Mysql database problems. what does this statement mean?

Mysql database problems. what does this statement mean?

$ Query = "select orderid from orders where customerid = $ customerid and amount> ". $ _ SESSION ['total _ price']. "-. 001 and // What does this sentence mean? Amount <". $ _ SESSION ['total _ price']." +. 001 and // What does this mean? Date = '$ date' and order_status = 'partial' and ship_name = '$ ship_name' and ship_address = '$ ship_address' and ship_city = '$ ship_city' and ship_state = '$ ship_state' and ship_zip = '$ ship_zip' and ship_country = '$ ship_country '";

Reply to discussion (solution)

The value of total_price fluctuates up or down by 0.001.

In PHP breakpoint debugging, check the actual content of $ query.

In PHP breakpoint debugging, check the actual content of $ query.

How can I perform breakpoint debugging? Can I debug C/C ++ or PHP ?? Please advise. What is it about floating up or down?