Write undefined number of form data to MySQL - php

Question

I'm trying now for a while to wrap my head around the following:
I've got a form that submits a user defined number of values to a PHP script and I need to write them into a MySQL database.
The form itself is working fine and print_r() shows my values like this:
[items] => Array
(
[1] => Array
(
[option] => 3
[check_1] => 1
)
[2] => Array
(
[option] => 2
[check_1] => 1
)
[17] => Array
(
[check_1] => 1
[check_3] => 1
)
)
There will be one option value and up to ten checkboxes per item. Now I'd need to end up with something like this to write each item to the DB:
INSERT INTO table (item_id, option, check_1, check_2,...)
VALUES ('$ItemID', '$OptionValue', '$Check_1_Value', '$Check_2_Value',...)
My biggest problem is to read out the Item IDs (1,2 and 17 in this case) and get it into variables.

Answer 1

Help at PHP : foreach.
foreach ( $items as $key => $values )
{
// $key => 17 <= this the values you were looking for
// $values => { [check_1] => 1, [check_3] => 1 }
[...]
}
Init array:
$items = array(
1 => array(
"option" => 3,
"check_1" => 1,
),
2 => array(
"option" => 2,
"check_1" => 1,
),
17 => array(
"check_1" => 1,
"check_3" => 1,
),
) ;
Parse array:
foreach( $items as $k1 => $a1 )
{ // should be escape for safety mysql_real_escape() or ...
$dbCols = "item_id";
$dbValues = $k1;
foreach( $a1 as $k2 => $v2 )
{
$dbCols .= ",$k2";
$dbValues .= ",$v2";
}
echo "INSERT INTO `table` ( $dbCols ) VALUES ( $dbValues );\n";
}
Result:
INSERT INTO `table` ( item_id,option,check_1 ) VALUES ( 1,3,1 );
INSERT INTO `table` ( item_id,option,check_1 ) VALUES ( 2,2,1 );
INSERT INTO `table` ( item_id,check_1,check_3 ) VALUES ( 17,1,1 );