mysql php query steps

1.mysql connect

$db=new mysqli ('localhost','database','user','password');

2. query

$query=select id from table_name where name='abc';

$query=insert into table_name values("id","info");

3.value

$results=$db->query($query);

$num=$results->num_rows;

for($i=0;$i<$num;$i++){

$result_arr=$results->fetch_assoc();

$value1=$result_arr['id];

}