group concat - How to combine two scripts comparing the date from input and database while it in the for loop PHP -

i have 2 php scripts. 1 script comparing date beween input (from form) , date inside mysql database. other 1 script updating the database while date still empty.

the first script :

$start = $_post['start']; //from input $end = $_post['end']; //from input $d1 = date_create($start);  $d2 = date_create($end); $diff = date_diff($d1, $d2); $days = (int)$diff->format('%a'); for($i=0;$i<=$days;$i++) {     $tgl = date("y-m-d", strtotime("$start +$i day"));     $query = "select group_concat(name separator ', '),count(1) data '$tgl' between start , end";     $result = mysqli_query($connect, $query);     list($name,$jml) = mysqli_fetch_row($result);     mysqli_free_result($result);     if($jml >= 2){         echo "<tr><td align='center'>$tgl</td><td align='left'>$name</td><td align='center'>$jml</td></tr>";     } } 

the second script :

$query="update data set start='$start', end='$end' no = '1'" ; $result = mysqli_query($connect, $query); if($result) {     echo "<script>alert('data ok.') location.replace('form.php')<script>"; } else {     echo "data not ok"; } 

how combine 2 scripts can run in 1 script :

there date 2017-07-01 until 2017-07-10

date 2017-07-04 until 2017-07-07 used other user

a. if input date 2017-07-04 until 2017-07-07 <-- ok, displays table data filtered. not execute update query (second script)

b. if input date 2017-07-01 until 2017-07-05 or 2017-07-06 until 2017-07-10 <-- displays table data filtered don,t execute update query (second script)

c. if input date 2017-07-01 until 2017-07-03 or 2017-07-08 until 2017-07-10 <-- empty (no user use date) execute update query (second script)

thanks answers..