MySQL: Use utf8mb4 in export only if required

adminer/include/adminer.inc.php

@@ -637,7 +637,7 @@ username.form['auth[driver]'].onchange();
 			if ($style) {
 				dump_csv(array_keys(fields($table)));
 			}
-		} elseif ($style) {
+		} else {
 			if ($is_view == 2) {
 				$fields = array();
 				foreach (fields($table) as $name => $field) {
@@ -647,7 +647,8 @@ username.form['auth[driver]'].onchange();
 			} else {
 				$create = create_sql($table, $_POST["auto_increment"]);
 			}
-			if ($create) {
+			set_utf8mb4($create);
+			if ($style && $create) {
 				if ($style == "DROP+CREATE" || $is_view == 1) {
 					echo "DROP " . ($is_view == 2 ? "VIEW" : "TABLE") . " IF EXISTS " . table($table) . ";\n";
 				}

adminer/include/editing.inc.php

@@ -523,3 +523,15 @@ function db_size($db) {
 	}
 	return format_number($return);
 }
+
+/** Print SET NAMES if utf8mb4 might be needed
+* @param string
+* @return null
+*/
+function set_utf8mb4($create) {
+	static $set = false;
+	if (!$set && preg_match('~\butf8mb4~i', $create)) { // possible false positive
+		$set = true;
+		echo "SET NAMES utf8mb4;\n\n";
+	}
+}

adminer/include/version.inc.php

@@ -1,2 +1,2 @@
 <?php
-$VERSION = "4.2.0";
+$VERSION = "4.2.1-dev";