Inserting multiple rows with jQuery, PHP and MySQL using arrays - php

Question

I know this has been asked a million times, but I just can't seem to get it right. I am trying to insert multiple rows at the same time with data sent using jQuery.
I am using AJAX/jQuery to send values like this:
jQuery / AJAX
var extrasids = $('.classextrasid').map(function() {return $(this).val()}).toArray();
var extrasrates = $('.classextrasid').map(function() {return $(this).data('rates')}).toArray();
var extrasquantities = $('.classextrasid').map(function() {return $(this).data('quantity')}).toArray();
$.ajax({
type: "POST",
url: "modules/addsinglebooking.php",
dataType: 'json',
data: {extrasids:extrasids,extrasrates:extrasrates,extrasquantities:extrasquantities},
cache: false,
})
My PHP looks like this:
PHP
<?php
session_start();
$inputvalues = $_POST;
$errors = false;
$returnResult;
$result = false;
include_once '../../includes/database.php';
$extraids = $inputvalues['extrasids'];
$extrarates = $inputvalues['extrasrates'];
$extraquantities = $inputvalues['extrasquantities'];
if( !$errors ) {
foreach($extraids as $extraid){
$stmt = $mysqli->prepare("INSERT INTO `extras`(`extraid`,`extrarate`,`extraquantity`) values (?,?,?)");
$stmt->bind_param('sss', $extraid,$extrarates,$extraquantities);
if(!$stmt->execute()) echo $stmt->error;
}
$result = $stmt->get_result();
$returnResult = "Success";
}
mysqli_close($mysqli);
echo json_encode(['result' => $returnResult, 'errors' => $errors]);
exit;
?>
My problem:
If my values looked like this, my above code would work:
extraid extrarates extraquantity
---------------------------------------
1 rate1 quantity1
2 rate1 quantity1
3 rate1 quantity1
but all values are different like this:
extraid extrarates extraquantity
---------------------------------------
1 rate1 quantity1
2 rate2 quantity2
3 rate3 quantity3
So I only to loop through one array and add multiple records if the rest of the values are the same and only one value is different.
How can I loop through everything to add 3 multiple rows which are unique?

Answer 1

In your foreach you can add this:
$i = 0;
foreach($extraids as $extraid){
$stmt = $mysqli->prepare("INSERT INTO `extras`(`extraid`,`extrarate`,`extraquantity`) values (?,?,?)");
$stmt->bind_param('sss', $extraid,$extrarates[$i++],$extraquantities[$i++]);
if(!$stmt->execute()) echo $stmt->error;
}
So first setting $i to 0 and then in the loop increment it with each time it repeats