PHP: how to traverse the form and write it into the database

PHP: How do I traverse the form and write it into the database? There is a style: & lt; form & nbsp; action = "" & nbsp; method & nbsp ;=& nbsp; "post" & gt; & lt; ul & gt; & lt; li & gt; & lt; input & nbsp; type = text & nbsp; name = id PHP. how do I traverse the form and write it to the database?
There is a style:

How can I write the values in four IDs into a data table?
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Elder brother, can I leave a contact information (email)? I am very grateful.

I am also a novice qq787574729.