"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;
}