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<?php include("config.php");// I'm assuming that dropdown 1_1 is the first one, 1_2 is the second one and so on.// subcat_1_1_1 is the first checkbox in the first dropdown in the first of the three sections.// subcat_1_1_2 is the second checkbox in that dropdown and so on. $categories = array();$_POST['name'] = $name;$_POST['green'] = $green;$_POST['eco'] = $eco;$_POST['dfe'] = $dfe;  // Just a little trick to make multiple variables on a single line$section_exists = $category_exists = $subcategory_exists = true; // While the array-key exists, this loop will run and collect all checkboxes// in the array called categories for($w=1;$section_exists==true;$w++){        if($!array_key_exists('subcat_'.$w.'_1_1', $_POST)        {                $section_exists = false;        }               for($x=1;$category_exists==true;$x++)        {                if($!array_key_exists('subcat_1_'.$x.'_1', $_POST)                {                        $category_exists = false;                }                       for($y=1;$subcategory_exists==true;$y++)                {                        if(!array_key_exists('subcat_1_'.$x.'_'.$y, $_POST)                        {                                       $exists=false;                        }                        if($POST['subcat_1_'.$x.'_'.$y] == 'checked')                        {                                $categories[$w][$x][] = $i;                        }                }        }} // Now you have an array with all checkboxes, something like// $subcat[1][1][1] = The number of the first checked checkbox in the first category// $subcat[1][1][2] = The number of the second checked checkbox  in the first category and so on.// $subcat[1][2][1] = The number of the first checked checkbox in the second category// $subcat[1][2][2] = The number of the second checked checkbox in the second category and so on.// $subcat[2][1][1] = The number of the first checked checkbox in the first category, second section// $subcat[2][1][2] = The number of the second checked checkbox  in the first category, second section and so on. $key_exists = true;$subkey_exists = true;$strings = array();// Loops through and turns all categories' arrays into strings for($h=1;$key_exists==true;$h++){        if(!array_key_exists('['.$h.'][1]', $categories)        {                $key_exists = false;        }               for($i=1;$subkey_exists==true;$i++)        {                if(!array_key_exists('['.$h.']['.$i.']', $categories)                {                        $subkey_exists = false;                }								print(sizeof($strings));				                // This will turn the array into a string with all subcategories, separated by ;.                // For example, 0;3;53 if subcategory 0, 3 and 53 are checked                $strings[$h][$i] = implode(';', $categories[$h][$i]);        }} // Now strings[] contains all the strings (like 1;3;5 and 3;5;7). Loop through the array:for($x=1;$x<sizeof($strings);$x++){        for($y=1;$y<sizeof($strings[$x]);$y++)        {                // *build a query using the string*                // Echoing just for debugging or whatever.               print("INSERT into item ('', 'name','green,'eco','dfe','cattag_1', 'subtag_1') VALUES ('".$name.",".$green.",".$eco.",".$dfe.",".$x.", ".$y.")");        }} // Done. // Store that field in the DB and then when you want them into an array again, do:// $array = exlode(';', $string); ?>