mysqlautobackup
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$dbh = mysql_connect('mysql_host:3306','username','password'); mysql_select_db('database'); $query = "SELECT * FROM users_table WHERE username='$username'"; $res = mysql_query($query, $dbh); $rows = mysql_num_rows($res); if ($rows > 0) { echo 'Error!'; } else { // continue to add the user } mysql_close($dbh);