quote($value));
-	} elseif (ereg('^(addtime|subtime)$', $function)) {
-		return "$function(" . idf_escape($name) . ", " . $dbh->quote($value) . ")";
-	} elseif (ereg('^(md5|sha1|password)$', $function)) {
-		return "$function(" . $dbh->quote($value) . ")";
-	} elseif ($field["type"] == "timestamp" && $value == "CURRENT_TIMESTAMP") {
-		return $value;
 	} else {
-		return $dbh->quote($value);
+		return adminer_process_input($name, $field);
 	}
 }
 
diff --git a/editor/include/adminer.inc.php b/editor/include/adminer.inc.php
index 27f75fe2..b9ae9c3d 100644
--- a/editor/include/adminer.inc.php
+++ b/editor/include/adminer.inc.php
@@ -146,6 +146,25 @@ function adminer_edit_input($table, $field) {
 	return call_adminer('edit_input', $return, $table, $field);
 }
 
+/** Process sent input
+* @param string field name
+* @param array single field from fields()
+* @return string expression to use in a query
+*/
+function adminer_process_input($name, $field) {
+	global $dbh;
+	$idf = bracket_escape($name);
+	$function = $_POST["function"][$idf];
+	$value = $_POST["fields"][$idf];
+	$return = $dbh->quote($value);
+	if (!ereg('varchar|text', $field["type"]) && !strlen($value)) {
+		$return = "NULL";
+	} elseif (ereg('date|time', $field["type"]) && $value == "CURRENT_TIMESTAMP") {
+		$return = $value;
+	}
+	return call_adminer('process_input', $return, $name, $field);
+}
+
 function adminer_navigation($missing) {
 	global $SELF;
 	if (call_adminer('navigation', true, $missing) && $missing != "auth") {