added mysql dump utf8mb4

pty_mysql_backup_all_table.php

@@ -59,7 +59,7 @@ echo "finished\n";
 
 function mysql_backup($host, $user, $password, $dbName, $tableName)
 {
-    $cmd = "mysqldump -u $user -p$password -h $host $dbName $tableName --add-drop-table --add-drop-database --complete-insert --extended-insert=FALSE --single-transaction > pty_mysql_backup_all_table_{$dbName}.{$tableName}.sql";
+    $cmd = "mysqldump -u $user -p$password -h $host $dbName $tableName --default-character-set=utf8mb4 --add-drop-table --add-drop-database --complete-insert --extended-insert=FALSE --single-transaction > pty_mysql_backup_all_table_{$dbName}.{$tableName}.sql";
     echo "{$cmd}\n";
 
     system($cmd);