"parhamtvk", 'age'=> 20 , 'sex' => 'm', 'issingle'=> 0 ); $sqll = "insert into people(fullname,age,sex,issingle) values( '{$userdata['fullname']}',{$userdata['age']},'{$userdata['sex']}',{$userdata['issingle']})"; if($mysqli->query($sqll)){ echo "insert data is succsesfully" .PHP_EOL; }else{ echo "cannot add user ($mysqli->error )" .PHP_EOL; }