Php database storage problems

I am a little confused about the storage of php databases. I just started learning... $ Query = "insert & nbsp; into & nbsp; movie & nbsp; (rating) & nbsp; values & nbsp; ('$ num3 ')"; $ result = mysql_query ($ query); a separate php database storage problem
I am a little white. I just started learning...
$ Query = "insert into movie (rating) values ('$ num3 ')";
$ Result = mysql_query ($ query );

The result of printing $ num3 is 9.2, but why does it become 0 when it is stored in the database? The field rating is float type
$ Query = "insert into movie (title) values ('$ m [0] [$ I + 5]')"; print $ m [0] [$ I + 5] separately as asdfg
However, the data stored in the database becomes Array [1 + 5. The field title is of the char type.
Is there a problem with my statements? Database php insert query
------ Solution --------------------

$query="insert into movie (rating) values ('".$num3."')";
$query="insert into movie (title) values ('".$m[0][$i+5]."')"; 

------ Solution --------------------
$ Query = "insert into movie (rating) values ('$ num3 ')";
This will not be a problem. you can write
$ Query = "insert into movie (rating) values ($ num3 )";
Look

$ Query = "insert into movie (title) values ('$ m [0] [$ I + 5]')";
Ying writing
$ Query = "insert into movie (title) values ('{$ m [0] [$ I + 5]}')";