PHP Iterate through $_POST and use values by name

Question

I have a form that contains a number of fields with names item1, item2, item13, item43 etc, each time those fields are different because they are populated in the form with AJAX

Answer 1

Loop through $_POST and see if the key contains 'item'.

foreach($_POST as $key=>$value){
    if(preg_match('/item(\d*)/', $key, $match) === 1){
        inserttag($value, $match[1]);
    }
}